Oleg Antipov, Leading scientist, Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov Street, 603950 Nizhniy Novgorod, Russian Federation Office: 78314164947
Spatio-temporal instability of fundamental mode in Yb3+-doped large mode area polarization-mainta... more Spatio-temporal instability of fundamental mode in Yb3+-doped large mode area polarization-maintaining fiber amplifiers was analyzed. Limitations of the amplifier output power and gain were investigated depending on the input signal parameters: spectral width, power level and polarization. The influence of backward reflection of the optical waves on the mode-instability threshold was also examined. The traveling electronic and thermal refractive index gratings following the optically-induced population gratings were found to provide the energy transfer from the main mode to the higher-order modes.
ABSTRACT Experimental and theoretical investigations were made of self-diffraction of CO2 laser r... more ABSTRACT Experimental and theoretical investigations were made of self-diffraction of CO2 laser radiation in absorbing nematic crystals. A considerable increase in the signal-wave gain occurred as a result of transfer of energy from the pump radiation near a nematic-isotropic liquid phase transition (in this case the absolute gain of a weak infrared wave reached 600%). A theoretical interpretation of the effect was based on a model of a thermal nonlinearity of a nematic liquid crystal near the phase transition. Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts: Use: Authors Title Abstract Text Return: Query Results Return items starting with number Query Form Database: Astronomy Physics arXiv e-prints
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2011
Abstract Rare-earth-doped optical fibers are considered as possible candidates for air and space ... more Abstract Rare-earth-doped optical fibers are considered as possible candidates for air and space applications such as optical sensors and optical inter-satellite telecommunication links. The use of Yb-doped optical fibers on the satellite board emerges the challenge of ...
Spatio-temporal instability of the fundamental mode in Yb<sup>3+</sup>-doped few-mode... more Spatio-temporal instability of the fundamental mode in Yb<sup>3+</sup>-doped few-mode PM fiber amplifiers with a core diameter of 8.5 μm was registered at 2-30 Watts pump power. Both experimental and theoretical analysis revealed the nonlinear power transformation of the LP<sub>01</sub> fundamental mode into high-order modes. Numerical simulation revealed self-consistent growth of the higher-order mode and traveling electronic index grating accompanying the population grating induced by the mode interference field (due to different polarizability of the excited and unexcited Yb<sup>3+</sup> ions). Experimental results and numerical calculations showed the increase of the instability threshold along with an increase of the signal frequency bandwidth.
A proof-of-principle study of a 1.97-µm Tm:Lu 2 O 3 ceramic disk laser, intracavity pumped by a 1... more A proof-of-principle study of a 1.97-µm Tm:Lu 2 O 3 ceramic disk laser, intracavity pumped by a 1.2-µm semiconductor disk laser, is presented. The demonstrated concept allows for improved pump absorption and takes advantage of the broad wavelength coverage provided by semiconductor disk laser technology. For thin disk lasers the small thickness of the gain element typically leads to inefficient pump light absorption. This problem is usually solved by using a complex multi-pass pump arrangement. In this study we address this challenge with a new laser concept of an intracavity pumped ceramic thin disk laser. The output power at 1.97 µm was limited to 250 mW due to heat spreader-less mounting scheme of the ceramic gain disk.
form only given. High-power ultrashort-pulse lasers that operate around 2μm spectral region are o... more form only given. High-power ultrashort-pulse lasers that operate around 2μm spectral region are of particular interest in expanding access to broadband coherent source options for the mid-infrared spectral region. For example, such optical frequency comb generators can be utilized for real-time, high-sensitivity and high-resolution detection of absorption features of molecular species present in the so-called “molecular fingerprint” region. Amongst other potential implementations of 2-μm ultrafast lasers are free-space optical communications, high-harmonic generation, infrared pulsed laser ablation of polymer materials and surgery. Tm-doped crystalline gain media could offer an attractive route towards the development of high-power and efficient ultrashort-pulse lasers for the 2-μm spectral region as alternatives to fiber [1] or semiconductor thin disk laser [2] approaches for which only rather limited average powers have been reported to date. For such purposes, Tm-doped crystals h...
