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Precise determination of characteristic laser frequencies by an Er-doped fiber optical frequency comb 被引量:3
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作者 Shiying Cao Yi Han +2 位作者 Yongjin Ding Baike Lin Zhanjun Fang 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第7期327-335,共9页
Femtosecond optical frequency combs correlate the microwave and optical frequencies accurately and coherently.Therefore,any optical frequency in visible to near-infrared region can be directly traced to a microwave fr... Femtosecond optical frequency combs correlate the microwave and optical frequencies accurately and coherently.Therefore,any optical frequency in visible to near-infrared region can be directly traced to a microwave frequency.As a result,the length unit“meter”is directly related to the time unit“second”.This paper validates the capability of the national wavelength standards based on a home-made Er-doped fiber femtosecond optical frequency comb to measure the laser frequencies ranging from visible to near-infrared region.Optical frequency conversion in the femtosecond optical frequency comb is achieved by combining spectral broadening in a highly nonlinear fiber with a single-point frequencydoubling scheme.The signal-to-noise ratio of the beat notes between the femtosecond optical frequency comb and the lasers at 633,698,729,780,1064,and 1542 nm is better than 30 d B.The frequency instability of the above lasers is evaluated by using a hydrogen clock signal with a instability of better than 1×10^(-13)at 1-s averaging time.The measurement is further validated by measuring the absolute optical frequency of an iodine-stabilized 532-nm laser and an acetylenestabilized 1542-nm laser.The results are within the uncertainty range of the international recommended values.Our results demonstrate the accurate optical frequency measurement of lasers at different frequencies using the femtosecond optical frequency comb,which is not only important for the precise and accurate traceability and calibration of the laser frequencies,but also provides technical support for establishing the national wavelength standards based on the femtosecond optical frequency comb. 展开更多
关键词 optical frequency measurement phase lock Er-doped fiber laser fiber optical frequency comb
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First Evaluation and Frequency Measurement of the Strontium Optical Lattice Clock at NIM 被引量:14
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作者 林弋戈 王强 +7 位作者 李烨 孟飞 林百科 臧二军 孙震 房芳 李天初 方占军 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第9期17-20,共4页
An optical lattice clock based on 87Sr is built at National Institute of Metrology (NIM) of China. The systematic frequency shifts of the clock are evaluated with a total uncertainty of 2.3×10-16. To measure it... An optical lattice clock based on 87Sr is built at National Institute of Metrology (NIM) of China. The systematic frequency shifts of the clock are evaluated with a total uncertainty of 2.3×10-16. To measure its absolute frequency with respect to NIM's cesium fountain clock NIM5, the frequency of a flywheel H-maser of NIM5 is transferred to the Sr laboratory through a 50-kin-long fiber. reference frequency of this H-maser, is used for the optical this Sr clock is measured to be 429228004229873.7(1.4)Hz. A fiber optical frequency comb, phase-locked to the frequency measurement. The absolute frequency of 展开更多
关键词 AOM First Evaluation and frequency Measurement of the Strontium optical Lattice Clock at NIM
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Optical frequency transfer link with remote site compensation
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作者 Qi Zang Xiang Zhang +9 位作者 Xue Deng Qian Zhou Dan Wang Yucan Zhang Jing Gao Dongdong Jiao Guanjun Xu Tao Liu Ruifang Dong Shougang Zhang 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第9期68-73,共6页
In this paper,we present a remote time-base-free technique for a coherent optical frequency transfer system via fiber.At the remote site,the thermal noise of the optical components is corrected along with the link pha... In this paper,we present a remote time-base-free technique for a coherent optical frequency transfer system via fiber.At the remote site,the thermal noise of the optical components is corrected along with the link phase noise caused by environmental effects.In this system,a 1×2 acousto-optic modulator(AOM)is applied at the remote site,with the first light being used to eliminate the noise of the remote time base and interface with remote users while the zeroth light is used to establish an active noise canceling loop.With this technique,a 10 MHz commercial oscillator,used as a time base at the remote site,does not contribute to the noise of the transferred signal.An experimental system is constructed using a 150 km fiber spool to validate the proposed technique.After compensation,the overlapping Allan deviation of the transfer link is 7.42×10^(-15)at 1 s integration time and scales down to 1.07×10^(-18)at 10,000 s integration time.The uncertainty of the transmitted optical frequency is on the order of a few 10-19.This significantly reduces the time-base requirements and costs for multi-user applications without compromising transfer accuracy.Meanwhile,these results show great potential for transferring ultra-stable optical frequency signals to remote sites,especially for point-to-multi-users. 展开更多
关键词 optical frequency measurement remote site compensation ultra-stable laser fiber network
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Precision frequency measurement of 1^S0–3^P1 intercombination lines of Sr isotopes 被引量:3
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作者 刘辉 高峰 +6 位作者 王叶兵 田晓 任洁 卢本全 徐琴芳 谢玉林 常宏 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第1期208-215,共8页
We report on frequency measurement of the intercombination(5s^2)^1S0–(5s5p)^3P1transition of the four natural isotopes of strontium, including88^Sr(82.58%),87^Sr(7.0%),86^Sr(9.86%), and84^Sr(0.56%). A nar... We report on frequency measurement of the intercombination(5s^2)^1S0–(5s5p)^3P1transition of the four natural isotopes of strontium, including88^Sr(82.58%),87^Sr(7.0%),86^Sr(9.86%), and84^Sr(0.56%). A narrow-linewidth laser that is locked to an ultra-low expansion(ULE) optical cavity with a finesse of 12000 is evaluated at a linewidth of 200 Hz with a fractional frequency drift of 2.8×10^-13 at an integration time of 1 s. The fluorescence collector and detector are specially designed, based on a thermal atomic beam. Using a double-pass acousto-optic modulator(AOM) combined with a fiber and laser power stabilization configuration to detune the laser frequency enables high signal-to-noise ratios and precision saturated spectra to be obtained for the six transition lines, which allows us to determine the transition frequency precisely.The optical frequency is measured using an optical frequency synthesizer referenced to an H maser. Both the statistical values and the final values, including the corrections and uncertainties, are derived for a comparison with the values given in other works. 展开更多
关键词 optical frequency measurement STRONTIUM intercombination transition
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Non-uniform strain measurement along a f iber Bragg grating using optical frequency domain reflectometry 被引量:1
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作者 朱东方 张东生 +2 位作者 樊鹏 李立彤 郭永兴 《Chinese Optics Letters》 SCIE EI CAS CSCD 2013年第10期23-28,共6页
A novel method of measuring non-uniform strain along a fiber Bragg grating(FBG) using optical frequency domain reflectometry(OFDR) is proposed and experimentally demonstrated. This method can overcome the problems of ... A novel method of measuring non-uniform strain along a fiber Bragg grating(FBG) using optical frequency domain reflectometry(OFDR) is proposed and experimentally demonstrated. This method can overcome the problems of traditional non-uniform strain measurement methods for FBGs, i.e., the likelihood of chirping and multiple peaking in the spectrum when FBG is subjected to inhomogeneous strain fields. Wavelength interrogation is realized by OFDR with a narrow-line-width tunable laser as the optical source. When non-uniform strain distributions along areas adjacent to structural damage are measured by this method, good agreement is obtained between measurements and theoretical simulation results. 展开更多
关键词 FBG OFDR Non-uniform strain measurement along a f iber Bragg grating using optical frequency domain reflectometry
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