30W Yb3+ pulsed fiber laser with wavelength tuning and its second harmonic generation

A. A. Krylov

doi:10.1117/12.739836

4 April 2007 30W Yb³⁺ pulsed fiber laser with wavelength tuning and its second harmonic generation

A. A. Krylov

Proceedings Volume 6610, Laser Optics 2006: Solid State Lasers and Nonlinear Frequency Conversion; 66100D (2007) https://doi.org/10.1117/12.739836
Event: Laser Optics 2006, 2006, St. Petersburg, Russian Federation

Abstract

We have investigated various operation regimes and resonator designs of the diode-pumped Yb³⁺-doped fiber laser, containing acoustooptic filter and modulator inside the resonator. To imbed the polarization sensitive acoustooptic tunable spectral filter into the polarization non-maintaining resonator, based on an isotropic single-mode fiber, without 3db polarization losses, CaCO₃ single-crystal non-dispersive polarization splitter was applied. By utilizing special designed laser resonator with acoustooptic filter and modulator inside, there were obtained stable smooth bell-shaped pulses, their duration depending on the resonator traveling time and their repetition rate being determined exclusively by the outer generator, controlling the acoustooptic modulator. More than 20nm acoustooptic tuning band of pulsed Yb^3-doped fiber laser radiation and 100nm tuning of CW one were obtained without polarization losses. 30W stable average power was reached through the two-stage amplification, using Yb³⁺-doped fiber and 14μm MFD W-fiber. For the sake of improving the laser cutting resolution we have investigated the possibility ofthe effective Second Harmonic Generation ofthis pulsed Yb³⁺-doped fiber laser radiation. 4W stable output average Second Harmonic power was obtained through the Second Harmonic Generation along the X-axis of the KTP crystal, further increasing of Second Harmonic power being limited by the thermal self-focusing of the Second Harmonic radiation, resulted in crystal damage.

Citation Download Citation

A. A. Krylov "30W Yb³⁺ pulsed fiber laser with wavelength tuning and its second harmonic generation", Proc. SPIE 6610, Laser Optics 2006: Solid State Lasers and Nonlinear Frequency Conversion, 66100D (4 April 2007); https://doi.org/10.1117/12.739836

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KEYWORDS

Crystals

Polarization

Acousto-optics

Resonators

Fiber lasers

Laser resonators

Nonlinear crystals

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