High-power, widely wavelength tunable, grating-free Raman fiber laser based on filtered feedback

Balaswamy, V.; Aparanji, Santosh; Arun, S.; Ramachandran, Siddharth; Supradeepa, V. R.

doi:10.1364/ol.44.000279

Cited by 39 publications

(13 citation statements)

References 18 publications

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“…The current system has discrete tuning due to a fixed wavelength input ASE source. However, this system can be easily configured to obtain continuous wavelength tuning as in [16] by using a tunable wavelength ASE pump source. In order to study the importance of filtered feedback mechanism, we have plotted in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…However, all the previous methods work only at fixed wavelength bands and don't work for a wavelength tunable configuration. Recently, we demonstrated a novel filtered feedback mechanism to terminate cascaded Raman conversion at any arbitrary wavelength band enabling a high-power, ultra-widely tunable, cascaded Raman fiber laser [16]. In this work, we combine both these significant developments -utilizing temporally stable pump source for cascaded Raman conversion, and filtered feedback mechanism to terminate Raman cascade at any arbitrary wavelengths.…”

mentioning

confidence: 99%

“…Figure 1 shows the experimental setup. The high-power cascaded Raman conversion module is similar to the one we recently demonstrated [16]. Here, input pump source is an in-house built high-power Yb doped fiber ASE source operating at 1064nm The pump source consists of 4 stages where, a broadband ASE seed is filtered before amplifying to ~88W in three stages.…”

mentioning

confidence: 99%

“…This necessitates the use of filter fiber based filters which provide a much sharper and higher OD filters than thin-film based filters. This has been discussed in detail in [16]. A broad-band (800nm -20μm), high reflecting (>96%) gold coated mirror was used to feed-back filtered backward propagating Raman Stokes signals into the cascaded Raman conversion stage.…”

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confidence: 99%

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

2019

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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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Section: Methodsmentioning

confidence: 99%

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

2019

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“…[30][31][32][33][34][35] Owing to the low threshold of high-order SRS, it can generate cascaded Raman-Stokes wave for wavelength extension. [36][37][38] Furthermore, the interplay of Raman effect and modulation instability (MI) induced by high order nonlinear effects such as self-phase modulation (SPM) and cross-phase modulation (XPM) can generate SC. [6,[39][40][41] Meanwhile, RRFLs have been demonstrated to be an effective seeder source for power scaling over kilowatt level.…”

Section: Introductionmentioning

confidence: 99%

High-power all-fiber supercontinuum generation in normal dispersion region

Wang

et al. 2023

Advanced Fiber Laser Conference (AFL2022)

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Supercontinuum (SC) sources have extensive applications in tomography, spectroscopy, and communications. Numerous applications, including ultrahigh-resolution optical coherence tomography, free-space broad-spectrum optical communication, high-speed imaging, spectroelectrochemical ellipsometry, and spectral sensitivity evaluation are based on SC. SC generation in optical fibers could be easily observed in the anomalous dispersion region near 1.5 μm. Indeed, in the normal dispersion region, the modulation instability induced by cross phase modulation could also generate the SC. In this study, an all-fiber-integrated high-power tandem-pumped random Raman laser amplifier is built for SC generation in normal dispersion region. The output power exceeds 1 kW. And the spectrum covers the range from 1.07 μm to 1.6 μm.

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Spectral Manipulations of Random Fiber Lasers: Principles, Characteristics, and Applications

Han,

Cheng,

Tao

et al. 2024

Laser & Photonics Reviews

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Random fiber lasers (RFLs), a new variety of random lasers, have become a vigorous research spot over the past decades. RFLs possess superiorities in efficiency, structural flexibility, directionality, cost, etc. Particularly, RFLs are discovered to be good platforms for the construction of various forms of high‐performance lasers. Herein, recent progress in the spectral manipulation of RFLs and the applications of spectral‐tailored RFLs are reviewed. Both theoretical and experimental investigations of the unique spectral properties of RFLs up to now are presented. The superior wavelength flexibility of RFLs which can achieve any desired lasing wavelength in the 1–2.1 µm band is highlighted. Via spectral manipulation, RFLs have shown the capability of high‐spectral‐purity, narrow‐bandwidth, and multi‐wavelength output. Furthermore, the RFLs featuring unique spectral properties can lead to various promising applications, which are concisely summarized, including optical fiber communication, optical fiber sensing, imaging, supercontinuum generation, nonlinear‐frequency conversion, mid‐infrared lasing pump sources, and laser‐driven inertial confinement fusion motivation. The challenges and prospects for RFLs are also discussed.

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High-power, widely wavelength tunable, grating-free Raman fiber laser based on filtered feedback

Cited by 39 publications

References 18 publications

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

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

High-power all-fiber supercontinuum generation in normal dispersion region

Spectral Manipulations of Random Fiber Lasers: Principles, Characteristics, and Applications

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