Gain-Phase Modulation in Chirped-Pulse Amplification

Shen, Yijie; Gao, Ge; Meng, Yuan; Fu, Xing; Gong, Mali

doi:10.1364/nlo.2019.nth2b.6

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…As a result, quantum analogies are not limited to free-space light beams. For instance, the Schrödinger equation and related processing methods were also extended to study the classical light behavior in fibers [45,46], nonlinear media [47,48], complex waveguide systems [49,50]. More typical examples and details will be reviewed in the following sections.…”

Section: Analogies Between Quantum and Classical Statesmentioning

confidence: 99%

Nonseparable states of light: From quantum to classical

Shen,

Rosales-Guzmán

2022

Preprint

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Controlling the various degrees-of-freedom (DoFs) of structured light at both quantum and classical levels is of paramount importance in optics. It is a conventional paradigm to treat diverse DoFs separately in light shaping. While, the more general case of nonseparable states of light, in which two or more DoFs are coupled in a nonseparable way, has become topical recently. Importantly, classical nonseparable states of light are mathematically analogue to quantum entangled states. Such similarity has hatched attractive studies in structured light, e.g. the spin-orbit coupling in vector beams. However, nonseparable classical states of light are still treated in a fragmented fashion, while its forms are not limited by vector beams and its potential is certainly not fully exploited. For instance, exotic space-time coupled pulses nontrivial light shaping towards ultrafast time scales, and ray-wave geometric beams provide new dimensions in optical manipulations. Here we provide a bird's eye view on the rapidly growing but incoherent body of work on general nonseparable states involving various DoFs of light and introduce a unified framework for their classification and tailoring, providing a perspective on new opportunities for both fundamental science and applications.

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Section: Analogies Between Quantum and Classical Statesmentioning

confidence: 99%

Nonseparable states of light: From quantum to classical

Shen,

Rosales-Guzmán

2022

Preprint

Self Cite

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“…[17] and amplified according to the theory mentioned in Ref. [18]. The original spectra of these two light sources are manifested in Fig.…”

Section: Simulation and Experimentsmentioning

confidence: 99%

Effect of Phase Relations on Speckle Pattern: Simulation and Measurement

Zhang

Deng

et al. 2019

IEEE Photonics J.

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Speckle is an important phenomenon in various applications. It can be quantified by speckle contrast. However, at present, the influence of the phase relations among the various wavelengths on speckle contrast is rarely analyzed theoretically. Herein, a thorough method for numerically simulating the speckle pattern is presented to considering the impact of relative phase relations among wavelengths on speckle contrast. This method contains spectral shape, spectral width, and phase relations. In addition, a superluminescent pulse amplifier (SPA) with 6.5-nm bandwidth and a mode-locked laser (MLL) with 21-nm bandwidth are established to conduct the verification experiment. The experimental results show that the SPA light attains lower speckle contrast even with a narrower bandwidth than the MLL light. It is manifested that relative phase relations among wavelengths has significant effect on speckle contrast, and chaotic phase relations could be more advantageous for reducing speckle than just a broad spectrum. The simulation results agree well with experimental results. Therefore, this thorough method could provide a reliable approach to describe the characteristics of speckle pattern caused by broadband light carrying phase information. Considering the speckle contrast is positively proportional to optical coherence, this method could also be used to analyze the coherence of partially coherent light.

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“…However, the duration of an ultrashort pulse is always much shorter than the response time of the gain medium; thus, the instantaneous gain used in these models may not be precise. The model proposed by Shen et al uses a separate gain operator to simulate the space-time-frequency-dependent gain, but the ASE is neglected [20]. These models are aimed at simulating the amplification in high-repetition-rate fiber lasers, in which the population inversion is assumed to reach a steady state, because the interval between the signal pulses is much shorter than the upper level lifetime (denoted by τ ) of the excited ions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Model of Chirped Pulse Amplification in Pulsed Synchronously Pumped Low-Repetition-Rate Fiber Amplifiers

Zhang

Deng

et al. 2021

IEEE Photonics J.

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We propose a numerical model to simulate amplification in a pulsed synchronously pumped chirped pulse amplifier (CPA) operating at a low repetition rate. The generalized nonlinear Schrödinger equation and dynamic rate equations are employed to facilitate an accurate treatment of time-space-dependent-gain, wavelength-dependent saturation energy, nonlinearity, and dispersion. Because of an accurate instantaneous gain term, the model can adequately explain pulse distortion and spectral redshift during amplification. The bidirectional amplified spontaneous emission, final output energy, and evolution of temporal and spectral intensities are also investigated through simulations. In addition, a pulsed synchronously pumped CPA fiber system is estbalished to validate the model. The experimental results for the wave shape, spectrum and energy show excellent agreement with those of simulations.

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Gain-Phase Modulation in Chirped-Pulse Amplification

Cited by 3 publications

References 8 publications

Nonseparable states of light: From quantum to classical

Nonseparable states of light: From quantum to classical

Effect of Phase Relations on Speckle Pattern: Simulation and Measurement

Numerical Model of Chirped Pulse Amplification in Pulsed Synchronously Pumped Low-Repetition-Rate Fiber Amplifiers

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