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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1992),
  • paper CWQ3

Single-frequency injection-seeded KTP ring cavity optical parametric oscillator

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Abstract

With many advanced nonlinear optical materials being readily available, interest in narrowband optical parametric oscillators (OPO) has flourished.1,2 In this paper, we describe an optically simple, injection-seeded ring-cavity OPO that produces single-frequency pulses. The OFO, shown in Fig. 1, is a discrete clement three-rnirror ring cavity in which the only intracavity element is a 15-mm long KTP crystal. The ring cavity OPO is a singly resonant OPO that uses type II phase matching (o → e + o, pump → signal [resonated] + idler). The KTP crystal is oriented so that its ordinary polarization is perpendicular to the plane of the ring. The OPO is pumped with a frequency-doubled injection-seeded Nd:YAG laser, and it is seeded with a 30-mW single-mode laser diode. The laser diode, which operates at 788 nm, selects the wavelength of the signal wave. The collimated diode beam is injected into the ring cavity through the output coupler (80%R). Since oscillation within the ring cavity is inherently unidirectional, due to the parametric generation process, no Faraday isolators are placed between the laser diode and the ring cavity.

© 1992 Optical Society of America

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