High-quality single-longitudinal-mode (SLM) tunable signal radiation is generated by a pulsed optical parametric oscillator (OPO) pumped by a compact, inexpensive multimode laser. The OPO is based on periodically poled lithium niobate (PPLN) in a ring cavity that is injection seeded at its resonated signal wavelength by a single-mode tunable diode laser. Accurate control of the OPO cavity length and crystal temperature ensures a continuously tunable SLM signal output frequency range of >7.5 THz (>250 cm<sup>−1</sup>); the corresponding idler output remains multimode. High-resolution molecular spectra are recorded to verify OPO performance at wavelengths of ~1.55 μm. The observed signal optical bandwidth of ≤120 MHz (≤0.0040 cm<sup>−1</sup>) compares favorably with that of a more elaborate PPLN OPO system pumped by a pulsed single-mode laser.
© 2001 Optical Society of America
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6360) Spectroscopy : Spectroscopy, laser
Yabai He and Brian J. Orr, "Tunable Single-Mode Operation of a Pulsed Optical Parametric Oscillator Pumped by a Multimode Laser," Appl. Opt. 40, 4836-4848 (2001)