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首页> 外文会议>Photonics, Devices, and Systems III >Dynamic gratings in photorefractive cadmium telluride crystals
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Dynamic gratings in photorefractive cadmium telluride crystals

机译：光折射碲化镉晶体中的动态光栅

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摘要

The paper is a study into the spectroscopic and nonlinear-optical properties of semiconductor photorefractive crystals based on cadmium telluride (CdTe) doped with transition metals or irradiated by electrons and gamma-quanta. The protorefractive response is analyzed using the four-wave mixing pattern of laser pulses one of which is delayed in time. It is found that both irradiation and doping of cadmium telluride crystals with vanadium, titanium or iron leads to changes in the spectroscopic and nonlinear-optical properties of the crystals. Apart from relatively narrow (about 100 nm ) bands appearing in the absorption spectra due to additional energy levels within the band gap, one can observe variations in the absorption factor over a wide spectral region (1-3 μm). Recording of dynamic holograms is realized with no external electric field owing to pulsed laser radiation at a wavelength of 1.06 μm and diffraction efficiency of 1-2%. Continuous laser excitation (1.5 μm wavelength and an applied external electric field of about 2 kV / cm ) with the use of the two-wave mixing pattern has enabled energy transfer to a weak wave giving the amplification factor that comes to 1 cm~(-1).
机译：本文研究了掺有过渡金属或电子和伽马射线辐照的碲化镉（CdTe）半导体光折射晶体的光谱和非线性光学性质。使用激光脉冲的四波混频模式分析原折射响应，其中之一会延迟时间。已经发现碲化镉镉晶体的辐照和掺杂钒，钛或铁都会导致晶体的光谱和非线性光学性质发生变化。除了由于带隙内的附加能级而在吸收光谱中出现相对较窄的波段（约100 nm）以外，人们还可以观察到宽光谱区域（1-3μm）内吸收系数的变化。由于波长为1.06μm的脉冲激光辐射和1-2％的衍射效率，动态全息图的记录无需外部电场即可实现。使用两波混合模式进行连续激光激发（波长为1.5μm，施加的外部电场约为2 kV / cm），使能量能够转移到微弱的波上，放大倍数达到1 cm〜（- 1）。

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