Laser‐induced grating spectroscopy of cadmium telluride
Laser‐induced grating spectroscopy of cadmium telluride
复制标题
碲化镉的激光诱导光栅光谱
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
J. Aldridge
中科院分区：
文献类型：
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作者：
M. Petrović;A. Suchocki;R. Powell;G. Cantwell;J. Aldridge
Laser‐induced transient gratings produced by two‐photon absorption of picosecond pulses at 1.064 μm were used to examine the room‐temperature nonlinear optical responses of CdTe crystals with different types of conductivity. Pulse‐probe degenerate four‐wave mixing measurements of grating dynamics on subnanosecond time scales were used to measure the ambipolar diffusion coefficient (Da) of charge carriers in the crystals. The value of Da =3.0 cm2 s−1 which was obtained is in very good agreement with theoretical estimates. A long‐lived contribution to the signal consistent with a trapped charge photorefractive effect was observed at large grating spacings for n‐type conductivity, and is tentatively attributed to a larger trap density in this sample. Measurements of the relative scattering efficiencies of successive diffracted orders in the Raman–Nath regime allowed for calculation of the laser‐induced change in the index of refraction, due to the creation of free carriers. The value of Δn=4×10−4 which was o...