ABSTRACT We demonstrate the first Tm-doped Lu2O3 ceramic laser utilizing disk geometry in the des... more ABSTRACT We demonstrate the first Tm-doped Lu2O3 ceramic laser utilizing disk geometry in the design of the active element. The ceramic 2-µm disk laser is pumped within the high-Q cavity of a 1.2-µm semiconductor disk laser.
An influence of backward reflection on spatio-temporal instability of the fundamental mode in Yb&... more An influence of backward reflection on spatio-temporal instability of the fundamental mode in Yb&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;sup&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;3+&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/sup&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;-doped few-mode polarization maintaining fiber amplifiers with a core diameter of 10 μm was studied experimentally and theoretically. The mode instability threshold was registered to decrease dramatically in the presence of a backward reflection of the signal from the output fiber end; an increase of the signal bandwidth or input power resulted in the increase of the threshold. Numerical simulation revealed a self-consistent growth of the higher-order mode LP&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;11&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; and a traveling index grating accompanying the population grating induced by the mode interference field (due to different polarizability of the excited and unexcited Yb&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;sup&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;3+&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/sup&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; ions). The presence of the backward-propagating wave resulted in four-wave mixing on the common index grating induced by the interference field of pairs of the fundamental LP&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;01&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; and LP&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;11&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; modes.
Spatio-temporal instability of the fundamental mode in Yb 3+-doped few-mode PM fiber amplifiers w... more Spatio-temporal instability of the fundamental mode in Yb 3+-doped few-mode PM fiber amplifiers with a core diameter of 8.5 μm was registered at 2-30 Watts pump power. Both experimental and theoretical analysis revealed the nonlinear power transformation of the LP 01 fundamental mode into high-order modes. Numerical simulation revealed self-consistent growth of the higher-order mode and traveling electronic index grating accompanying the population grating induced by the mode interference field (due to different polarizability of the excited and unexcited Yb 3+ ions). Experimental results and numerical calculations showed the increase of the instability threshold along with an increase of the signal frequency bandwidth.
We discuss a radioactivity sensing based on monitoring of color centers formation in Yb-doped fib... more We discuss a radioactivity sensing based on monitoring of color centers formation in Yb-doped fiber under gamma irradiation. New method exploits the dynamic effect of refractive index changes (RIC) induced by laser pumping into the fiber absorption band. In our experiment four identical samples of the single-mode aluminum silicate Yb-doped optical fiber have been γ–irradiated with different doses from a 60 Co source. All fibers passed the test in the intereferometric setup for the purpose of the pump induced RIC effect. During the test the phase shifts induced in the fiber by 1-ms-square pump pulses at 980 nm were recorded with a probe signal at eleven different wavelengths ranging from ~1.46 to ~1.61 μm. The phase traces have been normalized to their maximum values and averaged over 100 traces for each probe wavelength and also over all probe wavelengths. The averaged phase traces highlight the differences in their growing and decaying parts in respect to the case of non-irradiated fibers. These differences are found to be in correlation with the fiber irradiation dose. For non-irradiated fibers decay parts are perfectly fitted by one exponential function with the relaxation time constant equal to the Yb-ion excited state lifetime ~750 μs, to be the same for all fiber samples. However, for irradiated fibers the similar fitting gives a triple exponential decay with time constants estimated as ~750, ~500 and 40μs. For higher irradiation dose the difference with one exponential fitting is more pronounced. Having in mind that the obtained difference in phase shift dynamics could be associated with excitation of some color centers induced in the fiber matrix by gamma irradiation, we represent the normalized phase shifts as a superposition of two contributions. The first contribution is due to excitation of Yb-ion, the same for all fiber samples. The second is due to excitation of color centers. The amplitude of the second part highlights a degree of fiber degradation under gamma radiation and is directly proportional to the concentration of the excited color centers that, in its turn, linearly grows with the irradiation dose. Therefore, new method is regarded as a good candidate for potential applications in fiber dosimeters.
