In this letter, the relationship between the change of the closed-loop optical path and the movement of two adjacent spherical mirrors in ring laser gyros is investigated by matrix optical approach. When one spherical mirror is pushed forward and the other is pulled backward to maintain the total length of the closed-loop optical path constant, an equivalent rotation of the closed-loop optical path is found for the first time. Both numerical simulations and experimental results show the equivalent rotation rate is proportional to the velocities of the mirrors' movement.
A miniaturized HeNe laser with intensity and frequency simultaneously stabilized is described. The laser uses a monoblock glass ceramics as its tube to construct an improved steady structure. The closed loop cavity length control system stabilizes its frequency and the discharge current regulating system stabilizes its intensity. The electronic system integrating power supply and stabilization system is designed within two small circuit boards. The laser tube and circuit boards are assembled into a small package with dimensions of 180 mm×100 mm×150 mm. The laser outputs s-polarized light at wavelength of 632.99 nm with power of 0.44 mW. Test results show that its frequency stability can reach 8.4×10(-11) (1s Allan variance over 3 h) and frequency reproducibility at 1.3×10(-8). The laser's intensity stability is 0.011% over 9 h.
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