Papers by Gabriela Salamu
ABSTRACT Diode-pumped solid-state laser application in automotive industry requires high peak pow... more ABSTRACT Diode-pumped solid-state laser application in automotive industry requires high peak power, compact and reliable lasers. To date such devices were demonstrated using end pumping and side-pumping scheme. In this work we introduce a new pumping technique for diode-pumped solid-state lasers, named 'prism-by side-pumped' laser. The laser medium is rectangular and a prism is used to couple the pump beam directly from the fiber into the crystal. This geometry is simply to align and presents more compactness in comparison with an end-pumped laser, while power scaling can be realized easily. The design is interesting for passively Q-switched lasers because it allows positioning of the saturable absorber (SA) crystal between the resonator high-reflectivity mirror (HRM) and the laser medium.
Optics and Laser Technology, Oct 1, 2016
We report on output power performances obtained by diode-laser pumping of buried cladding-wavegui... more We report on output power performances obtained by diode-laser pumping of buried cladding-waveguides that were inscribed with a femtosecond-laser beam writing technique in several Nd:YVO 4 media. Continuous-wave output power of 3.4 W at 1.06 mm for an absorbed pump power at 808 nm of 10.3 W was obtained from a circular waveguide of 100-μm diameter that was realized in a 6.9-mm long, 0.5-at% Nd:YVO 4 crystal; the slope efficiency with respect to the absorbed pump power was 0.36. The pump at 880 nm, directly into the 4 F 3/2 emitting level, was used to improve the waveguide output characteristics. With an absorbed pump power of 9.8 W at 880 nm, the same waveguide yielded 4.4 W at 1.06 mm, whereas for emission at 1.34 mm the output power reached 1.7 W; the slope efficiency improved to 0.47 for laser emission at 1.06 mm and reached 0.24 for operation at 1.34 mm. Results recorded from similar waveguides that were inscribed in 0.7-at% Nd:YVO 4 and 1.0-at% Nd:YVO 4 crystals are presented.
Conference on Lasers and Electro-Optics, Jun 21, 2015
Buried waveguides have been realized in a 0.7 at.% Nd:YAG single crystal using the direct-writing... more Buried waveguides have been realized in a 0.7 at.% Nd:YAG single crystal using the direct-writing technique with a femtosecond laser. Efficient laser emission at 1.06 and 1.32 µm is demonstrated and laser action at 0.94 µm is obtained using the pump with fiber-coupled diode laser at 807 nm, the first demonstration of such devices.
We report on realization of buried cladding waveguides in Nd:YAG single crystal and ceramic media... more We report on realization of buried cladding waveguides in Nd:YAG single crystal and ceramic media by direct femtosecond (fs)-laser writing technique. A classical technique that moves the laser medium transversally to the fs-laser beam, as well as a new scheme in which the laser medium has a motion on a helical trajectory during the inscribing process was used. The waveguides laser emission performances at 1.06 and 1.3 µm have been investigated under the pump at 807 nm with a fibercoupled diode laser that was operated both in quasi-continuous wave (quasi-cw) and in cw regimes. Laser pulses with energy of 3.45 mJ at 1.06 µm and of 1.05 mJ at 1.3 µm (with overall optical-tooptical efficiency of 0.26 and 0.08, respectively) were obtained from a 50 µm in diameter circular waveguide that was inscribed by the helical-moving techniques in a 5.0-mm long, 1.1-at.% Nd:YAG ceramic medium. Characteristics of the laser emission recorded in cw operation are discussed.
Efficient 1.06-μm and 1.34-μm laser emission from cladding waveguides inscribed by femtosecond-la... more Efficient 1.06-μm and 1.34-μm laser emission from cladding waveguides inscribed by femtosecond-laser writing technique in Nd:YVO4 has been obtained using diode laser pumping at 880 nm, directly into the 4F3/2 emitting level of Nd:YVO4.
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Papers by Gabriela Salamu