Abstract

A periodic modulation of optical nonlinearity by means of ferroelectric domain reversal has led to the generation of blue light by quasi-phase matching in waveguides of, e.g. lithium niobate¹,², lithium tantalate³,², and potassium titanyl phosphate (KTP)⁴. When the linear optical constant (index) is also periodically modulated along the propagation direction, these waveguides may serve also as distributed Bragg reflectors⁵,⁶. The back reflection of light in a narrow band of wavelengths, subject to the Bragg condition, has been utilized to stabilize a diode laser pump, forcing it to oscillate in a narrower band of wavelengths suitable for second harmonic generation.

© 1993 Optical Society of America