论文标题
在薄片固态激光器中的自我混合干扰，每个观察周期很少有反馈光子
Self-mixing interference in a thin-slice solid-state laser with few feedback photons per observation period
论文作者
论文摘要
在300μm-thick Lindp4O12（LNP）激光器中观察到具有非零的明亮外环发射（即修饰的TEM00模式）的特殊激光模式的形成，并伴随着非零的明亮外环发射（即修饰的TEM00模式），该激光器具有与大量尺寸相比，其量大的尺寸相比，它大小相比，它大小相比，它们大小相比，它大小相比，它会大大降低。与纯TEM00模式操作相比，发现激光振荡的光子寿命大大缩短为τ_{p} = 6.74 PS，而荧光寿命为τ=130μs。理论上根据泵 - 强度依赖性的热透镜效应对特殊的横向模式的形成进行了处理，从而产生了结果光腔中的激光束点大小。此外，由于先前的横向本征强度强度以及纯TEM00场的相关抗想要，导致TEM00形成TEM00随着新出现的外环发射的形成，由于电晶型的泵功率增加，几乎所有造成人群的效果，都会表现出泵的增加。自我混合激光多普勒速度计（LDV）实验和数值模拟表明，与纯TEM00模式操作相比，在特殊模式振荡中的自发发射因子大大降低。目前的薄片固态激光器具有较大的荧光至光子寿命和降低的自发发射因子，使我们能够在每个观察期很少有反馈光子的状态下检测LDV信号。
Formation of a peculiar lasing pattern leading to a TEM00-like mode accompanied by a nonzero bright outer-ring emission (namely, a modified TEM00 mode) was observed in a 300-μm-thick LiNdP4O12 (LNP) laser with reflective flat end mirrors that was pumped with a laser diode whose focused spot size was larger than the lasing beam spot size determined by the thermal lens effect. The photon lifetimes of the laser oscillations were found to be greatly shortened to τ_{p} = 6.74 ps as compared with those in pure TEM00 mode operation, while the fluorescence lifetime was τ= 130 μs. The formation of the peculiar transverse mode was theoretically treated in terms of the pump-intensity-dependent thermal lens effect, which yields the lasing beam spot sizes in the resultant optical cavity. In addition, transverse spatial hole burning of population inversions due to the preceding transverse eigenmode intensity and the associated anti-guidance of the pure TEM00 field leading to formation of the TEM00 with an emergent outer ring emission was shown to appear with increasing pump power through the electric lens (i.e., population lens) effect, in which almost all of the population inversion contributes to lasing with a pronounced effective modal gain. Self-mixing laser Doppler velocimetry (LDV) experiments and numerical simulations revealed that spontaneous emission factors in the peculiar mode oscillations were greatly decreased in comparison with those in pure TEM00 mode operation. The present thin-slice solid-state laser possessing a large fluorescence-to-photon lifetime and decreased spontaneous emission factor enabled us to detect LDV signals in the regime of few feedback photons per observation period.
