Air-Laser-Based Standoff Coherent Raman Spectrometer

Among currently available optical spectroscopic methods, Raman spectroscopy has versatile application to investigation of dynamical processes molecules leading chemical changes in the gas and liquid phases. However, it is still a challenge realize an ideal standoff coherent spectrometer with which both high temporal resolution high-frequency can be achieved, so that one remotely probe species real time while monitoring populations their respective rovibronic levels frequency domain sufficiently spectral resolution. In present study, we construct air-laser-based spectrometer, near-infrared femtosecond (fs) laser pulses at 800 nm cavity-free picosecond N 2 + air-laser 391 generated by filamentation induced fs are simultaneously used, enabling us generate hybrid ps/fs source desired position for surveillance biochemical species. With this prototype demonstrate evolution electronic, vibrational, rotational states coupling rovibrational wave packet probed.