The functionality of tunable diode laser spectroscopy (TDLS) systems is shown by presenting a laser hygrometer applying a 1.84-\mum VCSEL.

• 为了展示可调谐半导体激光光谱（TDLS）系统的功能，本文还介绍了一种激光湿度计，它采用了1.；84微米VCSEL作为激光光源。