Nonlinear Generation of Ultra-Flat Broadened Spectrum Based on Adaptive Pulse Shaping

Yang, Xin; Richardson, David J.; Petropoulos, P.

doi:10.1109/jlt.2012.2193383

Cited by 24 publications

(7 citation statements)

References 13 publications

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“…Further, transform limited pulses may not even be the optimal solution in all systems. This has been the case in a previous work in a system based on mode locked lasers [25] where a broadened pulse with considerable chirp is obtained as the optimal solution. Thus, the best approach to enhance the spectral broadening is in a closed loop system without any limitations on the possible spectral phases.…”

Section: Adaptive Optimization For Bandwidth Scalingmentioning

confidence: 86%

“…The search space i.e. the extent of perturbation is controlled by the standard deviation of the perturbation vector and is updated according to one-fifth rule [25] [30] with a 10% change. The number of iterations before search space updation depends on the number of variables to be optimized and is made equal to the number of spectral phases to be optimized.…”

Section: Methodsmentioning

confidence: 99%

“…However, the determination of optimum phase profile for a given system is not a convex optimization problem and the search space is vast. Adaptive optimization has been used to solve such problems in various applications like phase distortion correction of wave front [22], beam combining [23], phase correction for distorted orbital angular momentum beams [24] and also for BW scaling [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…In [25], spectral phase of transform limited gaussian pulses from a mode locked laser-based frequency comb was optimized with evolutionary strategy algorithms to increase BW by defining the phase perturbations with a weighted Chebyshev polynomial sum. The optimized pulse shape in this system has considerable chirp and deviates significantly from a transform limited pulse which was the initial pulse shape.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, limiting the pulse profile to a specific shape such as a gaussian [26] is not always optimal for spectral broadening. Further, it has been shown that the optimal pulse shape can be far from a transform limited pulse [25]. Thus, closed loop systems that evolve the pulse profile according to the prevailing system parameters are necessary to achieve consistent spectral broadening under various operating conditions.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced nonlinear spectral broadening and sub-picosecond pulse generation by adaptive spectral phase optimization of electro-optic frequency combs

et al. 2020

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We utilize adaptive optimization to enhance the spectral broadening of an amplified electro-optic frequency comb with a 25 GHz repetition rate in a highly nonlinear fiber and subsequently generate sub-picosecond pulses. The spectral phase of the comb is adaptively optimized by a Fourier pulse shaper in a closed control loop with the HNLF output spectrum as the process variable to be optimized. Enhanced spectral broadening also increases the stimulated Brillouin scattering threshold allowing increased power scaling and thereby boosting the bandwidth by a factor of more than 13 times over the initial comb. System versatility to varying conditions is demonstrated by achieving consistent bandwidth enhancement (nearly or more than 100 lines) in varying operating conditions that distort the temporal profile of the comb. In all cases, the optimization yields a near transform limited pulse that enters the nonlinear fiber. Sub-picosecond pulse generation is achieved with a short length of single mode fiber post the nonlinear fiber.

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Section: Adaptive Optimization For Bandwidth Scalingmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced nonlinear spectral broadening and sub-picosecond pulse generation by adaptive spectral phase optimization of electro-optic frequency combs

et al. 2020

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Widely Tunable Femtosecond Sources with Continuously Tailorable Bandwidth Enabled by Self‐Phase Modulation

Chou

Hung

Liu

et al. 2023

Laser & Photonics Reviews

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Generating ultrafast pulses with better spectrotemporal control is crucial for optimizing and characterizing nonlinear light–matter responses, yet it is limited by the gain bandwidth of laser media or the phase‐matching geometry of nonlinear processes. This work proposes a simple approach to independently manage a femtosecond source's spectral location and bandwidth. Self‐phase‐modulation‐enabled spectral broadening is first analyzed, which is potentially energy‐scalable using hollow‐core capillaries or multipass cells. It is demonstrated that the outmost lobes in the broadened spectrum show different dependencies on the initial pulse energy and duration. A simple yet effective toy model is introduced that successfully predicts broadband spectral tuning, and the impact of other nonlinear effects, dispersion, and input pulse asymmetry on the experimental scenario is also discussed. Thus a fiber‐based versatile source is demonstrated, which is compressible down to its transform‐limit duration, as short as 12.2 fs centered at 920 nm. In addition, bandwidth‐dependent third‐harmonic generation spectroscopy is performed from a dielectric metasurface with an optimized nonlinear response, and the dependency of laser bandwidth and pulse duration is investigated on the signal‐to‐background ratio of two‐photon images. It is believed that this demonstration will advance the investigation of bandwidth‐dependent nonlinear spectroscopy and microscopy.

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Silica based highly nonlinear fibers to generate parabolic self-similar pulses

2015

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Nonlinear Generation of Ultra-Flat Broadened Spectrum Based on Adaptive Pulse Shaping

Abstract: Abstract:We report a technique to nonlinearly generate precise spectral shapes in an adaptable and power-efficient fashion. The generation of a spectrum with a 7-nm 0.5-dB bandwidth is demonstrated to prove the validity of the approach.

Cited by 24 publications

References 13 publications

Enhanced nonlinear spectral broadening and sub-picosecond pulse generation by adaptive spectral phase optimization of electro-optic frequency combs

Enhanced nonlinear spectral broadening and sub-picosecond pulse generation by adaptive spectral phase optimization of electro-optic frequency combs

Widely Tunable Femtosecond Sources with Continuously Tailorable Bandwidth Enabled by Self‐Phase Modulation

Silica based highly nonlinear fibers to generate parabolic self-similar pulses

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