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- 实验方案
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Wavelength-tunable single-frequency ytterbium-doped fiber laser based on a double-circulator interferometer
摘要： We reported a novel type of wavelength-tunable single-frequency ytterbium-doped fiber laser based on a double-circulator compound cavity and a section of unpumped ytterbium-doped fiber. The multi-longitudinal-mode oscillations are suppressed by the double-circulator structure and the single frequency operation is obtained finally by the standing wave grating in the unpumped ytterbium-doped fiber. The central wavelength of the laser beam is selected by a tunable filter ranging from 1040 nm to 1080 nm. The results show that the side mode suppression ratio in this range is greater than 47 dB and the maximum value is 58 dB at 1070.06 nm. The observed maximum wavelength fluctuation and power variation at 1060 nm are 0.012 nm and 0.22 dB during 1 h, respectively. The mean value of the linewidth in this range is 2.82 kHz and the minimum value of the linewidth at 1060 nm is 2.38 kHz. The relaxation oscillation frequency is right on 94 kHz.
关键词： single frequency,double-circulator interferometer,saturable absorber,wavelength tunable
更新于2025-11-28 14:24:03
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High-Resolution Temperature Sensor Based on Single-Frequency Ring Fiber Laser via Optical Heterodyne Spectroscopy Technology
摘要： We demonstrate a high-resolution temperature sensor based on optical heterodyne spectroscopy technology by virtue of the narrow linewidth characteristic of a single-frequency fiber laser. When the single-frequency ring fiber laser has a Lorentzian-linewidth <1 kHz and the temperature sensor operates in the range of 3?85 ?C, an average sensitivity of 14.74 pm/?C is obtained by an optical spectrum analyzer. Furthermore, a resolution as high as ~5 × 10?3 ?C is demonstrated through optical heterodyne spectroscopy technology by an electrical spectrum analyzer in the range of 18.26–18.71 ?C with the figure of merit up to 3.1 × 105 in the experiment.
关键词： fiber optics sensors,high resolution,heterodyne spectroscopy,single-frequency laser
更新于2025-11-28 14:24:03
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Single-frequency fibre laser at 1030?nm based on gain bandwidth compression
摘要： We demonstrate a single-frequency linear cavity fiber laser at 1030 nm with a distributed Bragg reflector cavity configuration. Despite the fact that the combination of the cavity length of the fiber laser and the reflection band of the output FBG cannot satisfy the condition of single-longitudinal mode oscillation, the single-frequency lasing is still realized by the proper temperature control of two FBGs to narrow the gain bandwidth. Under the respective temperature of two FBGs of 43.4 °C and 9 °C, the laser linewidth of around 9.6 kHz is achieved at a pump power of 113 mW. The relative noise intensity for frequencies of above 1.5 MHz is about ?140 dB Hz?1. The maximum output power of 126.2 mW is obtained with the slope efficiency of about 28%.
关键词： fibre laser,single-frequency,gain bandwidth compression,distributed Bragg reflector
更新于2025-11-28 14:23:57
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Demonstration of linewidth measurement based on phase noise analysis for a single frequency fiber laser in the 2 <i>μ</i> m band
摘要： Linewidth measurement based on phase noise analysis using a 3 × 3 coupler has been applied in the 1550 nm band. One of the obvious advantages of this method compared with the common delayed self-heterodyne method is the low loss caused by the short delay line used. Taking full advantage of this particular characteristic, the linewidth of the single frequency (SF) fiber laser in the 2 μm band can also be measured. However, a specifically experimental demonstration of this method in the 2 μm band is absent to date. In this paper, a high-performance SF thulium-doped fiber laser (TDFL) was proposed and employed for the demonstration. The TDFL operates at the center wavelength of 1942.03 nm with high stability. By means of the phase noise analysis-based linewidth measurement system with a fiber delay line of only 50 m, the linewidth of the proposed TDFL is successfully measured. When the measuring time is 0.001 s, the linewidth is ~47 kHz. Furthermore, the noise characteristics of the SF laser were simultaneously studied by this method.
关键词： 2 μm band,phase noise,single frequency fiber laser,linewidth measurement
更新于2025-11-28 14:23:57
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20?W 1952?nm tandem hybrid single and double clad TDFA
摘要： A simple engineering design is important for achieving high Thulium-doped ampli?er (TDFA) performance such as good power conversion, low noise ?gure (NF), scalable output power, high gain, and stable operation over a large dynamic range. In this paper we report the design, performance, and simulation of two stage high-power 1952 nm hybrid single and double clad TDFAs. The ?rst stage of our hybrid ampli?er is a single clad design, and the second stage is a double clad design. We demonstrate TDFAs with an output power greater than 20 W with single-frequency narrow linewidth (i.e. MHz) input signals at both 1952 and 2004 nm. An optical 10 dB bandwidth of 80 nm is derived from the ASE spectrum. The power stage is constructed with 10 μm core active ?bers showing a maximum optical slope e?ciency greater than 50%. The experimental results lead to a 1 dB agreement with our simulation tool developed for single clad and double clad TDFAs. Overall this hybrid ampli?er o?ers versatile features with the potential of much higher output power.
