We have built a coupled master oscillator and a slave oscillator optical parametric oscillator (OPO) system that provides single-frequency, pulsed radiation in the midwave infrared (MWIR). The direct-diode-pumped master OPO provided narrow-band (<6-MHz, instrument-limited), tunable MWIR cw radiation that was used to seed a higher-peak-power pulsed slave OPO. When seeded directly at the MWIR idler, the pulsed output of the slave OPO was constrained to oscillate on a single longitudinal mode even though the slave OPO is pumped by a multilongitudinal-mode laser source. The linewidth of the pulsed output has been measured to be <220 MHz (instrument limited), which is well suited for coherent differential absorption lidar applications.
© 2002 Optical Society of America
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
Original Manuscript: May 9, 2001
Revised Manuscript: October 26, 2001
Published: February 20, 2002
John H. Marquardt, Ross W. Mackes, and Duane D. Smith, "Single-mode, tunable output from a midwave-infrared-seeded optical parametric oscillator system," Appl. Opt. 41, 1163-1168 (2002)