Topic
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.
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TL;DR: In this article , the relationship among the insertion loss, coupling coefficient, and unit length loss of the cavity fiber and the resonance depth, full width at half maximum, and fineness of the transmission spectrum line are analyzed.
Abstract: As a new inertial navigation device, the resonant optical gyroscope offers advantages that include high precision, device integration, impact resistance, and solid-state realization. This device will be widely used in future military and civil applications. Following consideration of the factors that affect accuracy improvement of resonant fiber optic gyroscopes, the relationships among the insertion loss, coupling coefficient, and unit length loss of the cavity fiber and the resonance depth, full width at half maximum, and fineness of the transmission spectrum line are analyzed. To improve the transmission spectrum’s resonance depth, the coupling coefficient should be controlled at 0.2 and the optical coupler insertion loss should be reduced as far as possible. Additionally, the laser linewidth effects on the transmission spectrum and the limit sensitivity are analyzed. It is found that if the laser linewidth of the resonant optical gyroscope is less than 100 kHz, it can meet the resonance depth requirements, thus, providing a technical reference for further research into integrated optical waveguide gyroscopes.
24 Jan 2023
11 Jul 2022
TL;DR: In this paper , a ring laser gyroscope (RLG) was used for rotational seismology and the long term stability was shown to be 3~nanorad/s.
Abstract: This work demonstrates that a middle size ring laser gyroscope (RLG) can be a very sensitive and robust instrument for rotational seismology, even if it operates in a quite noisy environment. The RLG has a square cavity, $1.60\times 1.60$ m$^2$, and it lies in a plane orthogonal to the Earth rotational axis. The Fabry-Perot optical cavities along the diagonals of the square were accessed and their lengths were locked to a reference laser. Through a quite simple locking circuit, we were able to keep the sensor fully operative for 14 days. The obtained long term stability is of the order of 3~nanorad/s and the short term sensitivity close is to 2~nanorad/s$\cdot$Hz$^{-1/2}$. These results are limited only by the noisy environment, our laboratory is located in a building downtown.
30 May 2022
TL;DR: In this article , a four-frequency Zeeman laser gyroscope with a non-planar cavity in the form of a regular tetrahedron with a cavity length of 28 cm is presented.
Abstract: This paper presents the results of our work on a four-frequency Zeeman laser gyroscope with a non-planar cavity in the form of a regular tetrahedron with a cavity length of 28 cm. A new physical principle for stabilizing the cavity length based on measuring the beat signal of orthogonal polarization modes is presented. An analysis of various other meth-ods for stabilizing the cavity length and ensuring the lasing frequency stability is made. A method for improving the sub-traction of the influence of external magnetic fields due to the optimal choice of the perimeter control system operation point is shown. We also analyzed the factors influencing the possibility of further improvement of measurement accuracy in the created four-frequency laser gyroscope.
03 Jan 2023
TL;DR: In this paper , the GINGERINO active ring laser prototype upper limiting noise was shown to have a sensitivity close to 10$−15−1 rad/sec, which is more than a factor 10 better than the theoretical prediction so far accounted for ring laser shot-noise.
Abstract: Absolute angular rotation rate measurements with sensitivity better than prad/sec would be beneficial for fundamental science investigations. On this regard, large frame Earth based ring laser gyroscopes are top instrumentation as far as bandwidth, long term operation and sensitivity are concerned. Their classical sensitivity limit is given by the shot-noise of the two beams counter propagating inside the cavity usually considered as two independent propagating modes. Thus, it is given by the sum of the shot-noise associated to each beam. Here we prove that the GINGERINO active ring laser prototype upper limiting noise allows an unprecedented sensitivity close to 10$^{-15}$ rad/sec. This is more than a factor 10 better than the theoretical prediction so far accounted for ring lasers shot-noise.