2008 Conference on Lasers and Electro-Optics, 2008
We report on all-fiber coherent combining of 1.55µm Er-doped single mode amplifiers achieved by m... more We report on all-fiber coherent combining of 1.55µm Er-doped single mode amplifiers achieved by means of active phase control that specifically employs the refractive index changes in Yb-doped fiber induced by 980nm laser diode.
Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges, 2000
We present the results of theoretical and experimental investigation of the influence of phase no... more We present the results of theoretical and experimental investigation of the influence of phase nonreciprocity on characteristics of the self-starting holographic laser based on a Nd:YAG laser crystal with an amplitude-reciprocal cavity. The goal of this study is to verify the theory of the self-starting lasers and search for an optimal scheme of the laser.
2011 2nd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications, 2011
We report on the method for monitoring of the modifications in Yb-doped optical fibers irradiated... more We report on the method for monitoring of the modifications in Yb-doped optical fibers irradiated by gammarays with the doses 1, 2, 4 and 8 kGy. This method is based on the refractive index change (RIC) effect induced in the tested fibers by square modulated optical pump pulses of 1 ms duration at 980 nm with the power up to 100 mW. The applied in-situ monitoring is based on interferometric technique and highlights the key parameters of the RIC effect that allows to characterize quantitatively the degree of the fiber degradation under the gamma radiation.
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2011
Rayleigh scattering is a fundamental threshold-free loss mechanism in optical fiber arising from ... more Rayleigh scattering is a fundamental threshold-free loss mechanism in optical fiber arising from density fluctuation frozen into the fused silica fiber during its manufacture that could be exploited for lasing control in fiber lasers . The mechanisms of the light scattering could be naturally implanted to the fiber laser by means of a passive all-fiber ring configuration that operates as a dynamical mirror . In the current work, we extend the functionality of such mirror providing it with the control of the resonance frequency by an external optical signal. The control of the resonance is achieved through the refractive index change (RIC) effect [6 -7] induced in a single mode ytterbiumdoped optical fiber by an optical pumping at the wavelength within the ytterbium absorption line.
Conference on Lasers and Electro-Optics 2010, 2010
The refractive index changes which can be induced in pumped Nd3+ and Yb3+ doped laser materials h... more The refractive index changes which can be induced in pumped Nd3+ and Yb3+ doped laser materials have been measured using two pump-probe techniques. Transient signal analysis allows to discriminate electronic and thermal contributions.
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007
The authors confirmed the hypothesis that both excited-state absorption spectra in the near UV sp... more The authors confirmed the hypothesis that both excited-state absorption spectra in the near UV spectral domain and by performing new transient interferometric measurements, thus by using an He-Ne at 632 nm as a probe, but using the same kind of laser pump source for both experiments, i.e. a Q-switched Nd:YAG pumped OPO laser delivering 10 ns pulses of about 3
The refractive index changes which can be induced in the Nd:YVO 4 , Nd:GdVO 4 and Nd:KGW high gai... more The refractive index changes which can be induced in the Nd:YVO 4 , Nd:GdVO 4 and Nd:KGW high gain laser crystals, when their Nd 3+ laser active ions are pumped from their ground-to excited-energy levels, have been carefully measured and characterized. By using two complementary optical techniques based on pump-probe interferometry and transient diffraction grating, the electronic and thermal contributions to the observed refractive index variations have been accurately determined and successfully exploited to derive various parameters such as polarizability changes, thermo-optic coefficients and thermal diffusivities. OCIS codes: (160.3380) Laser materials; (190.4720) Optical nonlinearities of condensed matter; (140.5680) Rare earth and transition metal solid-state lasers.
