Mr. Kryštof Kadlec Profile

Kryštof Kadlec

Student at Czech Technical University in Prague (FNSPE)

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Laser physics

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Publications (2)

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Proceedings Article | 12 March 2024 Presentation + Paper

Output parameters optimization of Q-switched Nd:YAG/V:YAG microchip laser generating at 1.34 µm

Kryštof Kadlec, Jan Šulc, Helena Jelínková, Karel Nejezchleb

Proceedings Volume 12864, 128640E (2024) https://doi.org/10.1117/12.3000097

KEYWORDS: Laser radiation, Nd:YAG lasers, Q switched lasers, Aspheric lenses, Optical pumping

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Q-switched microchip lasers are very compact sources of directional radiation. To construct such a radiation source in the 1.3 μm spectral region, Nd:YAG active medium with V:YAG saturable absorber can be used. Radiation in this spectral range is safer for the eye in comparison with 1.06 μm radiation due to its higher absorption in the water. For this reason, Nd:YAG/V:YAG microchip laser could be suitable for free-space light manipulation applications such as LIDARs. Nd:YAG/V:YAG microchip lasers and optimization of their output parameters based on diode-pumping beam parameters variation are presented here. For this optimization, aspheric lenses were used, which made it possible to increase the pumping beam area in the waist more than four times from 0.13 mm² to 0.58 mm². Two Nd:YAG/V:YAG microchip lasers with a total length of 2.6 mm and 4.7 mm were tested. In both cases, the initial transmission of the V:YAG saturable absorber was 80 % @ 1.34 μm and the output coupler reflectivity was 90 % @ 1.34 μm. Lasers were pumped longitudinally by a fiber-coupled laser diode (core diameter 400 μm, numerical aperture 0.22) in a pulse regime at a wavelength of around 805 nm in the range of repetition frequencies of 10 − 1000 Hz. Both Nd:YAG/V:YAG lasers provided Q-switched pulses at a wavelength of 1338 nm. By increasing the pumping beam area it was possible to achieve almost twice as high pulse energy and peak power up to 76 μJ and 85 kW using a 2.6 mm long laser. In the case of a 4.7 mm long laser, the pulse energy and peak power increased more than four times up to 139 μJ and 84 kW. The output pulse duration hardly depended on used pumping optics and its mean value was 0.92 ns/2.6 mm and 1.91 ns/4.7 mm. Higher spatial transverse modes were not observed for most pumping pulse repetition frequencies.

Proceedings Article | 9 June 2023 Poster + Paper

Comparison of compact lasers Nd:YAG/V:YAG and Nd:YAP/V:YAG generating in the 1.3μm spectral region

Kryštof Kadlec, Jan Šulc, Helena Jelínková, Karel Nejezchleb, Lukáš Beran, Radim Kudělka

Proceedings Volume 12577, 125770D (2023) https://doi.org/10.1117/12.2665109

KEYWORDS: Laser radiation, Pulsed laser operation, Nd:YAG lasers, Laser crystals, Q switched lasers

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The aim of this work was to design a compact Q-switched laser generating radiation in the 1.3 μm spectral region. Two active materials, Nd:YAG and Nd:YAP, were used to construct such a compact laser with stable nanosecond pulses which could be used as a laser source of LIDAR for autonomous vehicle control. A constructed laser was pumped longitudinally by a fiber-coupled laser diode (core diameter 400 μm, numerical aperture 0.22) in a pulse regime at a wavelength of around 805nm in the range of repetition frequencies of 10 − 500 Hz. A V:YAG saturable absorber with an initial transmission of 85% was used to achieve the Q-switched regime. The pumping resonator dielectric mirror had a high transmission for pumping radiation and high reflectivity for generated 1.3 μm radiation. The output resonator dielectric mirror reflectivity was 90% @ 1.3 μm. The Nd:YAG/V:YAG laser provided radiation at a wavelength of 1318nm with pulse energy up to 162 μJ, pulse length ∼ 13.5 ns, and pulse peak power up to 12.3 kW. With the Nd:YAP/V:YAG compact laser generating at a wavelength of 1342 nm, a pulse energy of up to 193 μJ, pulse length ∼ 11.8 ns, and pulse peak power up to 16.2 kW, was achieved. Generated pulse energy and peak power decay with increasing pumping frequency was steeper in the case of Nd:YAP/V:YAG laser due to poorer thermal conductivity of Nd:YAP crystal compared to Nd:YAG crystal. On the other hand, the Nd:YAP/V:YAG laser showed better stability of the wavelength and polarization of the output radiation. In the case of both lasers, linearly polarized radiation with TEM00 single-mode spatial profile was generated.

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