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26 January 2005 Study on simultaneous passive Q-switching and mode-locking at low-pump power in a LD-pumped Nd3+:YVO4-Cr4+:YAG laser
Yang Liu, Hongyun Qiu, Liqun Sun, Qian Tian
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Proceedings Volume 5627, High-Power Lasers and Applications III; (2005) https://doi.org/10.1117/12.573704
Event: Photonics Asia, 2004, Beijing, China
Abstract
Simultaneous passive Q-Switching and mode locking at low pump power was observed in a Laser Diode (LD) pumped Nd3+:YVO4-Cr4+:YAG laser, detailed studies were experimentally carried out. A fiber-coupled LD with maximum output power of 2 W is used as pump source. In a 50cm long cavity, the repetition rate of obtained mode-locking pulse train is about 300MHz, and the pulse duration was estimated to be at sub-nanosecond level. The repetition rate of the passive Q-Switched pulse train varies from 10kHz~130kHz with the increasing of the pump power. It was found that the threshold of incident pump power to generate mode-lock in such a laser is dependent on the position of Cr4+:YAG crystal inside the cavity. Select proper Cr4+:YAG as saturable absorber and optimize its position, simultaneous Q-Switching and mode-locking occurred in the Nd3+:YVO4 laser at pump power as low as about 200 mW. The experimental result demonstrates the possibility of obtains ultra short optical pulse in a simple and low cost way, which is of great interest in some applications.
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Yang Liu, Hongyun Qiu, Liqun Sun, and Qian Tian "Study on simultaneous passive Q-switching and mode-locking at low-pump power in a LD-pumped Nd3+:YVO4-Cr4+:YAG laser", Proc. SPIE 5627, High-Power Lasers and Applications III, (26 January 2005); https://doi.org/10.1117/12.573704
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KEYWORDS
Q switching
Mode locking
YAG lasers
Chromium
Q switches
Laser crystals
Neodymium
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