Multimode Random Fiber Laser for Speckle-Free Imaging

Ma, Rui; Rao, Yu; Zhang, Wei Li; Hu, Bo

doi:10.1109/jstqe.2018.2833472

Cited by 106 publications

(40 citation statements)

References 32 publications

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“…[ 17 ] The decoherence of laser in random cavities has also shown good performance for speckle free imaging. [ 18,19 ] By changing the macroscopic boundary size of the cavities and surface roughness of the natural structures, which simulate the scattering elements with arbitrary amplitude and phase distribution, coherent or incoherent feedback lasers can be generated. [ 20,21 ]…”

Section: Introductionmentioning

confidence: 99%

Single‐Shot Interaction and Synchronization of Random Microcavity Lasers

Zhu

Zhang

et al. 2021

Adv Materials Technologies

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Control coupling and synchronization of lasers has been a promising topic, while complex lasers in disordered system make this more challenging and interesting for their potential applications in the internet of everything. Here, a way to realize the interaction and synchronization of random microcavity lasers, is proposed. The lasers are developed based on homemade amorphous microcavities, performing as nodes that can work in a single‐shot coherent random lasing regime. The nodes connect with each other by multimode fibers with variable coupling strength, and their multiple lasing modes can be well‐synchronized pulse‐by‐pulse through injection locking. A spectral coding method is demonstrated, providing an attractive way to generate and share information between disordered nodes. The synchronization is also extended to a one‐to‐many network, laying a solid foundation for the study of photonic interconnection and networking of complex systems.

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Section: Introductionmentioning

confidence: 99%

Single‐Shot Interaction and Synchronization of Random Microcavity Lasers

Zhu

Zhang

et al. 2021

Adv Materials Technologies

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“…Using a static DOE or diffuser can only produce a finite number of diffracted subbeams, and its speckle reduction ability is insufficient. To use a static multimode optical fiber or a light pipe to reduce speckles completely, a sufficient length (approximately a few hundred meters) and a large numerical aperture are required [17], [18].…”

Section: Introductionmentioning

confidence: 99%

Compound Speckle Reduction in Laser Imaging Systems by Using a Vibrating Multimode Fiber and a Tracked Moving Flexible DOE Loop

Zhou

Liu

et al. 2021

IEEE Access

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The speckle phenomenon produced by coherent waves interfering with each other is undesirable in laser imaging systems. For each of the laser speckle reduction methods in the literature, it is difficult to reduce speckle to an extremely low level (<3%) and also ensure good image quality. Therefore, a compound speckle reduction method based on the combination of a vibrating multimode fiber and a tracked moving flexible DOE loop is proposed and demonstrated for the first time. We have experimentally demonstrated the effectiveness of the proposed compound method, which can reduce the speckle contrast to 1.96% and obtain good spot quality. The relationship between the time-averaging effect of the speckle patterns from a vibrating multimode fiber and from a tracked moving DOE loop is discussed thoroughly. Our experimental results are in good agreement with Goodman's speckle theory. We expect that the compound speckle reduction method we proposed will have promising potential for applications in laser imaging systems.

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“…[22] They have been widely studied in aspects of high power and low noise during the past decade, [23][24][25] and applied in areas of telecommunications, distributed sensing, and imaging. [26][27][28][29] Compared with ASE sources, RFLs have much higher spectral density and narrower bandwidth, which can perform as effective pump lasers to excite Raman gain for mode locking without complex pretreatment. 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.…”

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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Multimode Random Fiber Laser for Speckle-Free Imaging

Cited by 106 publications

References 32 publications

Single‐Shot Interaction and Synchronization of Random Microcavity Lasers

Single‐Shot Interaction and Synchronization of Random Microcavity Lasers

Compound Speckle Reduction in Laser Imaging Systems by Using a Vibrating Multimode Fiber and a Tracked Moving Flexible DOE Loop

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

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