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首页> 外文期刊>Optik: Zeitschrift fur Licht- und Elektronenoptik: = Journal for Light-and Electronoptic >Frequency detuning dependence of oscillation condition for a semilinear photorefractive optical resonator in a photorefractive material with reflection gratings
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Frequency detuning dependence of oscillation condition for a semilinear photorefractive optical resonator in a photorefractive material with reflection gratings

机译：具有反射光栅的光折变材料中半线性光折变光谐振器的振荡条件与频率的失谐关系

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摘要

Frequency detuning dependence of four-beam coupling in a photorefractive crystal pumped with two counter-propagating waves for a semilinear coherent optical resonator on the oscillation conditions has been analyzed in the case of non-degenerate-wave mixing under the slowly varying amplitude approximation method. Self oscillation can be achieved when the gain arising from the four-beam coupling is large enough to overcome the cavity loss. The effects of frequency detuning (i.e., non-degeneracy), dielectric constant and photoconductivity of the photorefractive materials on the performance of the semilinear photorefractive coherent resonator with the reflection grating configuration have also been studied in detail. The phase-conjugate reflectivity of the pumped crystal and oscillation intensity has been calculated for different input pump beam intensity ratio, intensity reflectivity of the conventional mirrors, degenerate energy coupling strength of the interacting beams. It has been found that for the higher value of the photoconductivity σ _p(>2.0 pS/cm) of photorefractive crystal, the semilinear resonator can oscillate at almost any frequency detuning (Ω) of the oscillation beam with respect to the fixed frequency of the pump waves whereas for the lower value of photoconductivity σ _p(<0.1 pS/cm) oscillation occurs only when the frequency detuning is limited to small region around Ω = 0. But reverse of the case is found for dielectric constant (ε), pump intensity ratio (p) and conventional mirror reflectivity (R).
机译：在缓慢变化的振幅近似方法下，在非简并波混频的情况下，分析了半线性相干光谐振器泵浦的具有两个反向传播波的光折变晶体中四光束耦合的频率失谐对振荡条件的依赖性。当四光束耦合产生的增益足够大以克服腔损耗时，就可以实现自振荡。还详细研究了频率失谐（即非简并），光折变材料的介电常数和光电导率对具有反射光栅结构的半线性光折变相干谐振器性能的影响。对于不同的输入泵浦光束强度比，常规反射镜的强度反射率，相互作用光束的简并能量耦合强度，已计算出泵浦晶体的相位共轭反射率和振荡强度。已经发现，对于较高的光折变晶体的光导率σ_p（> 2.0 pS / cm），半线性谐振器几乎可以在振荡束相对于固定频率的任何失谐频率（Ω）处振荡。泵浦波，而对于较低的光电导率σ_p（<0.1 pS / cm），仅当将频率失谐限制在Ω= 0附近的小区域时才会发生振荡。但是，对于介电常数（ε），情况却相反强度比（p）和常规镜面反射率（R）。

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