Ms. Tiantian Shi Profile

Tiantian Shi

at Peking Univ

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Proceedings Article | 11 October 2024 Paper

A Faraday laser with frequency automatically trace to Cs-D2 transition

Huifang Hou, Zhiyang Wang, Zijie Liu, Tiantian Shi, jinbiao chen

Proceedings Volume 13287, 132870X (2024) https://doi.org/10.1117/12.3038938

KEYWORDS: Cesium, Laser frequency, Semiconductor lasers, Magnetism, Laser stabilization, Transmittance, Optical filters, Quantum frequencies, Diodes, Temperature metrology

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We constructed an 852nm Faraday laser using a Faraday anomalous dispersion optical filter (FADOF) of cesium as the frequency-selective element. Utilizing the Faraday effect, under a magnetic field strength of 1000G, the center frequency of the FADOF transmission spectrum is optimized to correspond with the wavelength of the Cs transition by precisely adjusting the temperature of the Cs vapor cell. When the cell temperature is 61℃, the peak transmission frequency of FADOF is the same as the 6S_1/2(F=4)-6P_3/2 transition frequency of cesium atoms. The transmission spectrum of FADOF has a maximum transmittance of 80% and a Doppler-broadened transmittance bandwidth of 2.25GHz. The output wavelength is stabilized at 852.356nm within the transmission frequency region. When the laser diode (LD) current and temperature change from 70 to 150mA and 15 to 30℃, its wavelength fluctuations are within 2pm and 1pm, respectively. In summary, we investigate a Faraday laser based on a FADOF with a specific parameter as the frequency-selective element, whose output wavelength can be automatically traced to the atomic transition. Therefore, the Faraday laser can be widely used due to its excellent robustness to fluctuating diode parameters.

Proceedings Article | 2 December 2020 Paper

Specificity of saturated absorption spectroscopy on Cs D2 line induced by a multi-wavelength laser

Pengyuan Chang, Duo Pan, Dayong Chen, Jun Pan, Chunlai Li, Tiantian Shi, Guoqing Hu, Jin He, Jingbiao Chen

Proceedings Volume 11717, 1171717 (2020) https://doi.org/10.1117/12.2586424

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We present a study of the saturated absorption spectroscopy on cesium D2 line (6S_1/2F = 4 → 6P_3/2) induced by a multiwavelength laser and its specificity. Compared with the traditional saturated absorption spectroscopy induced by single-frequency laser, the major difference is that the peak amplitude can reach more than half of the Doppler background, and the second is that the number of the saturated absorption peaks is increased and not in the same direction, the line shape and amplitude of the spectrum change with the magnetic field. The frequency components of the multi-wavelength laser need to be studied in order to further analyze the principle of generation of the spectrum. The cesium atom laser spectroscopy induced by this unique multi-wavelength laser can be used for laser frequency stabilization. The interaction of multi-wavelength laser and atom can increase the utilization rate of the atoms, increase the signal amplitude, help to improve the signal-to-noise ratio, and then improve the frequency stability of lasers. In this experiment, the multiwavelength laser spectroscopy induced by the superposition of saturation effect, absorption effect, optical pumping effect and other physical effect is of great interest in high resolution laser spectroscopy and laser frequency stabilization.

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