화학공학소재연구정보센터
Journal of Crystal Growth, Vol.212, No.1-2, 217-221, 2000
Growth of NdxGd1-xCa4O(BO3)(3) along phase-matching direction and passive mode-locking self-frequency-doubling characteristics
NdxGd1-xCa4O(BO3)(3) (NdGdCOB) grown along the optimum phase-matching (PM) direction (theta=66.8 degrees, Phi = 132.6 degrees) is reported for the first time in this paper. The utilization ratio of the as-grown crystals along the optimum PM direction is improved up to 95% when the optical devices were processed, while it is only 50% for the crystals grown along [0 1 0] direction. It often shows two large (1 5 0) facets and growth edge facets on the as-grown crystal surface. The small facets on the shoulders were determined as ((2) over bar 0 1) facets by X-rays. The ((2) over bar 0 1) edge facets will vanish and (0 1 0) edge facets will emerge when the crystal is tapered. The (0 1 0) edge facets which anchor at the three-phase-boundary (TPB) are the principal cause for the formation of (0 1 0) twins. Passive modulated Q-switched and mode-locking green laser operation at 530 nm were achieved in NdGdCOB crystal using a xenon flash lamp as the pump source, Cr4+ : YAG crystal as the saturable absorber with a plane-concave cavity, which is also reported here for the first time.