半导体激光器阵列非激射超模放大自发发射谱中的空间烧孔效应
Spatial holeburning effects in the amplified spontaneous emission spectra of the non-lasing supermode in semiconductor laser arrays
摘要：
利用线性化的朗之万方程，分析了两个耦合半导体激光器非激射超模中光场的放大自发发射谱。结果表明，激光模式与非激光模式下的起伏光场之间的干涉导致了空间烧孔。这种效应在激光场和非激射模式中的波动之间引入了相敏耦合。对于高激光场，这种耦合将非激射模式的光谱分裂成由两个弛豫振荡边带和中心线组成的三重态，所述两个弛豫振荡边带与激光同相，所述中心线在激射频率处相对于激光具有π半的相移。当激光强度增加到接近阈值时，光谱显示出从激光模式频率处的单个放大的自发发射线到三重态结构的连续跃迁。推导了这种过渡的解析表达式，并讨论了典型的特征。
英文摘要：
The amplified spontaneous emission spectrum of the light field in the non-lasing supermode of two coupled semiconductor lasers is analyzed using linearized Langevin equations. It is shown that the interference betweeen the laser mode and the fluctuating light field in the non-lasing mode causes spatial holeburning. This effect introduces a phase sensitive coupling between the laser field and the fluctuations in the non-lasing mode. For high laser fields, this coupling splits the spectrum of the non-lasing mode into a triplet consisting of two relaxation oscillation sidebands which are in phase with the laser light and a center line at the lasing frequency with a phase shift of pi half relative to the laser light. As the laser intensity is increased close to threshold, the spectrum shows a continuous transition from the single amplified spontaneous emission line at the frequency of the laser mode to the triplet structure. An analytical expression for this transition is derived and typical features are discussed.
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