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Chinese Optics  > 2025  > Accepted Manuscript
YU Long-kun, XIAO Xin, YU Shi-hao, LI Pan, LUO Zi-ren. Low noise wide tuning 1018 nm DBR narrow linewidth single frequency fiber laser[J]. Chinese Optics. doi: 10.37188/CO.2025-0071
Citation: YU Long-kun, XIAO Xin, YU Shi-hao, LI Pan, LUO Zi-ren. Low noise wide tuning 1018 nm DBR narrow linewidth single frequency fiber laser[J]. Chinese Optics. doi: 10.37188/CO.2025-0071
shu

Low noise wide tuning 1018 nm DBR narrow linewidth single frequency fiber laser

cstr: 32171.14.CO.2025-0071
  • 1.

    College of Information Engineering, Nanchang University, Nanchang 330031, China

  • 2.

    College of Advanced Manufacturing, Nanchang University, Nanchang 330031, China

  • 3.

    Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

  • 4.

    Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China

Funds:  Supported by National Key Research and Development Program (No. 2021YFC2201803); National Natural Science Foundation of China (No. 42165007)
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    Abstract

  • This study addresses the urgent demand for 1018 nm single-frequency seed sources in the field of Rydberg microwave measurements by developing a widely tunable 1018 nm single-frequency fiber laser with a linewidth of 810 Hz and a relative intensity noise below −140 dB/Hz.The laser employs a distributed Bragg reflector (DBR) structure with an 8-mm-long ytterbium-doped fiber and incorporates a high-stability active temperature control system and a piezoelectric ceramic (PZT)-based fast frequency tuning device. The temperature control range was from 10 °C to 80 °C, and the temperature fluctuation of the DBR resonance cavity was only ±0.0005 °C within 2 hours at 25 °C temperature control. After experimental testing, the laser maintains a single longitudinal mode output at 25°C, with a linewidth of 810Hz, a temperature tuning range of more than 0.9 nm, and a fast tuning range of the PZT up to 10 GHz, there is no mode-hopping phenomenon in the tuning process. The relative intensity noise of a single-frequency laser is −150 dB/Hz in the low frequency band of 1 kHz, and below −140 dB/Hz when the frequency is greater than 1.5 MHz. This result shows that the laser output is low noise while achieving wide tuning.

     

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