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oe1(光电查) - 科学论文

8 条数据
?? 中文（中国） ▾

  • 990 nm High-power High-beam-quality DFB Laser With Narrow Linewidth Controlled By Gain-coupled Effect

    摘要： High-power single-longitudinal-mode regrowth-free gain-coupled distributed feedback laser diode based on ridge waveguide with periodic current injection is achieved at 990 nm. Our device is fabricated only by standard i-line lithography with micron-scale precision, obtains an excellent performance at high injection current. A continuous-wave power of over 0.681 W is achieved at 3 A. The maximum continuous-wave power at single-longitudinal-mode operation is up to 0.303 W at 1.4 A. Narrow linewidth emission has been reached with a 3 dB spectrum width less than 1.41 pm. The high side mode suppression ratio is over 35 dB. The lateral far field divergence angle is only 15.05 °, the beam quality factor M 2 is 1.245, achieving a laterally near-diffraction-limit emission. It is more beneficial for single mode fiber coupling as pumping sources and other applications which require high beam quality at high power with easy fabrication technique.

    关键词： narrow linewidth,Single-longitudinal mode,Gain-coupled DFB,Semiconductor lasers

    更新于2025-11-28 14:24:03

  • Direct oscillation at 640-nm in single longitudinal mode with a diode-pumped Pr:YLF solid-state laser

    摘要： A diode-pumped solid-state laser directly emitting continuous-wave (cw), single-longitudinal mode (SLM) output at 640-nm with a c-cut praseodymium-doped yttrium lithium fluoride (Pr:YLF) crystal was demonstrated for the first time, to the best of our knowledge. Combining two quarter-wave plates (QWPs) and one Brewster plate to form a twisted-mode cavity, this SLM solid-state laser achieved a maximum cw output power of 403 mW with a threshold of 600 mW and a slope efficiency of 26.8%. The emission spectrum had a linewidth of 150 MHz. The single-mode beam quality (M2) was 1.10 and 1.07 along the x and y direction, respectively.

    关键词： Single-longitudinal-mode,Diode-pumped solid-state lasers,Visible lasers

    更新于2025-11-28 14:23:57

  • Doubly Q-switched single longitudinal mode Nd:YAG laser with electro-optical modulator and Cr4???:YAG

    摘要： An electro-optical modulator (EOM) and Cr4+:YAG saturable-absorber-based doubly Q-switched Nd:YAG laser at 1.06 μm with single-longitudinal-mode (SLM) output was demonstrated. The spatial-hole-burning suppression and cavity axial-mode selection were provided by a twisted-mode technique and resonant-reflector-mediated SLM operation. The Cr4+:YAG initial transmittance (??0) affected the pulse profile, pulse energy, and laser spectra, which were analyzed theoretically and experimentally. Consequently, the laser output obtained an SLM rate of 96.2% with a symmetry factor of 0.64 when ??0 was 6.2%. The results indicate that symmetric and SLM laser pulse can be obtained in a double Q-switched laser by adjusting the cavity loss according to ??0. Compared with a solely Q-switched laser, the double Q-switches of EOM and Cr4+:YAG provide a practical route toward the generation of a symmetric temporal profile and SLM operation.

    关键词： Twisted-mode cavity,Symmetric pulses,Doubly Q-switched,Resonant reflector,Single-longitudinal-mode

    更新于2025-09-23 15:19:57

  • [IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - A widely tunable single longitudinal mode erbium-doped fiber laser based on a microfiber knot resonator

    摘要： A widely tunable single longitudinal mode erbium-doped fiber laser based on a microfiber knot resonator is proposed. The laser is tuned from 1545 ~ 1565 nm with a high side-mode suppression ratio of 55 dB.

    关键词： Fiber laser,Microfiber knot resonator,Single longitudinal mode

    更新于2025-09-16 10:30:52

  • Widely 70-nm wavelength tunability single-frequency erbium laser utilizing multiple-ring architecture

    摘要： In this paper, to accomplish the broadly wavelength tunability and single-longitudinal-mode (SLM) operation of erbium-doped fiber (EDF) based laser, the multiple-ring structure is designed and executed. The output power of ?7.3 to 5.1 dBm and optical signal to noise ratio (OSNR) of 31.5 to 36.7 dB/0.06 nm are obtained for the proposed EDF laser over the tuning range of 1520.0–1590.0 nm based on the C-band EDF gain medium. In addition, the Lorentzian linewidth of 14.9 to 20.4 kHz is also attained.

