1 中国科学院上海光学精密机械研究所强场激光物理国家重点实验室, 上海 201800
2 中国科学院大学, 北京 100049
3 上海科技大学, 上海 201210
研制了一套能量输出稳定、光斑分布均匀、时域近方波形的四路钕玻璃抽运源系统。系统能够输出4×180 J的基频能量(波长为1053 nm)，4×80 J的倍频能量(波长为526.5 nm)。主要结构包括四部分：前端种子源、再生放大器、钕玻璃棒放链和KDP倍频晶体。利用偏振片实现了垂直偏振的两路基频光合束，经过第二类相位匹配KDP晶体倍频，获得了共线且同偏振的526.5 nm倍频光，实现了用于150 mm口径钛宝石放大器的结构紧凑的双脉冲抽运源。
激光器 放大器 抽运源 钕玻璃 大口径钛宝石 时域双脉冲
Author Affiliations
Abstract
1 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China
A Ti:sapphire crystal with a diameter of 235 mm and thickness of 72 mm was grown by the heat exchange method (HEM). The absorption intensity of the crystal at 532 nm averaged at 91%. The figures of merit (FOMs) at different positions of the crystal were measured and the FOM value in the central region was found to reach 90. The transmittance laser beam was intact with no obvious distortions and had only a small deformation compared with the incident laser beam. A small-signal amplification experiment was performed on the Ti:sapphire crystal and a gain of more than 6 times was achieved with a pump energy density of 1.98 J/cm2. These tests indicate that the 235 mm Ti:sapphire crystal has excellent optical qualities and will further improve the energy output of a 10 PW laser system.
140.3280 Laser amplifiers 140.3590 Lasers, titanium 140.5560 Pumping Chinese Optics Letters
2018, 16(7): 071401
Author Affiliations
Abstract
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 ShanghaiTech University, Shanghai 200120, China
3 University of Chinese Academy of Sciences, Beijing 100039, China
We research some properties of parasitic lasing (PL) in the Ti:sapphire chirped pulse amplifier with the crystal diameter of 100 mm. The evolutionary process from the spontaneous emission to the PL and its influence on amplified output energy, spectrum, and beam profile are experimentally measured. The threshold of PL in the crystal is 22 J, and the output signal can still keep rising with the pump when the pump energy is below 38 J. The PL has no obvious impact on the output spectrum and beam profile besides the energy.
140.3280 Laser amplifiers 140.3590 Lasers, titanium 140.5560 Pumping Chinese Optics Letters
2017, 15(6): 061401