Spatio-temporal instability of fundamental mode in Yb3+-doped large mode area polarization-mainta... more Spatio-temporal instability of fundamental mode in Yb3+-doped large mode area polarization-maintaining fiber amplifiers was analyzed. Limitations of the amplifier output power and gain were investigated depending on the input signal parameters: spectral width, power level and polarization. The influence of backward reflection of the optical waves on the mode-instability threshold was also examined. The traveling electronic and thermal refractive index gratings following the optically-induced population gratings were found to provide the energy transfer from the main mode to the higher-order modes.
ABSTRACT Experimental and theoretical investigations were made of self-diffraction of CO2 laser r... more ABSTRACT Experimental and theoretical investigations were made of self-diffraction of CO2 laser radiation in absorbing nematic crystals. A considerable increase in the signal-wave gain occurred as a result of transfer of energy from the pump radiation near a nematic-isotropic liquid phase transition (in this case the absolute gain of a weak infrared wave reached 600%). A theoretical interpretation of the effect was based on a model of a thermal nonlinearity of a nematic liquid crystal near the phase transition. Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts: Use: Authors Title Abstract Text Return: Query Results Return items starting with number Query Form Database: Astronomy Physics arXiv e-prints
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2011
Abstract Rare-earth-doped optical fibers are considered as possible candidates for air and space ... more Abstract Rare-earth-doped optical fibers are considered as possible candidates for air and space applications such as optical sensors and optical inter-satellite telecommunication links. The use of Yb-doped optical fibers on the satellite board emerges the challenge of ...
Spatio-temporal instability of the fundamental mode in Yb<sup>3+</sup>-doped few-mode... more Spatio-temporal instability of the fundamental mode in Yb<sup>3+</sup>-doped few-mode PM fiber amplifiers with a core diameter of 8.5 μm was registered at 2-30 Watts pump power. Both experimental and theoretical analysis revealed the nonlinear power transformation of the LP<sub>01</sub> fundamental mode into high-order modes. Numerical simulation revealed self-consistent growth of the higher-order mode and traveling electronic index grating accompanying the population grating induced by the mode interference field (due to different polarizability of the excited and unexcited Yb<sup>3+</sup> ions). Experimental results and numerical calculations showed the increase of the instability threshold along with an increase of the signal frequency bandwidth.
A proof-of-principle study of a 1.97-µm Tm:Lu 2 O 3 ceramic disk laser, intracavity pumped by a 1... more A proof-of-principle study of a 1.97-µm Tm:Lu 2 O 3 ceramic disk laser, intracavity pumped by a 1.2-µm semiconductor disk laser, is presented. The demonstrated concept allows for improved pump absorption and takes advantage of the broad wavelength coverage provided by semiconductor disk laser technology. For thin disk lasers the small thickness of the gain element typically leads to inefficient pump light absorption. This problem is usually solved by using a complex multi-pass pump arrangement. In this study we address this challenge with a new laser concept of an intracavity pumped ceramic thin disk laser. The output power at 1.97 µm was limited to 250 mW due to heat spreader-less mounting scheme of the ceramic gain disk.
form only given. High-power ultrashort-pulse lasers that operate around 2μm spectral region are o... more form only given. High-power ultrashort-pulse lasers that operate around 2μm spectral region are of particular interest in expanding access to broadband coherent source options for the mid-infrared spectral region. For example, such optical frequency comb generators can be utilized for real-time, high-sensitivity and high-resolution detection of absorption features of molecular species present in the so-called “molecular fingerprint” region. Amongst other potential implementations of 2-μm ultrafast lasers are free-space optical communications, high-harmonic generation, infrared pulsed laser ablation of polymer materials and surgery. Tm-doped crystalline gain media could offer an attractive route towards the development of high-power and efficient ultrashort-pulse lasers for the 2-μm spectral region as alternatives to fiber [1] or semiconductor thin disk laser [2] approaches for which only rather limited average powers have been reported to date. For such purposes, Tm-doped crystals h...
