Multi-field frequency modulation spectroscopy.
We Study a modification of classical FM spectroscopy in the cases where several electromagnetic fields are FM modulated, each in a different manner. This complex spectrum scans a multi-photon resonant atomic medium with the output detected by a phase-sensitive scheme. The demodulated output signal reveals the spectroscopic features of the probed medium. The case in which two different carriers are FM modulated at the same frequency and index but with an opposite phase with respect to each other is analyzed theoretically. This configuration is essential for probing Coherent Population Trapping (CPT) resonances induced by a directly modulated diode laser. Employing a macroscopic model to describe the physical properties of CPT leads to a superb fit between predicted and measured CPT characteristics.
Electrical Engineering Department, Technion, Haifa 32000, Israel. bido@tx.technion.ac.il
Ido
I
Ben-Aroya
Matan
M
Kahanov
Gadi
G
Eisenstein
D003198:Computer Simulation; D008956:Models, Chemical; D055095:Optics and Photonics; D013057:Spectrum Analysis / Q000379:methods*