Nonuniform pumped passively Q-switched laser using Nd:YAG/Cr4+:YAG composite crystal with high-pulse energy

Meigui Li; Yingxiong Qin; Chaojun Wang; Xiaodong Liu; Sichen Long; Xiahui Tang; Tao Wen

doi:10.1117/1.OE.58.3.036106

15 March 2019 Nonuniform pumped passively Q-switched laser using Nd:YAG/Cr⁴⁺:YAG composite crystal with high-pulse energy

Meigui Li, Yingxiong Qin, Chaojun Wang, Xiaodong Liu, Sichen Long, Xiahui Tang, Tao Wen

Author Affiliations +

Optical Engineering, Vol. 58, Issue 3, 036106 (March 2019). https://doi.org/10.1117/1.OE.58.3.036106

Abstract

A Nd : YAG / Cr^4 + : YAG composite crystal passively Q-switched laser with high-output pulse energy is studied both theoretically and experimentally. According to the characteristics of flash lamp pump, the rate equations of nonuniform pump are established. The pulse interval, pulse energy, and pulse width of the output pulse train are analyzed accurately by nonuniform pump. The experimental parameters are optimized by numerical simulation, with Cr^4 + : YAG saturable absorber initial transmittance of 14%, output coupling mirror reflectivity of 30%, and cavity length of 9.7 cm. Under the same conditions, the maximum static energy is 954.34 mJ without Q-switch. An output pulse train with four pulses can be obtained at the same pump condition in experimental study. The four pulses energy are 156.5, 151, 149.74, and 145.76 mJ in turn with corresponding intervals of 20.81, 24.16, and 46.03 μs. The average pulse width is 5.72 ns. The Q-switch efficiency is 63.2%. The energy of the four pulses decreases, the pulse interval increases, and the pulse width is basically unchanged. The nonuniform pump theoretical and experimental results are in good agreement.

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Meigui Li, Yingxiong Qin, Chaojun Wang, Xiaodong Liu, Sichen Long, Xiahui Tang, and Tao Wen "Nonuniform pumped passively Q-switched laser using Nd:YAG/Cr⁴⁺:YAG composite crystal with high-pulse energy," Optical Engineering 58(3), 036106 (15 March 2019). https://doi.org/10.1117/1.OE.58.3.036106

Received: 12 December 2018; Accepted: 26 February 2019; Published: 15 March 2019

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KEYWORDS

Crystals

Q switched lasers

Composites

Laser crystals

Q switch crystals

YAG lasers

Lamps

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