Title :
Wide-band nonlinear chirp transducers for planar acoustooptic deflectors
Author :
Anemogiannis, K. ; Russer, P. ; Weigel, R.
Author_Institution :
Siemens Res. Lab., Munchen, West Germany
Abstract :
The design, fabrication, and performance characteristics of LiNbO/sub 3/-based wideband nonlinear interdigital chirp transducers are reported. A 54% bandwidth centered at 720 MHz has been obtained for a collinear deflector on a YX substrate. A 66% bandwidth at a midband frequency of 600 MHz has been designed for a Bragg deflector on a YZ substrate with electrodes tilted to satisfy the Bragg condition. Both transducers are down-chirp designs. The chirp waveform has been optimized using an accurate model of analysis. The transducers have been fabricated using 10:1 reduction projection printing and the liftoff technique. Good agreement has been found between theory and measurement. No severe bulk wave generation has been observed.<>
Keywords :
acousto-optical devices; integrated optics; lithium compounds; optical deflectors; ultrasonic transducers; 10:1 reduction projection printing; 600 MHz; 720 MHz; Bragg deflector; LiNbO/sub 3/ substrate; LiNbO/sub 3/ wideband nonlinear interdigital chirp transducer; YX substrate; YZ substrate; bandwidth; chirp waveform; collinear deflector; down-chirp designs; liftoff technique; midband frequency; planar acoustooptic deflectors; Acoustic transducers; Bandwidth; Chirp; Electrodes; Fingers; Frequency response; Laboratories; Optical signal processing; Surface acoustic waves; Wideband;
Conference_Titel :
Microwave Symposium Digest, 1989., IEEE MTT-S International
Conference_Location :
Long Beach, CA, USA
DOI :
10.1109/MWSYM.1989.38716
