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Extending the Tuning Range of Tunable Oscillators by Upconversion
1.Successful operation of a singly resonant parametric oscillator (SRO) was reported recently by L. S. Goldberg, Appl. Phys. Letters 17, 489 (1970);
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8.In our experiment, damage spots about 1 mm in diameter gradually formed inside the oscillator crystal after about 500 shots at a pump level of about This is somewhat less than the damage threshold reported in Ref. 1 and may be explained in part by the presence of ir‐oscillator cavity fields which exceeded the pump fields by several times due to the high‐mirror reflectivities; the damage threshold is also known to depend upon the quality of the crystal. No damage on the crystal surfaces or the ar coatings was observed in our experiment. Thus, with good quality crystals and lower mirror reflectivities or higher output coupling, the damage problem could be avoided at the intensity levels required.
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