A high efficiency architecture for cascaded Raman fiber lasers

Supradeepa, V. R.; Nichsolson, Jeffrey W.; Headley, C.; Yan, M. F.; Pálsdóttir, B.; Jakobsen, Dan

doi:10.1364/oe.21.007148

Cited by 50 publications

(29 citation statements)

References 21 publications

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“…Significant power transfer to the Stokes field can take place and conversion efficiencies of 70% are not uncommon in fiber Raman lasers, based on a simple pump geometry of a fiber laser pumping a Raman gain fiber in a basic fiber laser cavity formed by two integrated fiber Bragg reflectors at the desired Raman wavelength. 33 In principle, the anti-Stokes wavelength can be generated through the absorption of energy from an oscillating excited molecule, but the signal is significantly weaker. This is because the molecule must be in the excited state and this is energetically less likely than being in the ground state.…”

Section: Raman Scattering In Silica Fibersmentioning

confidence: 99%

“…This is most simply achieved through the use of a cascaded resonator based upon a highly nonlinear, usually germanium-doped fiber, comprising a series of nested cavities consisting of embedded fiber Bragg gratings at the desired wavelengths, as first described by Grubb et al 99 Through system refinement and development, fiber Raman lasers are currently capable of operating at many hundreds of watts CW and with conversion efficiencies approaching the limit set by the quantum conversion. 33 Consequently, any wavelength in the window of transparency of the fiber can be generated through the cascaded Raman process, provided a suitable pump laser is available and this is generally achieved using a rare earth doped laser, a Raman fiber laser or their frequency doubled analogue, making a simple fiber loop a universal wavelength source. Consequently, if a universal saturable absorber can be inserted, such a simple configuration could constitute a universal pulse source, with a wavelength of operation determined solely by the pump wavelength.…”

Section: Graphene Mode-locked Fiber Lasersmentioning

confidence: 99%

“…2.5 and it described how efficient cascaded Stokes generation could be achieved and how simple Raman fiber lasers could be constructed using nested cavities in small core fiber cavities formed by sets of fiber Bragg gratings, with resonant wavelengths corresponding to the peak wavelength shifts of various cascaded Raman orders. 33 In this way, the complete near infrared from an initial pump wavelength around 1030 nm supplied by a Yb fiber laser to beyond 2300 nm limited by silica fiber loss can be achieved. In addition to CW operation, pulsed outputs can be realized using synchronous pumping either from mode locked lasers or from high-power MOPFA schemes.…”

Section: Visible Generation Through Second Harmonic Generation Of Fibmentioning

confidence: 99%

See 2 more Smart Citations

Tutorial on fiber-based sources for biophotonic applications

Taylor

2016

J. Biomed. Opt

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Abstract. Fiber-based lasers and master oscillator power fiber amplifier configurations are described. These allow spectral versatility coupled with pulse width and pulse repetition rate selection in compact and efficient packages. This is enhanced through the use of nonlinear optical conversion in fibers and fiber-coupled nonlinear crystals, which can be integrated to provide all-fiber pump sources for diverse application. The advantages and disadvantages of sources based upon supercontinuum generation, stimulated Raman conversion, four-wave mixing, parametric generation and difference frequency generation, allowing spectral coverage from the UV to the mid-infrared, are considered.

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Section: Raman Scattering In Silica Fibersmentioning

confidence: 99%

Section: Graphene Mode-locked Fiber Lasersmentioning

confidence: 99%

Section: Visible Generation Through Second Harmonic Generation Of Fibmentioning

confidence: 99%

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Tutorial on fiber-based sources for biophotonic applications

Taylor

2016

J. Biomed. Opt

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“…Email: zhoupu203@163.com (P. Zhou), zhanghanwei100@163.com (H. Zhang) laser. Raman fiber laser has unique properties such as the broad gain spectrum and the wavelength versatility, which have been demonstrated in a large variety of wavelength bands [11][12][13][14][15][16][17][18][19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Toward high-power nonlinear fiber amplifier

Zhang

et al. 2018

High Pow Laser Sci Eng

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Stimulated Raman scattering (SRS) effect is considered to be one of the main obstacles for power scaling in general-type fiber lasers. Different from previous techniques that aim at suppressing SRS, nonlinear fiber amplifier (NFA), which manipulates and employs the SRS for power scaling in rare-earth-doped fiber, is under intensive research in recent years. In this paper, the authors will present an all-round study on this new kind of high-power fiber amplifier. A theoretical model is proposed based on the rate equation and amplified spontaneous emission (ASE), with random noise taken into account. By numerical solving of the theoretical model, the power scaling potential, heat analysis and advantages in suppressing the undesired backscattering light are quantificationally analyzed for the first time. Then two different types of high-power NFAs are demonstrated individually. Firstly, a laser diode pumped NFA has reached kilowatt output power, and the results agree well with theoretical predictions. Secondly, a tandem-pumped NFA is proposed for the first time and validated experimentally, in which 1.5 kW output power has been achieved. The authors also briefly discuss several new issues relating to the complex nonlinear dynamics that occur in high-power NFAs, which might be interesting topics for future endeavors.

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“…Termination of cascaded Raman conversion has been implemented previously at a fixed wavelength band of 1.5μm with the help of specialty Raman filter fiber [12]. Such specialty fiber has been utilized both in conventional cascaded Raman lasers [3][4][5], and in cascaded Raman lasers based on RDFB [13]. Also, natural termination due to enhanced intrinsic absorption losses of optical fiber [14] and the use of fiber-based Lyot filters in polarization maintaining systems [15] were demonstrated previously.…”

mentioning

confidence: 99%

High-power, cascaded random Raman fiber laser with near complete conversion over wide wavelength and power tuning

2019

Self Cite

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Cascaded Raman fiber lasers based on random distributed feedback (RDFB) are proven to be wavelength agile, enabling high powers outside rare-earth doped emission windows. In these systems, by simply adjusting the input pump power and wavelength, highpower lasers can be achieved at any wavelength within the transmission window of optical fibers. However, there are two primary limitations associated with these systems, which in turn limits further power scaling and applicability. Firstly, the degree of wavelength conversion or spectral purity (percentage of output power in the desired wavelength band) that can be achieved is limited. This is attributed to intensity noise transfer of input pump source to Raman Stokes orders, which causes incomplete power transfer reducing the spectral purity. Secondly, the output power range over which the high degree of wavelength conversion is maintained is limited. This is due to unwanted Raman conversion to the next Stokes order with increasing power. Here, we demonstrate a high-power, cascaded Raman fiber laser with near complete wavelength conversion over a wide wavelength and power range. We achieve this by culmination of two recent developments in this field. We utilize our recently proposed filtered feedback mechanism to terminate Raman conversion at arbitrary wavelengths, and we use the recently demonstrated technique (by J Dong and associates) of low-intensity noise pump sources (Fiber ASE sources) to achieve high-purity Raman conversion. Pump-limited output powers >34W and wavelength conversions >97% (highest till date) were achieved over a broad -1.1μm to 1.5μm tuning range. In addition, high spectral purity (>90%) was maintained over a broad output power range (>15%), indicating the robustness of this laser against input power variations.

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A high efficiency architecture for cascaded Raman fiber lasers

Cited by 50 publications

References 21 publications

Tutorial on fiber-based sources for biophotonic applications

Tutorial on fiber-based sources for biophotonic applications

Toward high-power nonlinear fiber amplifier

High-power, cascaded random Raman fiber laser with near complete conversion over wide wavelength and power tuning

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