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Tunable single-mode operation of a pulsed optical parametric oscillator pumped by a multimode laser

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Abstract

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-1); 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-1) compares favorably with that of a more elaborate PPLN OPO system pumped by a pulsed single-mode laser.

© 2001 Optical Society of America

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