| 摘要 |
PROBLEM TO BE SOLVED: To provide a ring laser device and an apparatus and a method for controlling the spectrum line width of ring a laser gyro apparatus which has no need of an optical system for narrowing the band and allows the entire size to be reduced. SOLUTION: In a feedback circuit, a pulse having the most narrow width is selected as a reference among three pulses just preceding a pulse under interest to judge whether the width of the pulse under interest is greater or smaller than that of the reference (Fig. 3, 9). The feedback circuit increase or degreases a current to be injecting to a ring laser according to the difference between the now noticed pulsewidth and the reference pulsewidth (Fig. 3, 10) and takes the pulsewidth of one pulse just preceding an always noticed pulse as a reference pulsewidth so that the pulsewidth of the always noticed pulse may be less than the reference pulsewidth.
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