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220 W Raman fiber laser at 1.24 μm based on phosphosilicate fiber
摘要： A Raman fiber laser with more than 220 W output at 1.24 μm with phosphorus-doped single-mode fiber as gain medium is reported. The laser consists of a 30 m long piece of fiber and a pair of fiber Bragg gratings with different bandwidth, pumped with a high power 1064 nm Yb fiber laser. The optical conversion efficiency is 64% and the slope efficiency is 71.4%. The full width half-maximum linewidth at the maximum output is 5.6 nm. To the best of our knowledge, the reported power is an order magnitude higher than previous reports in phosphosilicate fiber Raman laser.
关键词： Raman laser,phosphosilicate fiber,Fiber laser
更新于2025-11-28 14:24:03
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Towards Applications of Stimulated Raman Scattering in Nanophotonics
摘要： Nanophotonics is a rapidly evolving field, exploring behaviour of light on the micro/nano scale and the interaction of micro/nano objects with light. The driving force for its development is the promise to go far beyond the conventional boundaries of photonics. Because of the diffraction limit, high-density regular optical components do not have the ability to confine light down to the microscale dimension. The footprint of devices becomes more critical for applications with limited physical space, such as on-chip silicon-based photonic devices. In this paper, a review of some of the most significant accomplishments in the field of stimulated Raman scattering in microstructures is reported. These findings indicate promising perspectives for integrated Raman lasers.
关键词： Raman laser,stimulated Raman scattering,nanophotonics,nonlinear optics
更新于2025-09-23 15:22:29
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Diode pumped Nd:YVO <sub/>4</sub> /LBO/Ba(NO <sub/>3</sub> ) <sub/>2</sub> Raman laser at 563 nm
摘要： Radiation at a wavelength of 563 nm was achieved using an all-solid-state laser system based on a diode-pumped actively Q-switched Nd3+:YVO4 laser with intra-cavity second harmonic generation in LBO followed by intra-cavity Raman conversion in Ba(NO3)2. The output power of 101 mW was achieved under a pump power of 5 W and a modulation frequency of 12.7 kHz with a slope conversion efficiency of 19%. The achieved peak power at 563 nm was 0.67 kW, which allows one to use this laser in medical treatment through selective excitation of deoxyhemoglobin into its long-wavelength absorption peak.
关键词： stimulated Raman scattering,intracavity second harmonic generation,563 nm,Raman laser
更新于2025-09-23 15:21:01
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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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976a??nm all-fiber Raman laser with high beam quality at multimode laser diode pumping
摘要： A 976 nm all-fiber Raman laser enabling high beam quality at direct multimode laser diode pumping with low beam quality (M2 > 30) is demonstrated. The laser is performed in a 100/140 multimode graded-index fiber with special in-fiber Bragg gratings that secure generation of the Stokes beam with relatively good quality (M2 ? 2) and high slope efficiency of the pump-to-Stokes conversion (70%) at output powers of up to ~50 W.
关键词： graded-index fiber,fiber laser,diode pumping,Raman laser
更新于2025-09-23 15:19:57
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1 kHz dual sub-pulse train picosecond radially polarized beam KGW Raman generator capable of achieving multiple optical communication wavelength
摘要： A dual sub-pulse train 1064 nm picosecond radially polarized beam pump KGW single-pass Raman generator was designed. The Stokes lines of both the 768 cm?1 and 901 cm?1 vibrational modes of the KGW Raman-active crystal were excited simultaneously. The Raman generator radiated up to seven Stokes lines in the infrared spectrum, which covered multiple optical communication channels. The overall Stokes average power reached 1.01 W, and the maximum Raman overall conversion efficiency was 23.1%. The interaction between the optical field and the Raman crystal was discussed from two perspectives of line width compression and beam quality.
关键词： Multi-wavelength KGW Raman laser,Nonlinear optics,Dual sub-pulse train picosecond laser,Infrared spectrum,Radially polarized beam
更新于2025-09-12 10:27:22
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An integrable all-silicon slotted photonic crystal Raman laser
摘要： The design of an integrable all-silicon Raman laser of a foot print of (cid:1)7 μm is proposed based on a slotted photonic crystal nanocavity. The slot has been considered to be made of a silicon nanocrystal to encash its giant Raman gain coe?cient, along with the tight spatial and temporal con?nement of light in the slot, exhibiting a lasing e?ciency of (cid:1)17:8% at a wavelength of 1552 nm. Simulations depict that the device requires a very small optical threshold power of the order of 0.5 μW. Tolerances to the fabrication imperfections have also been evaluated, which explores that the device performance is tolerant up to a 6% random deviation in structural parameters like radius and in-plane positions of the holes. It has also been seen through simulations that the submicrowatt threshold is maintained even for a large deterioration of over 30% in the Q-factors and modal volumes, which reassures the realization feasibility of the device.
