| 摘要 |
PURPOSE:To detect a theoretical limit sensitivity by converting photoelectrically two outputs of a specified interferometer using a high coherence semiconductor laser as a light source, and thereafter, amplifying them by executing a synchronous detection, feeding back negative one of them to the light source, and deriving a rotational angular velocity by the other output. CONSTITUTION:A beam light of a single longitudinal mode oscillating semiconductor laser element 1 having a high coherence is divided by a beam splitter 4 through an isolator 3, made incident on optical fibers 10, 11 wound in each opposite direction through an optical demultiplexer 9, propagated in each opposite direction and operated as a ring Fabry-Perot interferometer. Subsequently, both the beams are made to pass through an optical demultiplexer 12, led to lock-in amplifiers 19, 20 to which an output of an oscillator 21 has been applied, through photodetectors 17, 18, an output of the amplifier 19 is added to the output of the oscillator 21 by a mixer 23 through a frequency controlling circuit 22 and a negative feedback is applied to the element 1, an output of the amplifier 20 is led to a recorder 24 and a signal being proportional to a rotational angular velocity of the interferometer is detected. |
