High-efficient Nd:YAG microchip laser for optical surface scanning

Jan Šulc; Helena Jelínková; Karel Nejezchleb; Václav Škoda

doi:10.1117/12.2292777

1 December 2017 High-efficient Nd:YAG microchip laser for optical surface scanning

Jan Šulc, Helena Jelínková, Karel Nejezchleb, Václav Škoda

Proceedings Volume 10603, Photonics, Devices, and Systems VII; 1060308 (2017) https://doi.org/10.1117/12.2292777
Event: Photonics Prague 2017, 2017, Prague, Czech Republic

Abstract

A CW operating, compact, high-power, high-efficient diode pumped 1064nm laser, based on Nd:YAG active medium, was developed for optical surface scanning and mapping applications. To enhance the output beam quality, laser stability, and compactness, a microchip configuration was used. In this arrangement the resonator mirrors were deposited directly on to the laser crystal faces. The Nd-doping concentration was 1 at.% Nd/Y. The Nd:YAG crystal was 5mm long. The laser resonator without pumping radiation recuperation was investigated {the output coupler was transparent for pumping radiation. For the generated laser radiation the output coupler reflectivity was 95%@1064 nm. The diameter of the samples was 5 mm. For the laser pumping two arrangements were investigated. Firstly, a fibre coupled laser diode operating at wavelength 808nm was used in CW mode. The 400 ¹m fiber was delivering up to 14W of pump power amplitude to the microchip laser. The maximum CW output power of 7.2W @ 1064nm in close to TEM00 beam was obtained for incident pumping power 13.7W @ 808 nm. The differential efficiency in respect to the incident pump power reached 56 %. Secondly, a single-emitter, 1W laser diode operating at 808nm was used for Nd:YAG microchip pumping. The laser pumping was directly coupled into the microchip laser using free-space lens optics. Slope efficiency up to 70% was obtained in stable, high-quality, 1064nm laser beam with CW power up to 350mW. The system was successfully used for scanning of super-Gaussian laser mirrors reflectivity profile.

Citation Download Citation

Jan Šulc, Helena Jelínková, Karel Nejezchleb, and Václav Škoda "High-efficient Nd:YAG microchip laser for optical surface scanning", Proc. SPIE 10603, Photonics, Devices, and Systems VII, 1060308 (1 December 2017); https://doi.org/10.1117/12.2292777

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KEYWORDS

Nd:YAG lasers

Continuous wave operation

Mirrors

Crystals

Reflectivity

Laser optics

Laser crystals

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