Bistable polarization in the visible/near-infrared semiconductor lasers by injection locking and their application to logic devices

本文研究的是半导体激光器的双稳态偏振开关，它可以同时获得正反转输出。这种双稳是通过利用具有双稳跳模特性的半导体激光器(主激光器)并将该激光器的TM偏振输出注入到另一个不断偏置到振荡阈值的半导体激光器(从激光器)中来实现的。利用CSP型半导体激光器在830 nm处振荡单模，提出并实验证实，将这两个激光器作为一个光学系统，可以在系统的注入电流和输出偏振系统之间实现双稳态偏振开关。首先，作为偏振开关的原理，解释了注入光波长与半导体激光放大器放大系数的关系。然后，解释了利用TM波注入和激光跳模来控制输出偏振的…在此基础上，从实验和模拟的角度讨论了该光学系统的双稳特性。从理论和实验上指出了这种双稳偏振开关的优点，并且可以根据主、从激光器的特性来设置开关输出的光强差和双稳环路的旋转方向。实验研究了注入TM波的SAS型和VSIS型半导体激光器的偏振特性。没有发现跳模偏振双稳开关。因此，半导体激光器中注入锁定引起的偏振开关的性能取决于波导结构。以633 nm内镜式He-Ne激光器的偏振开关为例，讨论了半导体激光器的双稳态偏振开关机理。较少

This study deals with the bistable polarization switching of semiconductor lasers whose normal and inverted output could be obtained simultaneously. This bistability is realized by utilizing a semiconductor laser with bistable mode-hopping characteristics (master laser) and injecting the TM polarization output of this laser into another semiconductor laser (slave laser) constantly biased to the oscillation threshold. It is proposed and confirmed by experiment using CSP-type semiconductor lasers oscillating a single mode at 830 nm that, by assuming these two lasers as one optical system, bistable polarization switching can be obtained between the injection current of the system and the output polarization system. First, as the principle of this polarization switching, the dependence of the injected light wavelength on amplification index of a semiconductor laser amplifier is explained. Then, the control of output polarization by TM wave injection and mode hopping of a laser is explained … More and the bistable characteristics of this optical system are discussed from experimental and simulation viwpoints based on these principles. The advantages of this bistable polarization switching are pointed out theoretically and experimentally, and the intensity difference of the ON/OFF output and the rotation direction of the bistable loop can be set according to the characteristics of the master and the slave lasers. The possibility of multislave connection is possible and an optical system that can control each gate function can be expected.Moreover, the polarization characteristics of SAS-and VSIS-type semiconductor lasers injecting the TM wave are studied experimentally. The bistable polarization switching by mode-hopping was not found. Therefore the performance of the polarization switching in a semiconductor laser caused by injection locking depends on the waveguide structure. Bistable polarization switching mechanism in semiconductor lasers is discussed with the polarization switching in a 633 nm He-Ne laser with internal mirrors. Less