光子学报, 2018, 47 (7): 0714002, 网络出版: 2018-09-16  

平行光注入多横模1 550 nm垂直腔面发射激光器的非线性动力学实验研究

Experimental Investigation on Nonlinear Dynamics of a Multi-transverse Mode 1 550 nm Vertical-cavity Surface-emitting Laser Subject to Parallel Optical Injection
作者单位
1 西南大学 物理科学与技术学院, 重庆 400715
2 重庆科技学院 数理学院, 重庆 401331
3 内蒙古科技大学 理学院, 内蒙古自治区 包头 014010
摘要
实验研究了平行光注入下多横模1 550 nm垂直腔面发射激光器(1 550 nm-VCSEL)输出的非线性动力学特性.对于一个在自由运行时腔内同时存在基横模和一阶横模(高阶模)的1 550 nm-VCSEL, 其两横模的主激射模均为Y偏振模式(Y-LP), 当受到偏振方向沿自由运行时主激射模式偏振方向的外部光注入(即平行注入)时, 实验研究结果表明: 当平行注入光的频率νinj更临近基横模Y-LP频率νfy时(此时频率失谐Δνf定义为Δνf=νinj-νfy), 在注入光强度Pinj增加的过程中, 基横模Y-LP呈现多种动力学状态, 而高阶模Y-LP出现的动力学状态相对较少, 且能量逐渐减小.当Pinj增加到一定值时, 高阶模Y-LP完全被抑制, 此时1 550 nm-VCSEL处于单模工作状态, 即实现了基横模Y-LP的模式选择.随Δνf的逐渐增加, 实现基横模Y-LP模式选择所需的最小注入光强度Pinj, min先减小, 达到一个最小值后再逐渐增加; 在给定的Δνf条件下, Pinj, min随偏置电流I增加而增大.当平行注入光的频率νinj更靠近高阶模Y-LP的频率νhy时(此时频率失谐Δνh定义为Δνh=νinj-νhy), 在Pinj增加的过程中, 高阶模Y-LP和基横模Y-LP均呈现出多种非线性动力学状态, 但实验过程中未观察到基横模Y-LP完全被抑制的现象, 即未实现高阶模Y-LP的模式选择.
Abstract
The nonlinear dynamics of a multi-transverse mode 1550 nm vertical-cavity surface-emitting laser (1550 nm-VCSEL) under parallel optical injection is experimentally investigated. For a free-running 1550 nm-VCSEL biased at a suitable current, the fundamental and high-order modes can oscillate simultaneously and dominantly operate at the Y Linear Polarizations (Y-LPs). After introducing a Continuous Wave (CW) injection with the polarized direction along Y-LP of the free-running 1 550 nm-VCSEL (named as parallel optical injection), two different scenarios have been investigated experimentally, namely the frequency of injected CW (νinj) is close to the fundamental transverse mode frequency (νfy) (the frequency detuning is defined as Δνf=νinj-νfy) or the high-order transverse mode frequency (νfy) (the frequency detuning is defined as Δνh=νinj-νhy). For the first case, the results show that, during the process of continuously increasing injection power (Pinj), the fundamental mode undergoes diverse dynamical states, but less dynamical states are observed for the high-order mode. With the increase of Pinj, the output power of the high-order mode is decreased gradually. For a strong enough Pinj, the high-order mode can be totally suppressed and therefore the laser operates at single transverse mode, i. e. the mode selection for the fundamental mode achieves. With the increase of Δνf, the minimal injection power required for achieving the fundamental transverse mode selection (Pinj,min) decreases firstly, after reaches a minimum, and then increases. The larger the biased current, the larger the value of Pinj,min. For the second case, during the process of increasing Pinj, both high-order mode and fundamental transverse mode undergo multiple dynamical states. However, the phenomena that the fundamental transverse mode is suppressed has not been observed, i. e. the mode selection for high-order mode cannot be realized.

杨文艳, 夏光琼, 侯玉双, 蒋再富, 邓涛, 吴正茂. 平行光注入多横模1 550 nm垂直腔面发射激光器的非线性动力学实验研究[J]. 光子学报, 2018, 47(7): 0714002. YANG Wen-yan, XIA Guang-qiong, HOU Yu-shuang, JIANG Zai-fu, DENG Tao, WU Zheng-mao. Experimental Investigation on Nonlinear Dynamics of a Multi-transverse Mode 1 550 nm Vertical-cavity Surface-emitting Laser Subject to Parallel Optical Injection[J]. ACTA PHOTONICA SINICA, 2018, 47(7): 0714002.

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