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Observation of 550 MHz passively harmonic mode-locked pulses at L-band in an er-doped fiber laser using carbon nanotubes film

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Chinese Physics B 2018年第9期27卷 114-118页

作者： Qianqian Huang Chuanhang Zou Tianxing Wang Mohammed A Araimi Aleksey Rozhin Chengbo Mou Key Laboratory of Specialty fiber Optics and Optical Access Networks Shanghai Institute for Advanced Communication and Data ScienceJoint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai UniversityShanghai 200444China Aston Institute of Photonic Technologies（AIPT） Aston UniversityBirminghamB4 7ETUnited Kingdom Nanoscience Research Group Aston UniversityBirminghamB4 7ETUnited Kingdom AI Musanna College of Technology MuladdahAI Musannat？ O.Box 191P.C.314Sultanate of Oman Key Laboratory of Materials for High Power laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

We demonstrate a passively harmonic mode-locked（PHML） fiber laser operating at the L-band using carbon nanotubes polyvinyl alcohol（CNTs-PVA） film. Under suitable pump power and an appropriate setting of the polarization controller（PC）, the 54^（th） harmonic pulses at the L-band are generated with the side mode suppression ratio（SMSR） better than 44 dB and a repetition frequency of 503.37 MHz. Further increasing the pump power leads to a higher frequency of 550 MHz with compromised stability of 38.5 dB SMSR. To the best of our knowledge, this is the first demonstration on the generation of L-band PHML pulses from an er-doped fiber laser based on CNTs.

关键词： passively harmonic mode locking L-band er-doped fiber laser carbon nanotubes film

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Precise determination of characteristic laser frequencies by an er-doped fiber optical frequency comb

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Chinese Physics B 2022年第7期31卷 327-335页

作者： Shiying Cao Yi Han Yongjin Ding Baike Lin Zhanjun Fang Division of Time and Frequency Metrology National Institute of MetrologyBeijing 100029China

Femtosecond optical frequency combs correlate the microwave and optical frequencies accurately and ***,any optical frequency in visible to near-infrared region can be directly traced to a microwave *** 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 *** frequency conversion in the femtosecond optical frequency comb is achieved by combining spectral broadening in a highly nonlinear fiber with a single-point frequencydoubling *** 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 *** 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 *** measurement is further validated by measuring the absolute optical frequency of an iodine-stabilized 532-nm laser and an acetylenestabilized 1542-nm *** results are within the uncertainty range of the international recommended *** 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.

关键词： optical frequency measurement phase lock er-doped fiber laser fiber optical frequency comb

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