Diode array pumped, non-linear mirror Q-switched and mode-locked Nd : YVO4 laser – a good tool for powder SHG measurement

Pramana

S K Das²  Chandrajit Basu²  P K Datta1²  G K Samanta²  Antonio Agnesi¹  S Mukhopadhyay² 

[1] Department of Electronics, University of Pavia, Pavia, Via Ferrata 1, 27100 Italy$$;Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721 302, India$$

关键词: Non-linear mirror;    mode-locking;    Q-switching;    powder SHG.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

A non-linear mirror consisting of a lithium triborate crystal and a dichroic output coupler are used to mode-lock (passively) an Nd : YVO4 laser, pumped by a diode laser array. The laser can operate both in cw mode-locked and simultaneously Q-switched and mode-locked (QML) regime. The peak power of the laser while operating in QML regime is much higher but pulses suffers from poor amplitude stability. The incorporation of an acousto-optic modulator as an active Q-switch enhances the stability of the QML pulse envelope. The second-order non-linearity of powdered crystalline urea is conclusively measured with respect to KDP while the laser is operating in passively Q-switched and passively mode-locked regime as well as in actively Q-switched and passively mode-locked regime.

【 授权许可】

Unknown