温度对可调谐半导体激光器输出波长的影响
Effect of Temperature on the Output Wavelength of a Tunable Semiconductor Laser

可调谐半导体激光吸收光谱(Tunable Diode Laser Absorption Spectroscopy)是一种能够在工业应用中实现对气体组分浓度和温度场甚至速度场测量的检测技术。在TDLAS检测技术中，如何实现输出波长与待测气体吸收波长的精确校准是问题的关键。在本文中，我们采用温度调谐来观察温度对输出波长产生的影响。在温度调节中，温度的变化会引起腔体内部气体折射率的变化，而折射率变化会影响内部光学系统，使输出波长发生变化，我们采用DFB激光器管芯(分布反馈激光器)作为发光芯片，制作出了测量甲烷气体浓度的激光器。该激光器内部温度每上升1℃，波长向长波方向漂移0.1 nm，每降降低1℃，中心波长向短波方向增加0.1 nm。
Tuneable semiconductor laser absorption spectroscopy (Tunable Diode Laser Absorption Spectroscopy) is a detection technique that measures the gas component concentration and temperature field and even velocity field in industrial applications. In the TDLAS detection technology, how to realize the accurate calibration is the key to the problem. In this paper, we employ temperature tuning to observe the effect of temperature on the output wavelength production. In temperature regulation, the change of temperature will cause the change of the refractive index of the gas inside the cavity, and the change of the refractive index will affect the internal optical system and change the output wavelength. We use the DFB laser core (distribution feedback laser) as the light-emitting chip to make a laser to measure the concentration of methane gas. It is concluded that when the internal temperature of the laser rises by 1？C, the wavelength drifted by 0.1 nm in the long wave direction, and by 1？C decrease, the central wavelength was increased by 0.1 nm.