Dynamics and long-term stability of single and multi-longitudinal mode 473-nm diode-pumped Nd:YAG/KNbO<sub>3</sub> lasers

Thierry Georges; Julien Rouvillain; Corinne Chauzat; Yann Mousseaux; Raymond Le Bras

doi:10.1117/12.590778

27 April 2005 Dynamics and long-term stability of single and multi-longitudinal mode 473-nm diode-pumped Nd:YAG/KNbO₃ lasers

Thierry Georges, Julien Rouvillain, Corinne Chauzat, Yann Mousseaux, Raymond Le Bras

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Proceedings Volume 5707, Solid State Lasers XIV: Technology and Devices; (2005) https://doi.org/10.1117/12.590778
Event: Lasers and Applications in Science and Engineering, 2005, San Jose, California, United States

Abstract

Diode pumped frequency doubled Nd :YAG microchip lasers should become an alternative to air-cooled argon ion lasers. The main issues to be solved are the long-term stabilization of the single frequency operation and the power control of the multi-frequency operation. These questions are mostly related to the laser dynamics. In this paper, we present an accurate modelling of the laser dynamics, including quenching processes, non uniform pumping, partial overlap of optical signals and excited-state populations, hole burning and type-I frequency doubling. We theoretically predict that even in multimode operation, only one mode is oscillating at a time, with a mode hoping at a rate of about 50 kHz. This behavior, quite different from the well known dynamics of intra-cavity type-II frequency doubled lasers (green noise) is experimentally confirmed. Diode pumped frequency doubled Nd:YAG 473 nm lasers based on a simple linear cavity are built and exhibit high output power (90+ mW) and record slope efficiency (45% with respect to absorbed power). The understanding of its 2-mode operation allowed us to stabilize the average output power. A similar laser was operated on a single frequency. No wavelength drift could be measured and no mode hopping was observed over 24 hours.

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Thierry Georges, Julien Rouvillain, Corinne Chauzat, Yann Mousseaux, and Raymond Le Bras "Dynamics and long-term stability of single and multi-longitudinal mode 473-nm diode-pumped Nd:YAG/KNbO₃ lasers", Proc. SPIE 5707, Solid State Lasers XIV: Technology and Devices, (27 April 2005); https://doi.org/10.1117/12.590778

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KEYWORDS

Nd:YAG lasers

Crystals

Nonlinear crystals

Semiconductor lasers

Hole burning spectroscopy

Laser stabilization

Diodes

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