Abstract
Large-sized and optical-quality GdCa 4O(BO 3) 3 (GdCOB) crystal can be grown from melt by CZ pulling method. GdCOB is transparent in the range of 320–2600 nm. Second-harmonic-generation (SHG) experiments were carried out on the samples along ( θ=90°, φ=46°) phase-matching (PM) direction in the XY-main plane and (66.8°, 47.4°), (66.8°, 132.6°) PM directions out of the main planes, respectively. The SHG conversion efficiency of an 8 mm long sample along (66.8°, 132.6°) PM direction was larger than 33% at 31 mJ input energy by a Q-switched Nd : YAG laser, which is the best result obtained so far to the best of our knowledge. The d eff of these PM directions were estimated by comparing the conversion efficiency with that of KTP crystal. (66.8°, 132.6°) PM direction whose d eff is 2.1 pm/v was reported for the first time as the optimum PM direction in GdCOB crystal. The angular acceptance and walk-off for these different directions were calculated, which shows GdCOB has a small walk-off and a large angular acceptance.
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