A sensitive observation of the photo-refraction effects in BIBO and LBO crystals basing on the loss modulation of laser intracavity

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• 作者：Shixiang Xu ; Yanxia Gao
• 关键词：Photo-refraction ; Optical parametric amplification ; Laser oscillator
• 刊名：Optics Communications
• 出版年：2012
• 出版时间：1 November, 2012
• 年：2012
• 卷：285
• 期：24
• 页码：5425-5428
• 全文大小：264 K

文摘

We present a sensitive scheme basing on the sensitive intracavity loss modulation to observe photo-refraction (PR) effects of some nonlinear crystals usually used for optical parametric chirped pulse amplification (OPCPA), e.g. BIBO and LBO, pumped by the second harmonic (SH) of intense 800 nm ultrashort laser pulse chain. Our results show that the dynamical PR effects of BIBO and LBO crystals need about 10 s to reach a steady state or to fade away after their pumping switch on or off. These data imply that using these kinds of crystals for multi-stages OPCPA with the repetition rate from some Hz to tens of Hz, it may be necessary to consider the deterioration of the OPCPA stability due to the PR effects. However, if the repetition rate is high (¡«kHz) or low enough (<0.1 Hz), the PR effects become negligible for the stability.