ABSTRACT We demonstrate the first Tm-doped Lu2O3 ceramic laser utilizing disk geometry in the des... more ABSTRACT We demonstrate the first Tm-doped Lu2O3 ceramic laser utilizing disk geometry in the design of the active element. The ceramic 2-µm disk laser is pumped within the high-Q cavity of a 1.2-µm semiconductor disk laser.
An influence of backward reflection on spatio-temporal instability of the fundamental mode in Yb&... more An influence of backward reflection on spatio-temporal instability of the fundamental mode in Yb&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;sup&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;3+&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/sup&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;-doped few-mode polarization maintaining fiber amplifiers with a core diameter of 10 μm was studied experimentally and theoretically. The mode instability threshold was registered to decrease dramatically in the presence of a backward reflection of the signal from the output fiber end; an increase of the signal bandwidth or input power resulted in the increase of the threshold. Numerical simulation revealed a self-consistent growth of the higher-order mode LP&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;11&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; and a traveling index grating accompanying the population grating induced by the mode interference field (due to different polarizability of the excited and unexcited Yb&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;sup&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;3+&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/sup&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; ions). The presence of the backward-propagating wave resulted in four-wave mixing on the common index grating induced by the interference field of pairs of the fundamental LP&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;01&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; and LP&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;11&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/sub&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; modes.
Spatio-temporal instability of the fundamental mode in Yb 3+-doped few-mode PM fiber amplifiers w... more Spatio-temporal instability of the fundamental mode in Yb 3+-doped few-mode PM fiber amplifiers with a core diameter of 8.5 μm was registered at 2-30 Watts pump power. Both experimental and theoretical analysis revealed the nonlinear power transformation of the LP 01 fundamental mode into high-order modes. Numerical simulation revealed self-consistent growth of the higher-order mode and traveling electronic index grating accompanying the population grating induced by the mode interference field (due to different polarizability of the excited and unexcited Yb 3+ ions). Experimental results and numerical calculations showed the increase of the instability threshold along with an increase of the signal frequency bandwidth.
We discuss a radioactivity sensing based on monitoring of color centers formation in Yb-doped fib... more We discuss a radioactivity sensing based on monitoring of color centers formation in Yb-doped fiber under gamma irradiation. New method exploits the dynamic effect of refractive index changes (RIC) induced by laser pumping into the fiber absorption band. In our experiment four identical samples of the single-mode aluminum silicate Yb-doped optical fiber have been γ–irradiated with different doses from a 60 Co source. All fibers passed the test in the intereferometric setup for the purpose of the pump induced RIC effect. During the test the phase shifts induced in the fiber by 1-ms-square pump pulses at 980 nm were recorded with a probe signal at eleven different wavelengths ranging from ~1.46 to ~1.61 μm. The phase traces have been normalized to their maximum values and averaged over 100 traces for each probe wavelength and also over all probe wavelengths. The averaged phase traces highlight the differences in their growing and decaying parts in respect to the case of non-irradiated fibers. These differences are found to be in correlation with the fiber irradiation dose. For non-irradiated fibers decay parts are perfectly fitted by one exponential function with the relaxation time constant equal to the Yb-ion excited state lifetime ~750 μs, to be the same for all fiber samples. However, for irradiated fibers the similar fitting gives a triple exponential decay with time constants estimated as ~750, ~500 and 40μs. For higher irradiation dose the difference with one exponential fitting is more pronounced. Having in mind that the obtained difference in phase shift dynamics could be associated with excitation of some color centers induced in the fiber matrix by gamma irradiation, we represent the normalized phase shifts as a superposition of two contributions. The first contribution is due to excitation of Yb-ion, the same for all fiber samples. The second is due to excitation of color centers. The amplitude of the second part highlights a degree of fiber degradation under gamma radiation and is directly proportional to the concentration of the excited color centers that, in its turn, linearly grows with the irradiation dose. Therefore, new method is regarded as a good candidate for potential applications in fiber dosimeters.
