Diode array pumped, non-linear mirror Q-switched and mode-locked Nd : YVO4 laser — a good tool for powder SHG measurement |
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| Authors: | P K Datta Chandrajit Basu S Mukhopadhyay S K Das G K Samanta Antonio Agnesi |
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| Institution: | (1) Department of Physics and Meteorology, Indian Institute of Technology, 721 302 Kharagpur, India;(2) Department of Electronics, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy |
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| Abstract: | 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. |
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| Keywords: | Non-linear mirror mode-locking Q-switching powder SHG |
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