Intracavity loss modulation enables offset-frequency control with bandwidths beyond what is possible by pump power modulation. To demonstrate this new method, we use a subwavelength thick graphene electro-optic modulator to stabilize the offset frequency in a Tm:fiber frequency comb at 1.95 μm wavelength. Record-low residual phase noise of 144 mrads was achieved with this new locking scheme.
© 2012 Optical Society of America
Lasers and Laser Optics
Original Manuscript: April 16, 2012
Revised Manuscript: June 6, 2012
Manuscript Accepted: June 6, 2012
Published: July 19, 2012
C.-C. Lee, C. Mohr, J. Bethge, S. Suzuki, M. E. Fermann, I. Hartl, and T. R. Schibli, "Frequency comb stabilization with bandwidth beyond the limit of gain lifetime by an intracavity graphene electro-optic modulator," Opt. Lett. 37, 3084-3086 (2012)