Abstract
The extracavity and intracavity second-harmonic generation (SHG) of 1.06 μ m in Sr doped GdCa 4O(BO 3) 3 (GdCOB) cut for phase-matching direction of ( θ, ϕ)=(66.8°,132.3°) was investigated. With a 6-mm-long crystal, the extracavity SHG efficiency reached 55%. In the case of intracavity SHG in an end-pumped Nd:YVO 4 laser, 2.3 W of CW SHG power was obtained with an optical conversion efficiency of 17.7%. It was found that the effective nonlinear coefficient ( d eff) is increased by a factor of 1.15–1.17 compared to the undoped GdCOB crystal.
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