关键词： fabrication tolerance,photonic crystal nanocavity,silicon nanocrystal,lasing efficiency,all-silicon Raman laser
更新于2025-09-12 10:27:22
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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 Passive KGW/Tm:YAP Raman Laser
摘要： High brightness sources in the 2-3 micron region are essential for many applications including wavelength selective microsurgery, material processing, and gas monitoring. Although there are some rare-earth ions which enable such laser sources like Tm, Ho and Cr, those suitable lasers do not tailor all this spectral range. Solid-state Raman lasers are one of the efficient methods enabling to extend the spectral span of high brightness sources. Over the last five years, this trend was also realized in the 2 micron region, using BaWO4 and YVO4 crystals as Raman gain medium. Having minor thermal lensing and high damage threshold KGd(WO4)2 (KGW) is another promising Raman crystal, implemented until now with 1064 nm and 532 nm. This crystal has two different Raman shifts (901 cm-1 and 768 cm-1), enabling to yield, by control of the polarization orientation, two different stokes wavelengths. Here we present, for the first time, an external-cavity configuration for an all Passive Raman laser, based on passive fundamental pump with a KGW crystal. The KGW being pumped by an end pump CrZnS passively Q-switched Tm:YAP laser emitting at 1935 nm. This laser seed modified from our previous work, in order to achieve the higher peak power for the non-linear effect to take place. The seed had a maximal energy pulse of 1.5 mJ, having a pulse duration of 17 ns at a repetition rate of 1.3 kHz resulting in a peak-power of 90 kW for an average power of 2.1 W. This Raman laser emitted at 2270 nm and 2350 nm having 150 and 104 mW average power, respectively. Pulse duration as short as 12.5 ns and a maximal peak-power of 14.35 kW obtained.
关键词： KGW,Tm:YAP,2-3 micron region,Raman laser,passive Q-switching
更新于2025-09-12 10:27:22
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Raman laser from an optical resonator with a grafted single-molecule monolayer
摘要： Raman-based technologies have enabled many ground-breaking scientific discoveries related to surface science, single-molecule chemistry and biology. For example, researchers have identified surface-bound molecules by their Raman vibrational modes and demonstrated polarization-dependent Raman gain. However, a surface-constrained Raman laser has yet to be demonstrated because of the challenges associated with achieving a sufficiently high photon population located at a surface to transition from spontaneous to stimulated Raman scattering. Here, advances in surface chemistry and in integrated photonics are combined to demonstrate lasing based on surface stimulated Raman scattering (SSRS). By creating an oriented, constrained Si–O–Si monolayer on the surface of integrated silica optical microresonators, the requisite conditions for SSRS are achieved with low threshold powers (200?μW). The expected polarization dependence of SSRS due to the orientation of the Si–O–Si bond is observed. Owing to the ordered monolayer, the Raman lasing efficiency is improved from ~5% to over 40%.
关键词： surface stimulated Raman scattering,single-molecule monolayer,Raman laser,optical resonator,polarization dependence
更新于2025-09-11 14:15:04
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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 High-Average-Power 4.42-μm Raman Laser Based on Silica Fiber
摘要： Mid-infrared lasers operating at wavelengths above ~3 μm are required for many applications. The lasers of a particular interest are those that can provide high average power and high quality of the output beam. A promising approach to realize such lasers is the use of gas-filled hollow-core fibers (HCF), which combine mid-infrared light guidance with all the advantages of well-established silica fiber technology. Recent progress in silica HCFs for mid-infrared spectral range has resulted in demonstration of various gas fiber lasers at wavelengths from 2.8 to 4.6 μm [1-5]. However, those lasers use bulk elements to couple the pump into a HCF, thus losing such advantages as compactness and alignment-free operation, which are expected from fiber lasers. In this work we demonstrate an all-fiber gas Raman laser operating in a single transversal mode at 4.42 μm and generating average output power as high as 360 mW. The Raman laser was constructed using silica-based fibers only (Fig.1a). A pump source was a high-power erbium-doped fiber laser emitting 2-ns pulses with 75-kHz repetition rate at 1.56 μm. The output fiber of the pump laser was fusion spliced to a revolver-type HCF. In spite of a large difference in mode field diameters of the solid-core and hollow-core fibers (20 and 55 μm, respectively), a 3-dB splice losses were obtained. The splice point was mechanically stable and no splice loss degradation was observed when HCF was filled by molecular hydrogen up to pressure of 50 atm. By using a 3.2-m-long hydrogen-filled revolver-type HCF we realized an efficient 1.56 to 4.42 μm Raman conversion in a single-pass single-cascade scheme. When 2.3 W of the pump average power was coupled to the HCF, the Raman laser generated as high as 360 mW of average power at 4.42 μm (Fig.1b). The quantum conversion efficiency was as high as 46 %. A beam quality factor of the output radiation at λ=4.42 μm was evaluated to be M2=1.4. Our results demonstrate that gas fiber Raman lasers based on revolver hollow-core silica fibers are a viable solution for the development of all-fiber mid-infrared lasers that combine a compact alignment-free design with high power single mode operation. An application area of such laser sources includes, but is not limited to, a high-average-power mid-infrared supercontinuum generation, which is of high importance for numerous applications in science, biomedicine and technology.
关键词： gas-filled hollow-core fibers,silica fiber,mid-infrared lasers,Raman laser,high power
更新于2025-09-11 14:15:04