Ring laser gyroscope

About: Ring laser gyroscope is a research topic. Over the lifetime, 2070 publications have been published within this topic receiving 18609 citations. The topic is also known as: Sagnac interferometer.

Stabilisation of fibre-amplifier/source gyroscope by optimum modulation amplitude tracking

Abstract: A new stabilisation scheme for an open-loop gyroscope employing an erbium-doped fibre amplifier/source is proposed and demonstrated. A two-frequency modulation scheme is used to extract an error signal, which is necessary for keeping the quasi-DC component of the feedback signal power at a constant level for a varying rotation rate. By active tracking of the optimum modulation condition, a stable gyroscope output with suppressed distortion is obtained.

Ring Laser Resonators

Abstract: The ring cavity gives flexibility in resonator design, such as ability to incorporate long collimated beam sections with large beam diameters in order to extract power from large volumes of laser media. Particular attention is paid to the non–planar ring resonator because of its novel features and importance in recent applications in the ring laser gyroscope and in diode–pumped non–planar solid–state ring lasers. For the ring resonator the beam meets the confining mirror at an oblique angle, the radius of the beam in the plane of the ring and normal to it being different. The ring resonator differs from the linear laser in resonant conditions for the frequencies of the longitudinal and transverse modes. In the ring resonator, the electric field distribution is reproduced after one complete transit. The non-planar ring laser cavity with integral optical diode has been used to generate a single unidirectional mode. The geometry of the non-planar ring is chosen to give a small rotation angle.

Investigation on output variations of ring laser gyroscope in the presence of non-ideal sinusoidal dithering

Abstract: Frequency lock-in is the most principal phenomenological feature to be characterized and eliminated for the development of high precision ring laser gyroscope (RLG). As an effective method to solve the lock-in induced problem, sinusoidal dithering by mechanical manner has been proposed and has widely used successfully to date. However, in real applications, pure-sinusoidal dithering is nearly impossible, so additional nonlinear factors should be considered for modeling of dithered RLG. In this work, output variations of RLG in the presence of non-ideal sinusoidal dithering are investigated by performing numerical experiments.