Based on the gas multi-pass absorption cell with dual-optical paths (long optical path: 72.46 m; short 36.23 m), a measurement method of simultaneously detecting water vapor spectra is advanced. Combining narrow line-width external cavity diode laser and high-precision Fabry-Perot etalon, high-resolution simultaneous device for in 1 μm band developed. Since has excellent polarization characteri...

Locking to a fringe of a tilt-tuned etalon provides a simple, inexpensive method for stabilizing tunable lasers. Here, we describe the use of such a system to stabilize an external-cavity quantum cascade laser; the locked laser has an Allan deviation of approximately 1 MHz over a one-second integration period, and has a single-scan tuning range of approximately 0.4  cm(-1). The system is robust...