Type I frequency doubling at 1064 nm in LaCa_4O(BO_3)_3 (LaCOB), GdCa_4O(BO_3)_3 (GdCOB), and YCa_4O(BO_3)_3 (YCOB)

摘要

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_(αββ) and d_(γββ) 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-°C)~(-1).