Studies of high-power CW and quasi-CW parametric UV generation by ADP and KDP in an argon-ion laser cavity

Studies of second harmonic conversion of the 5145-Å line of the Ar II ion laser spectrum into the near UV at 2573 Å are presented. Close to optimum conditions were achieved by utilizing 90° phase matching in ADP and KDP crystals in a low loss focusing cavity. Small absorption losses in the cavity at the second harmonic frequency are presently preventing the realization of the expected theoretical efficiency.