Journal
OPTICS AND LASER TECHNOLOGY
Volume 94, Issue -, Pages 165-170Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2017.03.033
Keywords
Laser theory; Q-switched laser; Single-mode laser
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Funding
- National Natural Fund Project of China [61505012]
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In this paper, the effect of cavity length on a low-energy single longitudinal mode (SLM) pre-lase Q-switched laser is analyzed and demonstrated. Taking a Pr:YLF laser as an example, the basic output characteristics under pre-lase technology are shown. The SLM is degraded when the cavity length is as large as 25 mm. Further, for cavity lengths of 15 or 20 mm, SLM is achieved with different output characteristics. Compared with a long cavity (20 mm), the short-cavity case (15 mm) is indeed helpful for obtaining an SLM laser; however, the single-pulse energy, pulse width, and energy extraction efficiency are decreased by 4.7, 48, and 6.7%, respectively. The results of this analysis show that the cavity length influences the output characteristics and determines the realization of SLM in a pre-lase Q-switched laser. This is because the short cavity induces a relatively strong gain identification for the seed signal. Then, the time cost of the mode competition decreases and SLM can be achieved easily. However, a long cavity is conducive to mode competition, which generates superior output characteristics. (C) 2017 Elsevier Ltd. All rights reserved.
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