Abstract
We have investigated deflection efficiency of thin-film acoustooptic light deflectors for a narrow guided optical beam (GOB). Dependences of the maximum deflection efficiency ηmax on spreading angle (δθ) of such a GOB and that (δΦ) of a surface acoustic wave were revealed experimentally and theoretically for He–Ne and GaAlAs double heterostructure (DH) lasers. ηmax is drastically reduced when δθ increases to δΦ; and ηmax increases with increasing δΦ for fixed δθ. Even for a DH laser having a spectral halfwidth of about 63 Å, the spectral distribution scarcely affects ηmax in this deflector. Some restrictions are pointed out in designing the deflector with higher ηmax for a narrow GOB.
© 1977 Optical Society of America
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