動作点自動設定型安定化横ゼーマンレーザー
1980 年 9 巻 5 号 p. 296-302
詳細
1980 年 9 巻 5 号 p. 296-302
The longitudinal modes of a internal mirror He-Ne laser was collapsed into one by a transverse magnetic field. The laser frequency was then stabilized by referring to the frequency of the beat of light components which vibrate in and perpendicular to the transverse magnetic field (intramode beat frequency) The frequency fluctuation of the laser was evaluated by optical beating with an iodine stabilized laser of the National Research Laboratory of Metrology. The fluctuation was proved to be smaller than 1×10-10 at accumulation period of 3×10-2 sec by Allan variance. Two types of developments were introduced to the regulation system, and the results were evaluated by Allan variance analysis of the residual signal. The frequency fluctuation of the laser stabilized by the air tight system was 7×10-11, and that of the laser stabilized by the automatic resetting system, which adjusts the working point of a proportional regulation system so as to keep the intramode beat frequency measured by a quartz controlled counter to a preset digital number, was 2×10-11.
