Abstract
Noncritical birefringent phase matching in low-loss nonlinear crystals allows for efficient cw frequency conversion in external resonant cavities. Occasionally one must employ critical (non-90°) phase matching which can reduce the conversion efficiency by orders of magnitude due to the Poynting vector walk-off. For example, in lithium niobate (LN), room temperature conversion between 1 and 2 μm phase matches at 45° to the z axis and has a Boyd-Kleinman gain reduction factor of h ≤ 0.1. Since the conversion efficiency is proportional to h/λ3, second-harmonic generation (SHG) of 2-μm light is inherently at least 80 limes less efficient than SHG of 1064-nm radiation.
© 1992 Optical Society of America
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