Type I frequency doubling at 1064 nm in LaCa4O(BO3)3 (LaCOB), GdCa4O(BO3)3 (GdCOB), and YCa4O(BO3)3 (YCOB)

We have grown and characterized LaCOB, a new member to the GdCOB family of nonlinear crystals. LaCOB has a d(eff) of 0.52 +/- 0.05 pm/V and an angular sensitivity of 1224 184 (cm-rad)(-1) for type I frequency doubling at 1064 nm. The d(alphabetabeta) and d(gammabetabeta) coefficients of the nonlinear optical tensor for LaCOB, GdCOB, and YCOB were determined to have values of \0.26 +/- 0.04\ pm/V and \1.69 +/- 0.17\ pm/V, respectively. Results of phase-matching angle measurements at 1064 nm and 1047 nm predict LaCOB to be non-critically phase-matched (NCPM) at 1042 +/- 1.5 nm. We also estimate the thermal sensitivity of LaCOB to be less than 0.1 (cm-degreesC)(-1).