High-Power and High-Order Random Raman Fiber Lasers

Zhang, Lei; Dong, Jinyan; Feng, Yang

doi:10.1109/jstqe.2017.2759261

Cited by 58 publications

(24 citation statements)

References 27 publications

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“…Among all the potential applications, RFL with short fiber length is preferable for achieving highly efficiency/power output, while the optical-to-optical efficiency could approach the quantum limit [4,5]. Numerous researches on high-power RFLs have been put forward in recent years [6][7][8][9]. The output power of RFL based on short fiber length has been continuously promoted with the optimization of laser structures.…”

Section: Introductionmentioning

confidence: 99%

High-power low spatial coherence random fiber laser

Ma¹,

Li²,

Guo³

et al. 2019

Opt. Express

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A high-power multi-transverse modes random fiber laser (RFL) is investigated by combining a master oscillator power-amplifier (MOPA) configuration with a segment of extra-large mode area step-index multimode fiber (MMF). Spatial coherence of the highpower multi-transverse modes RFL has been analyzed, which shows that speckle contrast is reduced dramatically with the output power increasing. In this way, considerably low speckle contrast of ~0.01 is achieved under high laser power of ~56 W, which are the records for multi-transverse modes RFLs in both spatial coherence and output power. This work paves a way to develop high-power RFLs with very low spatial coherence for wide-range speckle-free imaging and free-space communication applications.

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Section: Introductionmentioning

confidence: 99%

High-power low spatial coherence random fiber laser

Ma¹,

Li²,

Guo³

et al. 2019

Opt. Express

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“…A possible way is to use Raman fiber with high Raman gain coefficient and low‐noise high‐power RFL pumped by LD through cascaded SRS effect to improve the output performance of the system in future work. [ 30,34 ]…”

Section: Resultsmentioning

confidence: 99%

“…In addition, RFLs have characteristics of good temporal stability, wide wavelength tunability and obtainable cascade Stokes effect, which are beneficial to achieve mode locking covering wide wavelength range with high stability. [30][31][32][33] Therefore, RFLs have great potential as ideal pump sources for mode locking of Raman fiber lasers.…”

Section: Introductionmentioning

confidence: 99%

Raman Gain Square‐Wave Noise‐Like Pulse Laser Pumped by a Random Fiber Laser

2021

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Mode locking of a long‐cavity Raman fiber laser pumped by a low‐noise random fiber laser (RFL) is demonstrated experimentally, where tunable square‐wave noise‐like pulse (NLP) is generated through nonlinear polarization rotation technology. Pulse duration can be tuned from 26 to 134 ns by controlling the polarization state or pump power at a repetition rate of 93 kHz. A signal‐to‐noise ratio of 64 dB is obtained due to the low‐noise characteristic of RFL. In addition, up to 24th high‐order harmonic mode‐locked square‐wave NLP is observed, which has not been reported in mode‐locked Raman fiber lasers with large normal dispersion. This approach not only provides a good temporal stable pump source for mode locking of Raman fiber lasers, but also enriches the methods of laser pulse generation and regulation.

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“…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. However, all the previous methods work only at fixed wavelength bands and don't work for a wavelength tunable configuration.…”

mentioning

confidence: 99%

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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High-Power and High-Order Random Raman Fiber Lasers

Cited by 58 publications

References 27 publications

High-power low spatial coherence random fiber laser

High-power low spatial coherence random fiber laser

Raman Gain Square‐Wave Noise‐Like Pulse Laser Pumped by a Random Fiber Laser

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

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