Absolute Angular Displacement Determination Based on Laser-Frequency Splitting Technology

Ren, Cheng; Yang, Xingtuan; Zhang, Shulian

doi:10.1088/0256-307x/29/5/054204

Cited by 3 publications

(1 citation statement)

References 17 publications

(17 reference statements)

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“…Compared with the He-Ne dual-frequency laser, this laser is of some distinct advantages, such as allsolid-state structure, compact size, high output power and long lifetime. These characters have it widely applied to the measurements of velocity [1], vibration [2], displacement [3], force [4], angular displacement [5], and so on.…”

Section: Introductionmentioning

confidence: 99%

Study on mechanism of amplitude fluctuation of dual-frequency beat in microchip Nd:YAG laser

Chen¹,

Tan²,

Zhang³

et al. 2016

J. Opt.

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In the laser heterodyne interferometry based on the microchip Nd:YAG dual-frequency laser, the amplitude of the beat note periodically fluctuates in time domain, which leads to the instability of the measurement. On the frequency spectrums of the two mono-frequency components of the laser and their beat note, several weak sideband signals are observed on both sides of the beat note. It is proved that the sideband frequencies are associated with the relaxation oscillation frequencies of the laser. The mechanism for the relaxation oscillations inducing the occurrence of the sideband signals is theoretically analyzed, and the quantitative relationship between the intensity ratio of the beat note to the sideband signal and the level of the amplitude fluctuation is simulated with the derived mathematical model. The results demonstrate that the periodical amplitude fluctuation of the beat note is actually induced by the relaxation oscillation. And the level of the amplitude fluctuation is lower than 10% when the intensity ratio is greater than 32 dB. These conclusions are beneficial to reduce the amplitude fluctuation of the microchip Nd:YAG dual-frequency laser and improve the stability of the heterodyne interferometry.

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Section: Introductionmentioning

confidence: 99%

Study on mechanism of amplitude fluctuation of dual-frequency beat in microchip Nd:YAG laser

Chen¹,

Tan²,

Zhang³

et al. 2016

J. Opt.

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Laser diode side-pumped Nd:YVO_4 microchip laser with film-etched microcavity mirrors

Niu

Chen

et al. 2017

J. Opt. Soc. Am. A

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Microchip lasers are applied as the light sources on various occasions with the end-pumping scheme. However, the vibration, the temperature drift, or the mechanical deformation of the pumping light in laser diodes in the end-pumping scheme will lead to instability in the microchip laser output, which causes errors and malfunctioning in the optic systems. In this paper, the side-pumping scheme is applied for improving the disturbance-resisting ability of the microchip laser. The transverse mode and the frequency purity of the laser output are tested. To ensure unicity in the frequency of the laser output, numerical simulations based on Fresnel-Kirchhoff diffraction theory are conducted on the parameters of the microchip laser cavity. Film-etching technique is applied to restrain the area of the film and form the microcavity mirrors. The laser output with microcavity mirrors is ensured to be in single frequency and with good beam quality, which is significant in the applications of microchip lasers as the light sources in optical systems.

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Consistency of splitting frequency difference with longtudinal modes spacing variation in Zeeman dual-frequency laser

山东大学¹,

山东大学空间科学研究院²

2021

Acta Phys. Sin.

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Phase anisotropy in laser resonant cavity will bring about an influence on laser frequency and polarization, such as laser frequency splitting, of which the frequency difference is determined by their introduced phase retardation. For a helium-neon laser with a small phase retardation in the cavity, the two split modes are very close to each other whose burned holes are overlapped. Then only one mode oscillates while the other is always in lock-in state due to strong mode competition, which forms hidden frequency split. Meanwhile the spacing between adjacent longitudinal modes deviates from original value and produces a certain variation equal to twice the hidden splitting frequency difference. As a result the longitudinal modes spacing variation is dominated by the phase retardation. On the other hand, by applying transverse magnetic field to a laser tube along the polarization direction, the neon atoms will undergo transverse Zeeman effect and be divided into two groups to provide the gain for polarized light beams parallel to the magnetic field and perpendicular to the magnetic field respectively. Then the laser mode competition is greatly weakened so that the two split modes can oscillate simultaneously to obtain the frequency difference. In order to make profound study of the consistency between longitudinal mode spacing variation and splitting mode frequency difference in the presence of transverse magnetic field, the samples of tilted quartz plate or half wave plate is placed into laser cavity to produce phase retardation. By the two mentioned methods, the splitting frequency difference varying with phase retardation of samples is deduced to make a comparison. Two measurements show that the average relative deviation is less than 1%, while the experimental results accord with theoretical analyses quite well. In this way splitting frequency difference of Zeeman dual-frequency laser can be determined accurately, and a new method to measure the phase retardation of half wave plate is provided.

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Absolute Angular Displacement Determination Based on Laser-Frequency Splitting Technology

Cited by 3 publications

References 17 publications

Study on mechanism of amplitude fluctuation of dual-frequency beat in microchip Nd:YAG laser

Study on mechanism of amplitude fluctuation of dual-frequency beat in microchip Nd:YAG laser

Laser diode side-pumped Nd:YVO_4 microchip laser with film-etched microcavity mirrors

Consistency of splitting frequency difference with longtudinal modes spacing variation in Zeeman dual-frequency laser

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