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https://doi.org/10.3938/NPSM.70.383
Output Characteristics of an Intracavity 355 nm UV Laser
New Phys.: Sae Mulli 2020; 70: 383~389
Published online April 29, 2020;  https://doi.org/10.3938/NPSM.70.383
© 2020 New Physics: Sae Mulli.

Dohwan KWON1, Gyu Ug KIM2*

1Department of Physics, Kumoh National Institute of Technology, Gumi 39253, Korea
2Department of Optical Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea
Correspondence to: gukim@kumoh.ac.kr
Received December 9, 2019; Revised February 13, 2020; Accepted February 26, 2020.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
We have constructed an acousto-optically Q-switched 1064 nm Nd:YVO$_4$ laser pumped by using an 888 nm laser diode. Two LBO crystals were inserted into the cavity to generate the second (532 nm) and the third (355 nm) harmonics. The one side of the third harmonic crystal is Brewster-cut so that the 355 nm laser oscillates without passing through the output mirror. The maximum output power of continuous wave 1064 nm was obtained to be 23.4 W, when the laser diode power and the reflectivity of the output mirror were 78 W and 80%, respectively. And, the optical-to-optical conversion efficiency and the slope efficiency were measured to be 32.5% and 37.3%, with each other. As a result, we found that the 355 nm laser had an maximum output power of 6.1 W and a pulse width of 83 ns at a repetition rate of 40 kHz. The beam quality factor $M^{2}$ was measured to be $M_{x}^{2}$ = 1.150, $M_{y}^{2}$ = 1.178.
PACS numbers: 42.55.Xi, 42.65.Ky, 42.60.Gd
Keywords: Diode-pumped laser, Harmonic generation, Q-switching


May 2020, 70 (5)
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