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大功率垂直腔面发射激光器单管器件出光口径大、横向模式多。随着注入电流和工作温度的改变出射光偏振态在两个正交偏振基态上转换。为分析输出光偏振特性,采用500μm出光口径980nm底发射器件,通过控制器件热沉温度,利用偏振分光镜分离正交偏振基态为透射波和反射波,半导体综合参数测试仪测量其功率、中心波长等参量。分析得出:两个偏振态的光功率温度特性与未加偏振分光镜时的总输出光的温度特性基本一致,中心波长差随温度升高缓慢增加。在温度低于328K时,随着注入电流的增大,反射波首先达到阈值,形成激射。但透射光波形成激射后其斜效率大于反射波。因此在达到某个电流后两个偏振态的功率变化曲线出现交替。当温度升高到328K以上时两个偏振态的功率曲线却没有明显的交替。根据对大尺寸VCSEL器件偏振特性的研究,提出通过外腔选频的方法来控制偏振的方案,分析计算后得出外腔腔长大约为0.45mm。
High-power vertical cavity surface-emitting lasers single-tube device, a large aperture, horizontal mode and more. With the injection current and the change of working temperature, the polarization state of the outgoing light is converted on two orthogonal polarization ground states. In order to analyze the polarization characteristics of the output light, a 500μm bottom emitting device with a 980nm output aperture is used. By controlling the heat sink temperature of the device, the polarization state of the polarized light is separated into the transmitted wave and the reflected wave by the polarization beam splitter. The semiconductor integrated parameter tester measures the power, center wavelength Other parameters. The analysis shows that the temperature characteristics of the optical power in the two polarization states are basically the same as the temperature characteristics of the total output light without the polarization beam splitter, and the center wavelength difference gradually increases with increasing temperature. When the temperature is lower than 328K, with the increase of injection current, the reflected wave first reaches the threshold and forms lasing. However, the transmitted light wave lasing efficiency is greater than the reflected wave. Therefore, after reaching a certain current, the power curves of the two polarization states alternate. When the temperature rises above 328K, the power curves of the two states of polarization are not obviously alternated. Based on the research on the polarization characteristics of large-size VCSEL devices, a scheme of controlling the polarization by means of frequency selection of the external cavity is proposed. After analysis and calculation, the external cavity length is about 0.45mm.