... 350 mm at the primary wavelength. In the optical assembly design of the proposed imaging spec... more ... 350 mm at the primary wavelength. In the optical assembly design of the proposed imaging spectrograph, the other Seidel aberrations are also minimized for getting better PSFs size. To demonstrate the performances of the ...
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 2007
The ellipsometric image contrast for patterned film in whole visible range is simulated and analy... more The ellipsometric image contrast for patterned film in whole visible range is simulated and analyzed in this article. By the Fresnel equation and the Jones Matrix, the characteristic wavelength selection method to enhance the image contrast is built. The ellipsometric reflected intensity of specific thin film is nulled into dark by rotating the phase angle of compensator and the azimuth
2007 Conference on Lasers and Electro-Optics - Pacific Rim, 2007
ABSTRACT A new method for real-time and simultaneous measuring the refractive index and thickness... more ABSTRACT A new method for real-time and simultaneous measuring the refractive index and thickness of thin films is proposed. The method is based on spectral dependence of phase-shifting on reflection at one of film�s surface. The measurement consists in localizing π- phase shift observed in a channel spectrum.
2005 Quantum Electronics and Laser Science Conference, 2005
A diode-pumped relative gain of 2 dB at 1.55 μm wavelength based on evanescent excitation using a... more A diode-pumped relative gain of 2 dB at 1.55 μm wavelength based on evanescent excitation using a highly Er3+-doped laser glass over side-polished fiber was demonstrated for the first time. The pump efficiency can be highly improved with a blazed grating to achieve ultra-low-noise fiber amplifiers and upconversion fiber lasers.
Directly written by a ultra-short femto-second laser pulse, we report the phase separation and pa... more Directly written by a ultra-short femto-second laser pulse, we report the phase separation and pattern formation induced by polymerization in a liquid-crystal-monomer mixture. By varying the scanning speed of optical fields along a line, pattern transitions of photon-induced polymer structures are illustrated in shapes of double-humped, single-humped, and broken stripes. The experimental data collected by optical microscopic images are in a good agreement with numerical simulations based on a modified set of coupled 2 + 1 dimensional diffusion equations. The demonstration in this work provides a step for controlling phase separation morphologies as well as transferring patterns in polymer-dispersed liquid crystals.
We propose a f lexible method for fabricating complex fiber grating structures based on sequentia... more We propose a f lexible method for fabricating complex fiber grating structures based on sequential writing for fiber gratings with polarization control of the UV source beam. Pure apodized as well as arbitrary phase-shifted fiber Bragg gratings (FBGs) can be fabricated in a single scan. Experimental examples of raised-cos 2 apodized and dispersionless FBG filters are given to demonstrate the feasibility of this method.
This work presents a new sequential UV-writing procedure for fabricating long fiber Bragg grating... more This work presents a new sequential UV-writing procedure for fabricating long fiber Bragg grating (FBG) devices. To real-time accurately align the position of every exposed FBG section prior to UV exposure, a single-period reference fiber grating with strong refractive index modulation is probed by applying an interferometric side-diffraction method to measure the grating phase as the position reference. In this way the overlapped FBG sections can be connected section-by-section without obvious phase errors, even when the written index-modulation is weak.
A new technique based on a two-beam interferometer with polarization control for fabricating adva... more A new technique based on a two-beam interferometer with polarization control for fabricating advanced fiber Bragg grating (FBG) devices is demonstrated. By simultaneously rotating the angle of the half-wave plate, pure apodized and-phase-shifted FBGs can be fabricated in a single scan.
We theoretically demonstrate that a high-quality fiber Bragg grating dispersion compensator can b... more We theoretically demonstrate that a high-quality fiber Bragg grating dispersion compensator can be fabricated by a properly designed single-period overlap-step-scan exposure method. A practical design example and a detailed tolerance analysis of this new fabrication method are given. Index Terms-Discrete layer-peeling method, dispersion compensator, overlap-step-scan method, phase-shifted fiber Bragg gratings (PS-FBGs), step-chirped fiber Bragg gratings (SC-FBGs).
We theoretically demonstrate that a high-quality fiber Bragg grating dispersion compensator can b... more We theoretically demonstrate that a high-quality fiber Bragg grating dispersion compensator can be fabricated by a properly designed single-period overlap-step-scan exposure method. A practical design example and a detailed tolerance analysis of this new fabrication method are given. Index Terms-Discrete layer-peeling method, dispersion compensator, overlap-step-scan method, phase-shifted fiber Bragg gratings (PS-FBGs), step-chirped fiber Bragg gratings (SC-FBGs).