2008 Conference on Lasers and Electro-Optics, 2008
We report on all-fiber coherent combining of 1.55µm Er-doped single mode amplifiers achieved by m... more We report on all-fiber coherent combining of 1.55µm Er-doped single mode amplifiers achieved by means of active phase control that specifically employs the refractive index changes in Yb-doped fiber induced by 980nm laser diode.
Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges, 2000
We present the results of theoretical and experimental investigation of the influence of phase no... more We present the results of theoretical and experimental investigation of the influence of phase nonreciprocity on characteristics of the self-starting holographic laser based on a Nd:YAG laser crystal with an amplitude-reciprocal cavity. The goal of this study is to verify the theory of the self-starting lasers and search for an optimal scheme of the laser.
2011 2nd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications, 2011
We report on the method for monitoring of the modifications in Yb-doped optical fibers irradiated... more We report on the method for monitoring of the modifications in Yb-doped optical fibers irradiated by gammarays with the doses 1, 2, 4 and 8 kGy. This method is based on the refractive index change (RIC) effect induced in the tested fibers by square modulated optical pump pulses of 1 ms duration at 980 nm with the power up to 100 mW. The applied in-situ monitoring is based on interferometric technique and highlights the key parameters of the RIC effect that allows to characterize quantitatively the degree of the fiber degradation under the gamma radiation.
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2011
Rayleigh scattering is a fundamental threshold-free loss mechanism in optical fiber arising from ... more Rayleigh scattering is a fundamental threshold-free loss mechanism in optical fiber arising from density fluctuation frozen into the fused silica fiber during its manufacture that could be exploited for lasing control in fiber lasers . The mechanisms of the light scattering could be naturally implanted to the fiber laser by means of a passive all-fiber ring configuration that operates as a dynamical mirror . In the current work, we extend the functionality of such mirror providing it with the control of the resonance frequency by an external optical signal. The control of the resonance is achieved through the refractive index change (RIC) effect [6 -7] induced in a single mode ytterbiumdoped optical fiber by an optical pumping at the wavelength within the ytterbium absorption line.
Conference on Lasers and Electro-Optics 2010, 2010
The refractive index changes which can be induced in pumped Nd3+ and Yb3+ doped laser materials h... more The refractive index changes which can be induced in pumped Nd3+ and Yb3+ doped laser materials have been measured using two pump-probe techniques. Transient signal analysis allows to discriminate electronic and thermal contributions.
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007
The authors confirmed the hypothesis that both excited-state absorption spectra in the near UV sp... more The authors confirmed the hypothesis that both excited-state absorption spectra in the near UV spectral domain and by performing new transient interferometric measurements, thus by using an He-Ne at 632 nm as a probe, but using the same kind of laser pump source for both experiments, i.e. a Q-switched Nd:YAG pumped OPO laser delivering 10 ns pulses of about 3
The refractive index changes which can be induced in the Nd:YVO 4 , Nd:GdVO 4 and Nd:KGW high gai... more The refractive index changes which can be induced in the Nd:YVO 4 , Nd:GdVO 4 and Nd:KGW high gain laser crystals, when their Nd 3+ laser active ions are pumped from their ground-to excited-energy levels, have been carefully measured and characterized. By using two complementary optical techniques based on pump-probe interferometry and transient diffraction grating, the electronic and thermal contributions to the observed refractive index variations have been accurately determined and successfully exploited to derive various parameters such as polarizability changes, thermo-optic coefficients and thermal diffusivities. OCIS codes: (160.3380) Laser materials; (190.4720) Optical nonlinearities of condensed matter; (140.5680) Rare earth and transition metal solid-state lasers.
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Papers by O. Antipov