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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Two-photon absorption of high-power picosecond pulses in PbWO_4, ZnWO_4, PbMoO_4, and CaMoO_4 crystals
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Two-photon absorption of high-power picosecond pulses in PbWO_4, ZnWO_4, PbMoO_4, and CaMoO_4 crystals

机译：PbWO_4，ZnWO_4，PbMoO_4和CaMoO_4晶体中的高功率皮秒脉冲的双光子吸收

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The nonlinear process of two-photon interband absorption is studied in tungstate and molybdate oxide crystals excited by a sequence of high-power picosecond pulses with a wavelength of 523.5 nm. The transmission of the crystals is measured for the excitation pulse intensity up to 100 GW/cm ~2. The pulse intensity in the crystals initially transparent at a wavelength of 523.5 nm is strongly limited due to two-photon absorption (TPA), and the reciprocal transmission in PbWO_4 and ZnWO_4 crystals reaches 50-60. In all crystals, TPA induces long-lived one-photon absorption, which affects the nonlinear process dynamics and leads to a hysteresis in the dependence of the transmission on the laser excitation intensity. Absorption dichroism manifests itself in a significant difference in the transmission intensities when the principal orthogonal optical axes of the crystals are excited. The TPA coefficients are determined during the excitation of two optical axes of the crystals. TPA coefficients β for the crystals vary over a wide range, namely, from β = 2.4 cm/GW for PbMoO_4 to β = 0.14 cm/GW for CaMoO_4, and the values of β can differ almost threefold when different optical axes of a crystal are excited. Good agreement is achieved between the measured intensities limited by TPA and the estimates calculated from the measured nonlinear coefficients. Stimulated Raman scattering (SRS) upon excitation at a wavelength of 523.5 nm is only detected in two of the four crystals under study. The experimental results make it possible to explain the suppression of SRS by its competition with TPA, and the measured nonlinear coefficients are used to estimate this suppression.
机译：研究了钨酸盐和钼酸盐氧化物晶体中被一系列高功率皮秒脉冲激发的波长为523.5 nm的双光子带间吸收的非线性过程。对于高达100 GW / cm〜2的激发脉冲强度，测量晶体的透射率。最初在523.5 nm波长透明的晶体中的脉冲强度由于双光子吸收（TPA）而受到严格限制，并且PbWO_4和ZnWO_4晶体中的双向传输达到50-60。在所有晶体中，TPA都会引起长寿命的单光子吸收，这会影响非线性过程动力学，并导致透射率与激光激发强度的相关性出现滞后。当晶体的主要正交光轴被激发时，吸收二色性表现为透射强度的显着差异。在晶体的两个光轴激发期间确定TPA系数。晶体的TPA系数β在很宽的范围内变化，即从PbMoO_4的β= 2.4 cm / GW到CaMoO_4的β= 0.14 cm / GW，当晶体的光轴不同时，β的值几乎可以相差三倍。兴奋。由TPA限制的测得强度与根据测得非线性系数计算得出的估计值之间达到了良好的一致性。仅在所研究的四个晶体中的两个晶体中检测到了在523.5 nm波长激发时的受激拉曼散射（SRS）。实验结果使得通过STP与TPA的竞争来解释SRS的抑制成为可能，并且使用测得的非线性系数来估计这种抑制。

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