Abstract
We report what is to our knowledge the first optical parametric oscillator (OPO) generating coherent laser radiation with high optical-to-optical conversion efficiency in the near ultraviolet. The OPO, pumped at 307.8 nm by a pulsed injection-seeded XeCl excimer laser, employs a crystal of LiB3O5 in a noncritical phase-matching geometry to generate tunable output over the range 381–387 nm in the near ultraviolet and 1.5–1.6 μm in the near infrared. We report internal energy conversion efficiencies as high as 28% for the signal wave at 385.5 nm and 7% for the idler wave at 1.53 μm, leading to a total internal conversion efficiency of 35%. Studies of oscillation threshold, external and internal conversion efficiency, spectral linewidth, and temporal variation of output pulses are also reported. Temperature tuning of the LiB3O5 OPO under the noncritical phase-matching condition is demonstrated for the first time to our knowledge.
© 1991 Optical Society of America
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