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arXiv 1603.05575physics.optics
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低频受激发射辅助的光参量放大与振荡

Optical parametric amplification and oscillation assisted by low-frequency stimulated emission

Stefano Longhi

摘要:

光学参量放大/振荡为在激光器无法到达的光谱区域产生相干光提供了强有力的工具。参数增益基于频率{ \it下变频}过程,因此对于频率比泵浦波$ω_1$的频率高$ω_3$ { \it}的信号波不能实现参数增益。本文提出了一种实现{ \it上转换}光参量放大和振荡的途径,即用低频相干泵浦光放大信号光,辅之以辅助闲频光的受激发射。当信号场在光腔中共振时,就产生参量振荡。本文给出了掺钕$^{3+}$离子的三极化铌酸锂(PPLN)晶体在$λ_3=465$ nm波长上转换光参量振荡的设计参数。

英文摘要:

Optical parametric amplification/oscillation provide a powerful tool for coherent light generation in spectral regions inaccessible to lasers. Parametric gain is based on a frequency {\it down-conversion} process, and thus it can not be realized for signal waves at a frequency $ω_3$ {\it higher} than the frequency of the pump wave $ω_1$. In this work we suggest a route toward the realization of {\it up-conversion} optical parametric amplification and oscillation, i.e. amplification of the signal wave by a coherent pump wave of lower frequency, assisted by stimulated emission of the auxiliary idler wave. When the signal field is resonated in an optical cavity, parametric oscillation is obtained. Design parameters for the observation of up-conversion optical parametric oscillation at $λ_3=465$ nm are given for a periodically-poled lithium-niobate (PPLN) crystal doped with Nd$^{3+}$ ions.

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