Wavelength Stability of Rapid and Random Wavelength-Tuned Mid-Infrared Coherent Light Source and Application to Imaging

Abstract

We have realized a rapid and random wavelength-tuned mid-infrared laser with difference-frequency generation (DFG) pumping using the two wavelengths oscillated from Ti: sapphire laser. In the experiment, a wavelength region from 5μm to 12μm is realized. The wavelength stability of the mid-infrared radiation was measured to be less than ±1.1×10^-3 μm. We realized a fastest wavelength switching speed of 1 ms. As demonstration, the real-time absorption measurements of water and liquid acetone were performed. The results show that the electronically tuned mid-IR laser is attractive for real-time imaging in the mid-IR region.