Phase-stabilized 1-GHz Fiber-laser Frequency Combs at 2-5micron for Coherent Fourier Transform Spectroscopy

A GHz-rate phase-stabilized fiber-laser frequency comb system is proposed to be used as a light source for coherent Fourier transform spectroscopy. The system will be developed based on our proprietary glass/fiber technology, which features a low-cost, robust, highly stable, mid-infrared light source that enables the development of a robust portable c-FTIR spectrometer for absorption measurements of many important chemical/biological species. Both the pulse repetition rate and carrier-to-envelop offset frequency of the comb system are stabilized. High system stability is attributed to a sophisticated system design and a novel feedback design for the phase stabilization with an extremely high-bandwidth (>>50kHz). The Phase I program will achieve a proof-of-concept demonstration, and the Phase II program will result in two prototype units of such an octave-spanning frequency combs, that could be delivered to NIST at the end of program.