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The phase modulation of a laser beam in single mode fiber by pre sure-induced refractive index variations produced by an acoustic wave propagating in a fluid has been studied in detail by many workers. This paper describes the phase modulation principle of a laser beam in multimode fiber by presure-induced refractive index variations produ ted by an acoustical wave,and it’s experimental results. The construction of producing the fixed phase difference and the modulation index in a multimode fiber is different from in a single mode fiber.But both results of sound detection are the same. 相似文献
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声波在液体中传播时,声压的变化会引起置于声场中的单模光导纤维折射率和尺寸的变化,进而使其中激光束的相位被声压所调制。这一现象,已被许多学者研究过、。本文则叙述多模光纤在声压作用下,激光束相位调制原理及其实验结果。在声压作用下,多模光纤产生固定相位差和调制系数(v)的机制与单模光纤是不同的。但是,两者声探测的结果倒是一样的。 相似文献
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