Amplitude—phase mode structure of an astigmatic Gaussian beam in ring lasers with a nonplanar four-mirror cavity and an aperture

Broslavets, Yu. Yu.; Zaitseva, T E; Kazakov, A A; Fomichev, A. A.

doi:10.1070/qe2006v036n05abeh013244

Cited by 12 publications

(3 citation statements)

References 1 publication

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“…The ring laser gyroscopes with nonplanar structure can improve the measurement precision without using any additional intra-cavity elements (such as quarter crystal) which can provide the bias of a gyro but induce additional errors (such as the loss, the scattering etc. ), and they are motivating ongoing interest in inertial navigation systems (INS) community [1][2][3][4][5][6][7]. The resonator is the core component of the gyroscope whose measurement precision can be affected by the resonator's structure parameters, and these parameters can also be affected by the temperature, the errors during the processing and adjustment of the resonator, etc.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis on the optical axis perturbation in nonplanar ring resonators

2011

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Based on the ray matrix theory, we theoretically analyzed the property of the optical axis perturbation versus L/r (L means the total length of the resonator and r is the radius of curvature of the mirrors in the resonator) in the nonplanar ring resonators by using statistical method for the first time as we know in this paper. The results show that the root mean square of the optical axis tilt change evidently versus L/r while the optical axis decentration have a subtle change versus L/r for the case that the mirror misalignments are confined in a certain scope and chosen arbitrarily. From the perspective of optical axis perturbation, we can find the configuration parameters with which the optical axis perturbation in the resonator responds violently to the mirror radial displacement or misalignment angle. These interesting findings are important for cavity design, improvement, and alignment of nonplanar ring resonators.

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Section: Introductionmentioning

confidence: 99%

Statistical analysis on the optical axis perturbation in nonplanar ring resonators

2011

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“…However, in engineering use, it is found that the amplitude of output voltage signal of prisms laser gyro is always modulated by dither bias. When the value of modulation, which called modulation depth, is more than 16% of the output signal's amplitude, the accuracy of gyro would be badly influent [5,6] . In 2008, Wan indicate that the mechanical dither of biasing system brings alternating force to optical devices of gyro, thus makes the output light intensity modulated with the same frequency [7] .…”

Section: Introductionmentioning

confidence: 99%

Study on the Output Signal Modulation for Laser Gyro with Mechanical Dither Bias

Yao

Zeng

Cao

2013

AMM

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The amplitude of the output signal of prisms laser gyro with mechanical dither bias is always modulated. Theoretical analysis and experimental research on the ray trajectories, assembly situation and polarized properties of light were carried out. Results show that during the dither bias, the light transmitting route deviation caused by stress induced birefringence of prisms and the relative displacement between the photodetector and output light spot was the main reason responsible for the modulation. Polarized experiment data demonstrated that when the value of polarized power of output light below the 25.5% of that in ideal static situation, the standard error over 0.0337dBm, and the displacement extent of prism is higher than the 53% of radius of the beam waist in gyro cavity, the amplitude modulation extent of gyro output signal would be up to 16%, which badly influences measurement precision of laser gyro. Using the symmetric structure for laser gyro design, adopting prisms material with a suitable refractive index and reducing the photodetector deviation could reduce the extent of output signal's amplitude modulation obviously.

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“…[4,5] In engineering practical use, it is found that the amplitude of an output voltage signal of a prism laser gyro is always modulated by dither bias, which badly influences the measurement accuracy of the gyro. [6,7] Recently, signal process technology and output coupled light detection for prism laser gyros have been studied. In 2008, Wan el al.…”

Section: Introductionmentioning

confidence: 99%

Polarization properties in a prism laser gyro with mechanical dither bias

Cheng-Kang¹,

Zeng²,

Changqing³

2012

Chinese Phys. B

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Theoretical analysis and experimental research on the polarization properties of output light in gyro are carried out to investigate the phenomenon that the amplitude of an output voltage signal is modulated by dither bias in laser gyros consisting of totally reflecting prisms. Taking the effect of prism stress birefringence into account, an analytical formula of the output light intensity in the gyro and the relationship between the polarization parameter and the amplitude modulation of the output signal are obtained and discussed. For the first time, the polarized power value of the output light is adopted as a basis to estimate the output signal amplitude fading extent of laser gyros. Experimental results demonstrate that when the value of polarized power of output light is below 25.5% of that in ideal static case, the standard error is over 0.0337 dBm, and the displacement extent of the prism is higher than 53% of the radius of the beam waist in the gyro cavity, the amplitude modulation extent of gyro output signal can reach up to 16%, which badly influences the measurement accuracy of the laser gyro. Using this polarized power detecting measurement method can repair the gyro immediately during its fabrication process, improve the testing and production efficiency and shorten the product development cycle.

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Amplitude—phase mode structure of an astigmatic Gaussian beam in ring lasers with a nonplanar four-mirror cavity and an aperture

Cited by 12 publications

References 1 publication

Statistical analysis on the optical axis perturbation in nonplanar ring resonators

Statistical analysis on the optical axis perturbation in nonplanar ring resonators

Study on the Output Signal Modulation for Laser Gyro with Mechanical Dither Bias

Polarization properties in a prism laser gyro with mechanical dither bias

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