检索结果-南通市图书馆

optical frequency comb-Based Cavity-Enhanced Fourier-Transform Spectroscopy:Application to Collisional Line-Shape Study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2020年第1期33卷 23-30页

作者： Akiko Nishiyama Grzegorz Kowzan Dominik Charczun Ryszard S.Trawinski Piotr Mas lowski Institute of Physics Faculty of PhysicsAstronomy and InformaticsNicolaus Copernicus University in TorunTorun 87-100Poland

Direct-comb spectroscopy techniques uses optical frequency combs(OFCs)as spectroscopic light *** deliver high sensitivity,high frequency resolution and precision in a broad spectral *** to these features,the field has burgeoned in recent *** this work we constructed an OFC-based cavity-enhanced Fourier-transform spectrometer in the nearinfrared region and used it for a line-shape study of rovibrational transitions of CO perturbed by *** highly sensitive measurements spanned the wavenumber range from 6270 cm^-1 to 6410 cm^-1,which covered both P and R branch of the second overtone band of *** spectrometer delivers high-resolution surpassing the Fourier-transform resolution limit determined by interferogram length,successfully removing ringing and broadening effects caused by instrumental line shape *** instrumental-line-shape-free method and high signal-to-noise ratio in the measurement allowed us to observe collisional effects beyond those described by the Voigt *** retrieved collisional line-shape parameters by fitting the speed-dependent Voigt profile and found good agreement with the values given by precise cavity ring-down spectroscopy measurements that used a continuous-wave laser referenced to a stabilized *** results demonstrate that OFC-based cavity-enhanced Fouriertransform spectroscopy is a strong tool for accurate line-shape studies that will be crucial for future spectral databases.

关键词： Carbon monoxide Spectral lineshapes optical frequency comb Cavity enhanced absorption spectroscopy Fourier-transform spectroscopy

All polarization-maintaining Er:fiber-based optical frequency comb for frequency comparison of optical clocks

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第5期31卷 364-369页

作者：张攀张颜艳李铭坤饶冰洁闫露露陈法喜张晓斐陈群峰姜海峰张首刚 National Time Service Center Chinese Academy of SciencesXi’an 710600China University of the Chinese Academy of Sciences Beijing 100049China Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan 430071China School of Physics Sciences University of Science and Technology of ChinaHefei 230026China

We demonstrate an optical frequency comb(OFC)based on a turnkey mode-locked laser with a figure-9-shape structure and polarization-maintaining fibers,for the comparison of frequency among optical clocks with wavelengths of 698 nm,729 nm,1068 nm,and 1156 *** adopt a multi-branch approach in order to produce high power OFC signals at these specific wavelengths,enabling the signal-to-noise ratio of the beatnotes between the OFC and the clock lasers to exceed30 d B at a resolution bandwidth of 300 k *** approach makes the supercontinuum spectra much easier to be generated than a single branch ***,more out-of-loop fibers degrade the long-term frequency instability due to thermal *** minimize the thermal drift effect,we set the fiber lengths of different branches to be similar,and we stabilize the temperature as *** out-of-loop frequency instability of the OFC due to the incoherence of the multi-branch is about5.5×10^(19) for 4000 s,while the in-loop frequency instability of fceo and that of fbeat are 7.5×10^(18) for 1 s and 8.5×10^(18) for 1 s,*** turnkey OFC meets the requirement for the comparison of frequency between the best optical clocks.

关键词： optical frequency comb nonlinear amplifying loop mirror optical clock frequency instability

Mid-infrared optical frequency comb in the 2.7-4.0μm range via difference frequency generation from a compact laser system

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2020年第4期8卷 17-22页

作者： Lian Zhou Yang Liu Gehui Xie Chenglin Gu Zejiang Deng Zhiwei Zhu Cheng Ouyang Zhong Zuo Daping Luo Bin Wu Kunfeng Chen Wenxue Li Slate Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Science and Technology on Electronic Test&Measurement Laboratory The 41st Research Institute ofCETCQingdao 266000China

We report on the generation of a mid-infrared(mid-IR)frequency comb with a maximum average output power of250 mW and tunability in the 2.7-4.0μm *** approach is based on a single-stage difference frequency generation(DFG)starting from a compact Yb-doped fiber laser *** repetition rate of the near-infrared(NIR)comb is locked at 75 *** phase noise of the repetition rate in the offset-free mid-IR comb system is measured and *** for the intrinsic of NIR comb,environmental noise at low frequency and quantum noise at high frequency from the amplifier chain and nonlinear spectral broadening are the main noise sources of broadening the linewidth of comb teeth,which limits the precision of mid-IR dual-comb spectroscopy.

关键词： fiber laser mid-infrared optical frequency comb

Mid-infrared supercontinuum and optical frequency comb generations in a multimode tellurite photonic crystal fiber

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第9期30卷 248-258页

作者：韩旭韩颖梅超管景昭王彦龚琳苑金辉余重秀 Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province School of Information Science and EngineeringYanshan UniversityQinhuangdao 066004China State Key Laboratory of Information Photonics and optical Communications Beijing University of Posts and Telecommunications(BUPT)Beijing 100876China

We numerically investigate the mid-infrared(MIR)supercontinuum(SC)and SC-based optical frequency comb(OFC)generations when the three optical modes(LP_(01),LP_(02),and LP_(12))are considered in a multimode tellurite photonic crystal fiber(MM-TPCF).The geometrical parameters of the MM-TPCF are optimized to support the multimode propagation and obtain the desired dispersion characteristics of the considered three optical *** the pump pulse with center wavelengthλ=2.5μm,width T=80 fs,and peak power P=18 kW is coupled into the anomalous dispersion region of the LP_(01),LP_(02),and LP_(12)modes of the MM-TPCF,the-40-dB bandwidth of the generated MIR SCs can be up to 2.56,1.39,and 1.12 octaves,respectively,along with good ***,the nonlinear dynamics of the generated SCs are ***,the MIR SCs-based OFCs are demonstrated when a train of 50 pulses at 1-GHz repetition rate is used as the pump source and launched into the MM-TPCF.

