A narrow-linewidth comb-linked nonlinear source is used as master radiation to injection lock a room-temperature mid-infrared quantum cascade laser (QCL). This process leads to a direct lock of the QCL to the optical frequency comb, providing the unique features of narrow linewidth, absolute frequency, higher output power, and wide mode-hop-free tunability. The QCL reproduces the injected radiation within more than 94%, with a reduction of the frequency-noise spectral density by 3 to 4 orders of magnitude up to about 100 kHz, and a linewidth narrowing from a few MHz to 20 kHz.
© 2012 Optical Society of AmericaFull Article | PDF Article
P. Spano, S. Piazzolla, and M. Tamburrini
Opt. Lett. 10(11) 556-558 (1985)
C. D. Nabors, A. D. Farinas, T. Day, S. T. Yang, E. K. Gustafson, and R. L. Byer
Opt. Lett. 14(21) 1189-1191 (1989)
Rogerio T. Ramos, Alwyn J. Seeds, Aldario Bordonalli, Philippe Gallion, and Didier Erasme
Opt. Lett. 19(1) 4-6 (1994)