Double-Arched LDA Stagger-Pumped Electro-Optic Q-Switched Nd:YAG Green Laser Using KTP Double-Crystal Extracavity Frequency Doubling

• Published in: Journal of Russian laser research Vol. 37; no. 6; pp. 598 - 603
• Main Authors: Yue, Li, Xinyu, Chen, Yongji, Yu, Chao, Wang, Guangyong, Jin
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.11.2016; Springer Nature B.V
• Subjects: Beams (radiation); Birefringence; Direct power generation; Electro-optics; Energy management; Laser beams; Lasers; Microwaves; Offsets; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Pulse duration; Pulse width; Q factors; Q switched lasers; Resonators; RF and Optical Engineering; Second harmonic generation; Thermal lensing; X-rays; YAG lasers; double-crystal KTP; green laser; solid-state laser; extra cavity frequency doubling
• ISSN: 1071-2836; 1573-8760
• DOI: 10.1007/s10946-016-9612-6

We develop a laser utilizing second harmonic generation that exhibits both high single-pulse energy and high beam quality. The system starts with a double-arched laser-diode-array stagger-pumped electro-optic Q -switched Nd:YAG with a thermal lensing compensated convex-concave resonator. The 1,064 nm output beam is then frequency doubled in an extracavity KTP double-crystal assembly that offsets birefringence walk-off. We obtain a maximum single-pulse energy of 72.7 mJ at 532 nm with 176 mJ at 1,064 nm. The corresponding optical-to-optical conversion efficiency is 41.3%, and the pulse width is 9.2 ns at a repetition rate of 20 Hz. The beam quality factor M 2 is 1.83 in both horizontal and vertical directions at the maximum output energy, and the energy stability is better than 3% across half an hour.