The C-II ring laser project

Schneider, Manfred; Rowe, C. H.; Stedman, Geoffrey; Cooper, Steven J.; Schlüter, Wolfgang; Seeger, H.

doi:10.1016/s1464-1895(01)00010-2

Cited by 5 publications

(1 citation statement)

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“…However, this reduction in diameter leads to a decrease in the volume of the laser mode and consequently also significant diffraction losses. Moreover, the fabrication of narrower capillaries in glass-ceramic materials with ultra-low thermal expansion coefficients is extremely challenging, which restricts the manufacturing of large-scale active interferometers based on He-Ne lasers [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Plasma Dynamics in He-Ne Lasers with Different Gas Ratios

Mao,

Hu,

et al. 2024

Photonics

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He-Ne lasers play a crucial role in ultra-precision measurement and optical sensing across various fields. For many applications based on He-Ne lasers, a higher output power is required to enhance the accuracy and signal-to-noise ratios of the associated optical measurements. However, conventional methods to increase the output power by reducing the diameter of the He-Ne laser discharge capillary inevitably result in higher diffraction losses and constrain the lasing performance. Here, we propose an approach to enhance laser pumping efficiency and output power through optimizing the ratios of He and Ne gasses. The validity of our proposal has been confirmed by both numerical simulations of He-Ne laser plasma discharge processes and experimental demonstrations, showing that the optimal gas ratio increases with the capillary diameter and total gas pressure.

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Section: Introductionmentioning

confidence: 99%

Analysis of Plasma Dynamics in He-Ne Lasers with Different Gas Ratios

Mao,

Hu,

et al. 2024

Photonics

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Self-alignment of a compact large-area atomic Sagnac interferometer

et al. 2012

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We report on the realization of a compact atomic Mach-Zehndertype Sagnac interferometer of 13.7 cm length, which covers an area of 19 mm 2 previously reported only for large thermal beam interferometers. According to Sagnac's formula, which holds for both light and atoms, the sensitivity for rotation rates increases linearly with the area enclosed by the interferometer. The use of cold atoms instead of thermal atoms enables miniaturization of Sagnac interferometers without sacrificing large areas. In comparison with thermal beams, slow atoms offer better matching of the initial beam velocity and the velocity with which the matter waves separate. In our case, the area is spanned by a cold atomic beam of 2.79 m s −1 , which is split, deflected and combined by driving a Raman transition between the two hyperfine ground states of 87 Rb in three spatially separated light zones. The use of cold atoms requires a precise angular alignment and high wave front quality of the three independent light zones over the cloud envelope. We present a procedure for mutually aligning the beam splitters at the microradian level by making use of the atom interferometer itself in different configurations. With this method, we currently achieve a sensitivity of 6.1 × 10 −7 rad s −1 Hz −1/2 .

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