    关键词： Wavelength-tunability,Erbium-doped fiber,Single-longitudinal-mode (SLM),Fiber laser,Multiple-ring

    更新于2025-09-16 10:30:52

  • Stable Single-Longitudinal-Mode Fiber Laser With Ultra-Narrow Linewidth Based on Convex-Shaped Fiber Ring and Sagnac Loop

    摘要： In this investigation, a convex-shaped ?ber ring (CSFR)-based single-longitudinal-mode (SLM) erbium-doped ?ber laser (EDFL) is proposed and experimentally veri?ed. The CSFR, composed of only two optical couplers and forming a double-ring architecture, is employed to serve as a high quality mode ?lter to eliminate the dense longitudinal modes of the EDFL. The unpumped erbium-doped ?ber in the Sagnac loop is utilized to produce the ultra-narrowband auto-tracking ?lter effect as a saturable absorber to guarantee the SLM out. The experimental results show that the linewidth of the proposed EDFL is 840 Hz with a high optical signal to noise ratio of 63 dB. In addition, the stability of the EDFL with the maximum output power ?uctuation of 0.01 dB and the maximum central wavelength variation of 0.01 nm, in both the short-term and the long-term observations. Hence, we obtained a SLM EDFL with extremely high stability, ultra-narrow linewidth and high optical signal to noise ratio (OSNR).

    关键词： saturable absorber,Single longitudinal mode (SLM),erbium-doped ?ber laser (EDFL)

    更新于2025-09-16 10:30:52

  • [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) - Low-Jitter, Narrow-Bandwidth, Single Longitudinal Mode Passively Q-Switched Nd:YAG Ring Laser Oscillator with External Feedback

    摘要： Fourier-limited, also called single-frequency or single-longitudinal-mode (SLM) nanoseconds lasers at 1 μm are key elements for several applications, such as optical communications, data storage and high-resolution spectroscopy. Some special application such as high spectral resolution LIDAR [1], require very high spectral purity (tens of MHz bandwidth), resulting in long pulse durations in the range of several tens of ns. Microchip lasers with large free spectral range (FSR) comparable to the active medium gain bandwidth (about 160 GHz for Nd:YAG) allow easy SLM selection, but with much shorter pulses. Recently, we demonstrated a Cr:YAG Passively Q-Switched (PQS) Nd:YVO4 ring laser oscillator delivering 50-ns, 80-μJ SLM pulses at 0.1-10 kHz repetition rate employing a specifically designed intracavity etalon to enhance SLM operation [2]. For SLM PQS operations, Nd:YAG offers some advantages if compared to Nd:YVO4. Namely, the higher saturation fluence relaxes the fulfilment of the second PQS threshold condition, the ~2 times longer fluorescence lifetime enhances energy storage and the narrower gain bandwidth favours SLM operation.

    关键词： Nd:YAG,single-longitudinal-mode,passively Q-switched,external feedback,ring laser

    更新于2025-09-12 10:27:22

  • Tunable single-longitudinal-mode fiber laser based on a chirped fiber Bragg grating

    摘要： In this paper, a tunable single-longitudinal-mode (SLM) fiber laser based on a chirped fiber Bragg grating (CFBG) is proposed and experimentally demonstrated. Multi-sub-cavities formed by a single CFBG inserted inside the laser loop greatly increase the longitudinal mode spacing so that SLM operation can be obtained. The SLM laser output can be tuned in a wide wavelength range from 1535 to 1565 nm by simply adjusting the central wavelength of a tunable optical band-pass filter (TOBF). A side-mode suppression ratio of larger than 50 dB and a linewidth of less than 8.5 kHz have been respectively achieved.

    关键词： Single-longitudinal-mode (SLM),Fiber laser,Chirped fiber Bragg grating (CFBG)

    更新于2025-09-11 14:15:04