Versatile Raman fiber laser for sodium laser guide star

Zhang, Lei; Jiang, Huawei; Cui, Shuzhen; Hu, Jinmeng; Feng, Yang

doi:10.1002/lpor.201400055

Cited by 89 publications

(49 citation statements)

References 27 publications

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“…They find applications in the distributed amplification of optical signals for telecommunications [56,61], secure key communications [62], and even as astronomical guide stars [63]. They operate via the gain obtained via the Stimulated Raman scattering mechanism in optical fibres, doing away the need of doped fibres and simplifying device construction.…”

Section: Spatio-temporal Dynamics Of Raman Fibre Lasersmentioning

confidence: 99%

Real-Time Intensity Domain Characterization of Fibre Lasers Using Spatio-Temporal Dynamics

2016

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Fibre lasers are light sources that are synonymous with stability. They can give rise to highly coherent continuous-wave radiation, or a stable train of mode locked pulses with well-defined characteristics. However, they can also exhibit an exceedingly diverse range of nonlinear operational regimes spanning a multi-dimensional parameter space. The complex nature of the dynamics poses significant challenges in the theoretical and experimental studies of such systems. Here, we demonstrate how the real-time experimental methodology of spatio-temporal dynamics can be used to unambiguously identify and discern between such highly complex lasing regimes. This two-dimensional representation of laser intensity allows the identification and tracking of individual features embedded in the radiation as they make round-trip circulations inside the cavity. The salient features of this methodology are highlighted by its application to the case of Raman fibre lasers and a partially mode locked ring fibre laser operating in the normal dispersion regime.

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Section: Spatio-temporal Dynamics Of Raman Fibre Lasersmentioning

confidence: 99%

Real-Time Intensity Domain Characterization of Fibre Lasers Using Spatio-Temporal Dynamics

2016

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“…Despite these advantages, challenges remain including suppression of higher-order Stokes and the difficulty of achieving high powers with a narrow linewidth output due to the onset of stimulated Brillouin scattering (SBS) [1][2][3][4][5]. At the kW pumping level, for good conversion efficiency, RFAs require much longer lengths than their Yb-doped fiber counterparts; thus making them more susceptible to SBS.…”

Section: Introductionmentioning

confidence: 98%

Theoretical treatment of modal instability in high-power cladding-pumped Raman amplifiers

Naderi¹,

Dajani

Grosek

et al. 2015

SPIE Proceedings

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Cladding-pumped Raman fiber amplifiers (RFA) have been proposed as gain media to achieve power scaling. It is wellknown that the onset of the modal instability (MI) phenomenon is a limiting factor for achieving higher output powers in Yb-doped fiber amplifiers with good beam quality. In this paper, we present an analytical approach to the investigation of the MI phenomenon in high-power, cladding-pumped RFAs. By utilizing the conservation of the number of photons and the conservation of energy in the absence of loss, the nonlinear equations for the propagation of the pump power and the total signal power can be decoupled from one another. Decoupling lead to exact solutions for the pump power and transverse modes signal powers. Further we investigate various MI suppression techniques including increasing the seed power and gain-tailored design.

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“…Especially, high-power narrow linewidth pulsed 1319 nm laser is extremely important for 589 nm sodium laser using Sum-Frequency Generation (SFG) technique with 1064 nm laser [7][8][9][10][11][12] to efficiently generate sodium Laser Guide Star (LGS) for ground-based telescopes' Adaptive Optics (AO) system [13][14][15][16]. The pulsed output format of the laser is also an easier solution for solving LGS's Rayleigh back-scattering and fratricide problems [17][18][19]. As single LGS has a finite corrected field with only few tens of arc-seconds, it could not meet the need of next-generation large telescopes.…”

Section: Introductionmentioning

confidence: 99%

High-power, kHz-repetition-rate, long-pulse-duration, narrow-linewidth 1319 nm Nd:YAG solid-state laser for a guide star laser system

Bian

Chang

et al. 2018

J. Phys. Commun.

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We propose and demonstrate a new approach to scale the average output power with narrow linewidth and good beam quality simultaneously for a 1319 nm laser. A polarization and sequence pulsed beam combining technology is developed to add two lasers. Each laser is based on a quasi-continuous-wave diode-pumped Nd:YAG master-oscillator power-amplifier system. One provides output power of 81 W with s-polarization, M 2 =1.49, and a repetition rate of 500 Hz. Another also operates at 500 Hz, but delivers power of 78 W with M 2 =1.47 and p-polarization. After combination, a maximum average power of 156 W with beam quality of M 2 =1.5 is achieved, corresponding to a combining efficiency of 98.1%. The combined beam has a 1 kHz repetition rate with 120 μs pulse duration and ∼0.3 GHz linewidth. To the best of our knowledge, this is a record-high output power for the solid-state 1.3 μm lasers. All results indicate the technique of polarization beam in conjunction with sequence pulsed beam combining not only allows the scaling of the laser power while maintaining narrow linewidth and good beam quality, but also is an effective approach for increasing the pulse repetition rate.

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Versatile Raman fiber laser for sodium laser guide star

Cited by 89 publications

References 27 publications

Real-Time Intensity Domain Characterization of Fibre Lasers Using Spatio-Temporal Dynamics

Real-Time Intensity Domain Characterization of Fibre Lasers Using Spatio-Temporal Dynamics

Theoretical treatment of modal instability in high-power cladding-pumped Raman amplifiers

High-power, kHz-repetition-rate, long-pulse-duration, narrow-linewidth 1319 nm Nd:YAG solid-state laser for a guide star laser system

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