... 350 mm at the primary wavelength. In the optical assembly design of the proposed imaging spec... more ... 350 mm at the primary wavelength. In the optical assembly design of the proposed imaging spectrograph, the other Seidel aberrations are also minimized for getting better PSFs size. To demonstrate the performances of the ...
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 2007
The ellipsometric image contrast for patterned film in whole visible range is simulated and analy... more The ellipsometric image contrast for patterned film in whole visible range is simulated and analyzed in this article. By the Fresnel equation and the Jones Matrix, the characteristic wavelength selection method to enhance the image contrast is built. The ellipsometric reflected intensity of specific thin film is nulled into dark by rotating the phase angle of compensator and the azimuth
2007 Conference on Lasers and Electro-Optics - Pacific Rim, 2007
ABSTRACT A new method for real-time and simultaneous measuring the refractive index and thickness... more ABSTRACT A new method for real-time and simultaneous measuring the refractive index and thickness of thin films is proposed. The method is based on spectral dependence of phase-shifting on reflection at one of film�s surface. The measurement consists in localizing π- phase shift observed in a channel spectrum.
2005 Quantum Electronics and Laser Science Conference, 2005
A diode-pumped relative gain of 2 dB at 1.55 μm wavelength based on evanescent excitation using a... more A diode-pumped relative gain of 2 dB at 1.55 μm wavelength based on evanescent excitation using a highly Er3+-doped laser glass over side-polished fiber was demonstrated for the first time. The pump efficiency can be highly improved with a blazed grating to achieve ultra-low-noise fiber amplifiers and upconversion fiber lasers.
Directly written by a ultra-short femto-second laser pulse, we report the phase separation and pa... more Directly written by a ultra-short femto-second laser pulse, we report the phase separation and pattern formation induced by polymerization in a liquid-crystal-monomer mixture. By varying the scanning speed of optical fields along a line, pattern transitions of photon-induced polymer structures are illustrated in shapes of double-humped, single-humped, and broken stripes. The experimental data collected by optical microscopic images are in a good agreement with numerical simulations based on a modified set of coupled 2 + 1 dimensional diffusion equations. The demonstration in this work provides a step for controlling phase separation morphologies as well as transferring patterns in polymer-dispersed liquid crystals.
We propose a f lexible method for fabricating complex fiber grating structures based on sequentia... more We propose a f lexible method for fabricating complex fiber grating structures based on sequential writing for fiber gratings with polarization control of the UV source beam. Pure apodized as well as arbitrary phase-shifted fiber Bragg gratings (FBGs) can be fabricated in a single scan. Experimental examples of raised-cos 2 apodized and dispersionless FBG filters are given to demonstrate the feasibility of this method.
This work presents a new sequential UV-writing procedure for fabricating long fiber Bragg grating... more This work presents a new sequential UV-writing procedure for fabricating long fiber Bragg grating (FBG) devices. To real-time accurately align the position of every exposed FBG section prior to UV exposure, a single-period reference fiber grating with strong refractive index modulation is probed by applying an interferometric side-diffraction method to measure the grating phase as the position reference. In this way the overlapped FBG sections can be connected section-by-section without obvious phase errors, even when the written index-modulation is weak.
A new technique based on a two-beam interferometer with polarization control for fabricating adva... more A new technique based on a two-beam interferometer with polarization control for fabricating advanced fiber Bragg grating (FBG) devices is demonstrated. By simultaneously rotating the angle of the half-wave plate, pure apodized and-phase-shifted FBGs can be fabricated in a single scan.
We theoretically demonstrate that a high-quality fiber Bragg grating dispersion compensator can b... more We theoretically demonstrate that a high-quality fiber Bragg grating dispersion compensator can be fabricated by a properly designed single-period overlap-step-scan exposure method. A practical design example and a detailed tolerance analysis of this new fabrication method are given. Index Terms-Discrete layer-peeling method, dispersion compensator, overlap-step-scan method, phase-shifted fiber Bragg gratings (PS-FBGs), step-chirped fiber Bragg gratings (SC-FBGs).
We theoretically demonstrate that a high-quality fiber Bragg grating dispersion compensator can b... more We theoretically demonstrate that a high-quality fiber Bragg grating dispersion compensator can be fabricated by a properly designed single-period overlap-step-scan exposure method. A practical design example and a detailed tolerance analysis of this new fabrication method are given. Index Terms-Discrete layer-peeling method, dispersion compensator, overlap-step-scan method, phase-shifted fiber Bragg gratings (PS-FBGs), step-chirped fiber Bragg gratings (SC-FBGs).
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Papers by KAIPING CHUANG