关键词： Simulation,Fiber ampli?er,Multistage,Single frequency,Fiber measurement,Thulium
更新于2025-09-23 15:23:52
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Recent progress on narrow-linewidth crystalline bulk Raman lasers
摘要： Narrow-linewidth, solid-state Raman lasers are of signi?cant importance for numerous applications. In last decade, variety of methods have been utilized to suppress the spectral linewidth of Raman laser output. In this review we summarize the recent works of narrow-linewidth and/or single-frequency solid-state Raman lasers. The mechanisms and results are addressed while the positive and negative aspects of each technique are also discussed to give the readers a reference to choose a proper narrow-linewidth method for certain applications.
关键词： F-P etalon,Injection seeding,Narrow-linewidth laser,Single-frequency laser,Raman laser,Spatial hole burning
更新于2025-09-23 15:21:01
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Widely tunable ytterbium-doped single-frequency all-fiber laser
摘要： We demonstrate a widely tunable ytterbium-doped single frequency all-fiber laser with a computer-controlled tunable filter and a home-made comb spectrum filter. The comb filter is realized by fusing a single strand of polarization maintaining optical fiber into a double-circulator interferometer. The spectral performance of the comb filter is verified by theoretical and experimental studies. Wavelength-tunable single frequency operation in about 55 nm (1030–1085 nm) range can be achieved through the combined effect of these two filters. The experimental outcomes exhibit that an ultra-narrow linewidth of 435 Hz with high optical signal to noise ratio greater than 50 dB and high stability of operation wavelength and output power (0.016 nm and 0.38 dB, respectively) at room temperature. Our studies provide a new way to obtain the wide-range tunable single frequency fiber laser.
关键词： Wavelength-tunable,Fiber laser,Ultra-narrow linewidth,Single frequency,Comb spectrum filter
更新于2025-09-23 15:21:01
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - All-Fiber 2.07 μm Distributed Feedback Laser Based on π-Phase-Shifted FBG Inscribed in Heavily Doped Holmium Fiber by Femtosecond Laser Pulses
摘要： Distributed-feedback (DFB) fiber laser is a versatile source of low-noise single-frequency radiation that finds applications in spectroscopy, optical communications and sensing devices. Depending on the active medium, different lasing wavelengths can be obtained: 1.03–1.12 μm for Yb, 1.53–1.62 μm for Er, and 1.73–1.93 μm for Tm-doped fibers. Special fiber Bragg grating (FBG) with a length of 20–70 mm and phase shift in the structure, directly written in an active medium, serves as distributed feedback cavity of this type of laser. Commonly, special UV photosensitive fibers and phase masks inscription technique are used for an FBG fabrication. Alternative femtosecond (fs) point-by-point technique [1] has a number of advantages as compared to UV-based ones: 1) wide variety of active fibers can serve as a host material for an FBG, thanks to the nonlinear mechanism of fs pulses absorption, 2) FBG period can be easily tuned by controlling fs pulses frequency and velocity of fiber translation during the inscription process, 3) each fiber grating “pitch” can be written independently, which means that phase shift with an exact value and position along FBG can be introduced. Despite the number of publications dealing with holmium fiber lasers [2], there no publications devoted to DFB ones. At the same time, such type of laser sources has a great potential as a master oscillator in all-fiber coherent beam combination systems [3]. We report on the creation of holmium-doped DFB fiber laser with a wavelength of 2.07 μm operating in single-frequency regime (Fig. 1a). The laser is based on custom-made single-mode holmium-doped fiber having absorption coefficient about 43 dB/m at 1.125 μm, which is the wavelength of pump Yb fiber laser. 42-mm π-phase-shifted FBG was directly inscribed in the active fiber by femtosecond IR laser pulses and served as distributed feedback cavity of the laser. Lasing threshold was reached at 350 mW pump power, and output power exceeded 36 mW at pump power of 4.8 W (Fig. 1b). Single-polarization mode operation was observed with linewidth of ~10 kHz. Additionally to the room-temperature operation regime we will present and discuss the laser operation regimes at cryogenic temperature (77 K), as well as high-temperature (>400 K). To the best of our knowledge, it is the first realization of all-fiber DFB laser based on holmium active medium.
关键词： femtosecond laser pulses,holmium-doped fiber,single-frequency radiation,Distributed-feedback fiber laser,π-phase-shifted FBG
更新于2025-09-23 15:19:57
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[IEEE 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Sao Paulo, Brazil (2019.10.7-2019.10.9)] 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Dynamically stable continuous single frequency green ring laser
摘要： A single-frequency ring laser using two standard commercial diode-pumped Nd:YAG modules is demonstrated. Employing a dynamically stable resonator design, multi-longitudinal mode operation at 1064 nm with 53 W of output power was obtained. When inserting a LBO crystal in the resonator, 1.8 W of single-sided, single-frequency output at 532 nm was achieved. The measured linewidth was 3.6 MHz, close to the resolution limit of the scanning etalon used to measure the longitudinal mode structure.
关键词： dynamic stable resonators,Single frequency lasers,ring lasers,second harmonic generation
更新于2025-09-16 10:30:52
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High-coupling distributed feedback lasers for the 1.55 μm spectral region
摘要： A technique for the development of high-coupling distributed-feedback (DFB) lasers for the 1.55 mm spectral region is described. The lasers demonstrate stable single-frequency generation in a broad temperature range with a maximum side-mode suppression ratio of more than 30 dB.
关键词： single-frequency lasing,distributed feedback,semiconductor laser,side-mode suppression ratio
更新于2025-09-16 10:30:52