We proposed and demonstrated a novel method for the evaluation of optical pulse trains generated by a multifrequency continuous-wave Raman laser operating at a mode separation of 17.6 THz. This approach is based on the detection of a nonlinear signal arising from the intensity modulation of a pulse train, which should provide a useful means for measuring the deviation from phase locking of multifrequency lasers. Our results suggest that an optimization of intracavity dispersion allows the generation of phase-locked multifrequency emissions, which leads to optical pulse trains at a repetition rate in excess of 10 THz.
© 2010 Optical Society of America
Lasers and Laser Optics
Original Manuscript: October 19, 2009
Manuscript Accepted: January 26, 2010
Published: March 11, 2010
Shin-ichi Zaitsu and Totaro Imasaka, "Quantitative measurement of the phase locking of highly repetitive ultrashort optical pulses generated by a multifrequency continuous-wave Raman laser," Appl. Opt. 49, 1586-1592 (2010)