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Progress and perspectives of LiNbO3 wideband Bragg cells

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1 Author(s)

Anisotropic LiNbO3 Bragg cells have been optimized for acoustooptic spectrum analyzer (AOSA) implementation in the fields of electronic warfare, and radioastronomy. Aperture time limited performances due to acoustic propagation losses are analyzed and BT optimization versus bandwidth is discussed for different optical wavelengths versus the electrode parameters. 1000 resolution points have been achieved for 1-GHz bandwidth Bragg cells operating at 830 nm in AOSA systems (radioastronomy spectrometers). In the near future 1500 points are expected with a resolution of 0.5 MHz. The diffraction efficiency is 35%/Wrf with 5-MHz resolution and 4%/Wrf with 1-MHz resolution. In addition, at 532 nm, a 2.5-GHz bandwidth has been achieved with a resolution of 3 MHz (BT=750) and an effective diffraction efficiency of 5%/Wrf. AOSA dynamic range measurements are analyzed including IM3 intermodulation product investigations with the self-heterodyning technique

Published in:

Ultrasonics Symposium, 1991. Proceedings., IEEE 1991

Date of Conference:

8-11 Dec 1991