Quasi-continuous-wave long-pulsed, all-solid-state Nd:YAG modeless laser

Xiaoming Chen; Lei Zhang; Xiafei Xu; Yanhua Lu; Huaijin Ren

doi:10.1117/12.2533707

17 May 2019 Quasi-continuous-wave long-pulsed, all-solid-state Nd:YAG modeless laser

Xiaoming Chen, Lei Zhang, Xiafei Xu, Yanhua Lu, Huaijin Ren

Proceedings Volume 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019); 111702E (2019) https://doi.org/10.1117/12.2533707
Event: Fourteenth National Conference on Laser Technology and Optoelectronics, 2019, Shanghai, China

Abstract

We demonstrate the quasi-continuous-wave long-pulsed operation of a compact all-solid-state modeless laser based on intracavity frequency-shifted feedback by an acousto-optic modulator. The laser active medium is an Nd:YAG crystal rod, side-pumped by high-brightness laser diodes of 808 nm. When the pump repetition and duration are 200 Hz and 250 μs, the maximum single pulse energy of 85 mJ is produced at an optical conversion efficiency of ~34%, and also a good beam quality of M² _X = 1.80 and M² _Y = 1.78 is obtained in the horizontal and vertical directions respectively. Moreover, a narrow continuous spectrum is achieved with the 3-dB linewidth of 75 pm (i.e. 20 GHz) and the center wavelength of 1064.16 nm. Via the sum frequency generation, such a long-pulse (several hundred μs), narrow-linewidth modeless laser source is preferred for solving the major problem of saturation of the mesospheric sodium atoms and can create a much brighter sodium guide star to meet the needs of adaptive imaging applications in astronomy.

Citation Download Citation

Xiaoming Chen, Lei Zhang, Xiafei Xu, Yanhua Lu, and Huaijin Ren "Quasi-continuous-wave long-pulsed, all-solid-state Nd:YAG modeless laser", Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 111702E (17 May 2019); https://doi.org/10.1117/12.2533707

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