Passively Q-switched radially polarized LG01 mode laser using circular Dammann grating

Cylindrical vector-polarized vortex pulses from a passively Q-switched laser are demonstrated. Pump radiation reshaped into a size-controlled annular profile via circular Dammann grating produces an efficient excitation of the LG01 mode. The YAG  /  Nd  :  YAG  /  Cr4  +    :  YAG composite crystal...

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Bibliographic Details
Published in:Optical engineering 2021-04, Vol.60 (4), p.046101-046101
Main Authors: Zhang, Linghao, Xia, Kegui, Yu, Junjie, Hu, Jingpei, Zhou, Changhe, Li, Jianlang, Zeng, Aijun, Huang, Huijie
Format: Article
Language:English
Online Access:Get full text
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Summary:Cylindrical vector-polarized vortex pulses from a passively Q-switched laser are demonstrated. Pump radiation reshaped into a size-controlled annular profile via circular Dammann grating produces an efficient excitation of the LG01 mode. The YAG  /  Nd  :  YAG  /  Cr4  +    :  YAG composite crystal structure is found to reduce the Q-switching threshold and significantly suppress thermal damage, thus allowing ability to obtain a passively Q-switched pulse. The threshold pumping power is found to be 4.35 W, with a slope efficiency of 23.1%. A maximum peak power of 3.24 kW, maximum pulse energy of 53.46  μJ, pulse width of 17.5 ns, and repetition rate of 2.695 kHz are obtained. Furthermore, a radially polarized output with a polarization degree of 88.9% is confirmed. Finally, mode and polarization tuning are also discussed.
ISSN:0091-3286
1560-2303
DOI:10.1117/1.OE.60.4.046101