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[Editor's Pick] Current Optics and Photonics Vol. 7 no. 3 (2023 June)

사무국 hit 629 date 2023-06-23

285 mJ Electro-optically Q-switched Er:YAG Master Oscillator Power Amplifier (MOPA) System with Adjustable Pumping Delay between Flashlamps at 2.94 μm

Heesuk Jang1 *, Hajun Song1, Hae Seog Koh1, and Han Young Ryu2

 

Current Optics and Photonics  Vol. 7 No. 3 (2023 June) pp. 297-303
DOI: https://doi.org/10.3807/COPP.2023.7.3.297

 

  Fig. 1  Mid-IR electro-optically Q-switched Er:YAG MOPA system with an adjustable pumping delay between Xenon flashlamps; (a) Schematic of the system, (b) photograph of the constructed system.

 

Keywords: Er:YAG laser, Electro-optic Q-switching, Flashlamp pumping, Mid-infrared
OCIS codes: (140.3500) Lasers, erbium; (140.3538) Lasers, pulse; (140.3540) Lasers, Q-switched;(140.3580) Lasers, solid-state; (140.3852) Lasers, amplifiers


Abstract
In this paper, we demonstrated a high-energy (285 mJ) mid-infrared flashlamp-pumped electro-optically Q-switched Er:YAG master oscillator power amplifier (MOPA) system and comprehensively investigated its temporal, spectral, and spatial characteristics. To increase the output energy, we optimized the delay between the timings at which the flashlamps of the master oscillator and power amplifier were triggered. In addition, the output energy was improved while minimizing thermal effects by cooling the MOPA system to a temperature slightly above the dew point. Consequently, the MOPA structure boosted the output energy without damaging the lithium niobate Pockels cell, which is a crucial element in Q-switching. This design realized pulses with energies up to 0.285 J and pulse durations of approximately 140 ns at a wavelength of 2,936.7 nm. This high-energy mid-IR Er:YAG MOPA system can be used for various scientific, engineering, and military underwater applications.

 

첨부파일
COPP Vol. 7 No.3, pp. 297-303.pdf