Kilowatt-level fiber amplifier with spectral-broadening-free property, seeded by a random fiber laser

Du, Xueyuan; Zhang, Hanwei; Ma, Pengfei; Hu, Xiao; Wang, Xiaolin; Zhang, Pu; Liu, Zejin

doi:10.1364/ol.40.005311

Cited by 62 publications

(26 citation statements)

References 40 publications

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“…3(a) and 3(b) respectively. The bandwidth of the amplified random-lasing broadens slightly with the increasing of pump power, which is a notable characteristic comparing to conventional laser amplification process [11]. This can maintain the high spectral density feature of the RFL light source which is an advantage for speckle-free imaging with disordered medium [18].…”

Section: Resultsmentioning

confidence: 99%

“…More than 400 W RFL with good beam quality has been realized in a half-opened fiber structure, which is the record power of the state of art [10]. Moreover, the spectral bandwidth of the RFL has been demonstrated to be well maintained during high-power amplification in a master oscillator power-amplifier (MOPA) configuration that generates kilowatt-level RFL output [11].…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-power low spatial coherence random fiber laser

Ma¹,

Li²,

Guo³

et al. 2019

Opt. Express

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“…According to the huge application potentials, approaches of controlling the spectral, temporal, polarization state or mode features of RDFFL have become an attractive issue. For instance, the temporally stable RDFFL used as the seed source in high‐power amplification shows well‐maintained linewidth during kilowatt power lasing . Further investigation on the narrow spectral linewidth control of the RDFFL seed source has its significance in achieving high‐power narrow linewidth fiber laser output.…”

Section: Discussion and Outlookmentioning

confidence: 99%

“…Recently, a temporally stable 1070‐nm RDFFL was achieved in a half‐opened cavity structure . The RDFFL was then boosted to the kilowatt level output with one‐stage power amplification based on a Yb‐doped fiber MOPA configuration . As shown in Fig.…”

Section: Current Applications Of High‐power Rdfflmentioning

confidence: 99%

“…Due to the close connection between the nonlinear effect and the laser's temporal instability or coherence, it is believed that the spectral broadening can be controlled by eliminating the temporal fluctuations. The application of using RDFFL as a highly temporally stable seed source in the MOPA system has been experimentally realized with a “spectral‐broadening‐free” property . The absence of spectral broadening by utilizing RDFFL as the seed source in high‐power MOPA system shows significance for spectral beam combination and other applications that require narrow‐linewidth high‐power lasing.…”

Section: Current Applications Of High‐power Rdfflmentioning

confidence: 99%

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High‐power random distributed feedback fiber laser: From science to application

Zhang

et al. 2016

Annalen der Physik

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A fiber laser based on random distributed feedback has attracted increasing attention in recent years, as it has become an important photonic device and has found wide applications in fiber communications or sensing. In this article, recent advances in high-power random distributed feedback fiber laser are reviewed, including the theoretical analyses, experimental approaches, discussion on the practical applications and outlook. It is found that a random distributed feedback fiber laser can not only act as an information photonics device, but also has the feasibility for high-efficiency/high-power generation, which makes it competitive with conventional high-power laser sources. In addition, high-power random distributed feedback fiber laser has been successfully applied for midinfrared lasing, frequency doubling to the visible and high-quality imaging. It is believed that the high-power random distributed feedback fiber laser could become a promising light source with simple and economic configurations.

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High‐Power Multimode Random Fiber Laser for Speckle‐Free Imaging

et al. 2021

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New light sources with low spatial coherence and high brightness are crucial for high‐quality imaging. In this paper, such a light source is reported, which is formed by combining random lasing used as seed light with a multimode fiber (MMF) mediated master oscillator power amplifier (MOPA) for power scaling and spatial decoherence. Experimental results show that the proposed multimode random fiber laser (MM‐RFL), with low noise, high spectral density, and high power efficiency, can achieve a maximum output power of 100.6 W and speckle contrast of as low as 0.037. Furthermore, MM‐RFL‐based speckle‐free imaging is demonstrated. The imaging quality can be improved by increasing the output power of the MM‐RFL as its spatial coherence decreases with an increasing number of effective modes excited in the MMF. Such a MM‐RFL provides a powerful light source for speckle‐free imaging applications where high power and low spatial coherence are essential for high‐quality imaging.

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Kilowatt-level fiber amplifier with spectral-broadening-free property, seeded by a random fiber laser

Cited by 62 publications

References 40 publications

High-power low spatial coherence random fiber laser

High-power low spatial coherence random fiber laser

High‐power random distributed feedback fiber laser: From science to application

High‐Power Multimode Random Fiber Laser for Speckle‐Free Imaging

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