Comparison of two modes of Bragg diffraction on broadband ultrasound

V. E. Pozhar; M. M. Mazur; A. S. Machikhin

doi:10.1117/12.2502414

14 November 2018 Comparison of two modes of Bragg diffraction on broadband ultrasound

V. E. Pozhar, M. M. Mazur, A. S. Machikhin

Proceedings Volume 10815, Optical Design and Testing VIII; 108151I (2018) https://doi.org/10.1117/12.2502414
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

Two methods of AOTF bandpass broadening are compared: multi-frequency generation and frequency-modulated ultrasound. The principal goal is to increase the optical throughput and signal-to-noise ratio of AOTF-based spectrometers. We present a simplified model of linear frequency-modulated mode, which make easy qualitative analysis of that operation model. Using the model we derived exact formulas for AOTF field-of-view and the total optical throughput raise with bandpass broadening and we found that AOTF field-of-view is much larger in the linear frequency modulation (LFM) mode. We conclude that for imaging applications of AOTF-based spectral elements, LFM mode of bandwidth control is more efficient than multi-frequency mode.

Citation Download Citation

V. E. Pozhar, M. M. Mazur, and A. S. Machikhin "Comparison of two modes of Bragg diffraction on broadband ultrasound", Proc. SPIE 10815, Optical Design and Testing VIII, 108151I (14 November 2018); https://doi.org/10.1117/12.2502414

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