关键词： multimode tellurite photonic crystal fiber supercontinuum optical frequency comb mid-infrared spectral region

Tunable optical frequency comb from a compact and robust Er:fiber laser

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2020年第2期8卷 56-61页

作者： Zhiwei Zhu Yang Liu Daping Luo Chenglin Gu Lian Zhou Gehui Xie Zejiang Deng Wenxue Li State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

We report on a compact and robust self-referenced optical frequency comb with a tunable repetition rate,generated by an all-polarization-maintaining(PM)mode-locked Er-doped fiber *** spacing between comb teeth can be tuned above 300 kHz at a repetition rate of 101 *** repetition rate and the carrier-envelope offset of the laser are stabilized separately,and the relative residual phase noises are determined to be 336µrad and 713 mrad(1 Hz-1 MHz).The accurate frequency characteristics and the stable structure show great potential for the use of such a comb in applications of precision measurements.

关键词： optical frequency comb all-polarization-maintaining mode-locking fiber laser

Long-term frequency-stabilized optical frequency comb based on a turnkey Ti:sapphire mode-locked laser

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2021年第12期19卷 51-56页

作者：杨广师浩森姚远于洪浮蒋燕义 Albrecht Bartels 马龙生 State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China Novanta Europe GmbH Garching 85748Germany

We report a long-term frequency-stabilized optical frequency comb at 530–1100 nm based on a turnkey Ti:sapphire modelocked *** the help of a digital controller,turnkey operation is realized for the Ti:sapphire mode-locked *** optimized design of the laser cavity,the laser can be mode-locked over a month,limited by the observation *** combination of a fast piezo and a slow one inside the Ti:sapphire mode-locked laser allows us to adjust the cavity length with moderate bandwidth and tuning range,enabling robust locking of the repetition rate(f_(r)) to a hydrogen *** combining a fast analog feedback to pump current and a slow digital feedback to an intracavity wedge and the pump power of the Ti:sapphire mode-locked laser,the carrier envelope offset frequency(f_(ceo)) of the comb is *** extend the continuous frequency-stabilized time of the Ti:sapphire optical frequency comb to five *** residual jitters of f;and f;are 0.08 m Hz and 2.5 m Hz at 1 s averaging time,respectively,satisfying many applications demanding accuracy and short operation time for optical frequency combs.

关键词： optical frequency comb Ti:sapphire mode-locked laser phase lock optical atomic clock

A long-term frequency-stabilized erbium-fiber-laser-based optical frequency comb with an intra-cavity electro-optic modulator

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第6期24卷 366-370页

作者：张颜艳闫露露赵文宇孟森樊松涛张龙郭文阁张首刚姜海峰 Key Laboratory of Time and frequency Standards National Time Service Center University of the Chinese Academy of Sciences School of Science Xi'an Shiyou University

We demonstrate an optical frequency comb based on an erbium-doped-fiber femtosecond laser with the nonlinear polarization evolution scheme. The repetition rate of the laser is about 209 MHz. By controlling an intra-cavity electro- optic modulator and a piezo-transducer, the repetition rate can be stabilized with a high-bandwidth servo in a frequency range of 3 kHz, enabling long-term repetition rate phase-locking. The in-loop frequency stability of repetition rate is about 1.6× 10-13 in an integration time of 1 s, limited by the measurement system; and it is inversely proportional to integration time in the short term. Furthermore, using a common path f-2f interferometer, the carrier envelope offset frequency of the comb is obtained with a signal-to-noise ratio of 40 dB in a 3-MHz resolution bandwidth. Stabilized cartier envelope offset frequency exhibits a deviation of 0.6 mHz in an integration time of 1 s.

关键词： optical frequency comb fiber laser frequency stabilization frequency instability

A diode laser spectrometer at 634 nm and absolute frequency measurements using optical frequency comb

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第4期18卷 1409-1412页

作者：伊林袁杰齐向晖陈文兰周大伟周通周小计陈徐宗 School of Electronics Engineering and Computer Science Peking University

This paper reports that two identical external-cavity-diode-laser （ECDL） based spectrometers are constructed at 634nm referencing on the hyperfine B-X transition R（80）8-4 of 127I2. The lasers are stabilized on the Doppler-free absorption signals using the third-harmonic detection technique. The instability of the stabilized laser is measured to be 2.8 × 10^-12 （after 1000 s） by counting the beat note between the two lasers. The absolute optical frequency of the transition is, for the first time, determined to be 472851936189.5 kHz by using an optical frequency comb referenced on the microwave caesium atomic clock. The uncertainty of the measurement is less than 4.9 kHz.

关键词： frequency standard optical frequency comb absolute frequency measurement atomicclock

Robust optical frequency comb Generation Based on optical Parametric Oscillation in a High-index Micro-ring Resonator

在线全文

学校读者我要写书评

暂无评论

Robust Optical Frequency Comb Generation Based on Optical Pa...