Nomura Y, Nunoshita M, Nakayama T
Appl Opt. 1977 Oct 1;16(10):2729-31. doi: 10.1364/AO.16.002729.
We have investigated deflection efficiency of thin-film acoustooptic light deflectors for a narrow guided optical beam (GOB). Dependences of the maximum deflection efficiency eta(max) on spreading angle (deltatheta) of such a GOB and that (deltaPhi) of a surface acoustic wave were revealed experimentally and theoretically for He-Ne and GaAlAs double heterostructure (DH) lasers. eta(max) is drastically reduced when deltatheta increases to deltaPhi; and eta(max) increases with increasing deltaPhi for fixed deltatheta. Even for a DH laser having a spectral halfwidth of about 63 A, the spectral distribution scarcely affects eta(max) in this deflector. Some restrictions are pointed out in designing the deflector with higher eta(max) for a narrow GOB.
我们研究了窄引导光束（GOB）的薄膜声光偏转器的偏转效率。对于氦氖激光器和 GaAlAs 双异质结构（DH）激光器，通过实验和理论揭示了最大偏转效率 η(max) 与这种 GOB 的发散角（Δθ）以及表面声波的发散角（ΔΦ）之间的关系。当 Δθ 增大到 ΔΦ 时，η(max) 会急剧降低；对于固定的 Δθ，η(max) 会随着 ΔΦ 的增加而增加。即使对于光谱半高宽约为 63 Å 的 DH 激光器，光谱分布在该偏转器中对 η(max) 的影响也很小。指出了在设计用于窄 GOB 且具有更高 η(max) 的偏转器时的一些限制。
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