Novel guided-wave acousto-optic frequency shifting scheme using Bragg diffractions in cascade

Tsai, C. S.; Cheng, Z. Y.
April 1989
Applied Physics Letters;4/24/1989, Vol. 54 Issue 17, p1616
Academic Journal
A novel integrated optical frequency shifter that utilizes guided-wave acousto-optic Bragg diffractions in cascade from two tilted and counterpropagating surface acoustic waves is reported. The doubly and frequency-shifted diffracted light propagates in a fixed direction, but spatially resolved from the incident light, irrespective of the magnitude of frequency tuning. A preliminary device fabricated in a Y-cut LiNbO3 planar waveguide has demonstrated a gigahertz frequency shift, a tunable bandwidth of 165 MHz, and other desirable characteristics at the optical wavelength of 0.63 μm. These preliminary results suggest that a compact integrated acousto-optic frequency shifter module may be realized in a common LiNbO3 substrate 0.2×10×1.5 cm3 in size.


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