Experimental observation of reflected acoustic beam tilting with temperature in quasi-collinear acousto-optic filters

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-02-25 DOI:10.1016/j.apacoust.2025.110632

Sergey N. Mantsevich , Ekaterina I. Kostyleva , Konstantin B. Yushkov , Vladimir Ya. Molchanov

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Abstract

This paper is devoted to the experimental investigation of temperature influence on the acoustic beam reflection in quasi-collinear acousto-optic (AO) tunable filters, fabricated on the base of paratellurite crystal. Such AO devices apply acoustic beam reflection from the input optical facet in such a way that the reflected beam Poynting vector is collinear to the incident optical radiation wave vector. This allows achieving abnormally high AO interaction length and consequently both high diffraction efficiency and spectral resolution and to realize the multi-frequency diffraction applied for ultrashort laser pulse spectrum and phase control. Due to the acoustic power absorption, the significant heating of AO crystal near the reflecting facet is observed.

The crystal heating affects the acoustic beam reflection condition through the ultrasound velocity variation and causes the reflected beam tilt from the initially chosen direction. The original method of reflected ultrasound beam structure measurement is proposed. The acoustic beams were visualized for various temperatures in two different quasi-collinear AO filters.

The temperature variation range typical for the quasi-collinear AO filters in multi-frequency operation causes the beam tilt of about 1-2 degrees, depending on the reflection geometry. The beam tilt influence on the quasi-collinear AO filter transmission functions was also studied. It is shown that the observed tilt significantly affects both the AO diffraction efficiency and the transmission functions, changing their shape and bandwidth.

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来源期刊

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

期刊介绍： Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems. Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.