1,721,019 research outputs found
Robust phase retrieval using group-delay-dispersion-scanned second harmonic generation demonstrated in a femtosecond fiber chirped-pulse amplification system
No full textWe propose and demonstrate a phase retrieval method using a novel variant of the dispersion scan (‘d-scan’) technique via both simulations and experimental measurements on a femtosecond fiber laser. The method combines a map of group-delay-dispersion-scanned (d-scan) second-harmonic generation (SHG) spectra together with the fundamental spectrum as inputs. In order to ensure the technique is robust when pulse-to-pulse fluctuations are present, we use only the wavelengths of the resulting SHG peaks, and avoid the areas with low signal in the borders of the data trace. Simulations confirmed the phase-retrieval is accurate even with high levels of laser fluctuation. The trade-off is that pulses which have abruptly changing or highly modulated phase profiles are not retrievable. The d-scan uses the compressor gratings intrinsic to the fiber chirped-pulse amplification (CPA) systems so the method is low cost. For experimental verification, we used a 470 fs ytterbium-fiber CPA system, so the method is applicable to measurements on industrial fs fiber laser systems which generally have an order of magnitude less bandwidth than the Ti:sapphire lasers used to test earlier variants of the d-scan approach
Dataset for Photodarkening-Induced Phase Distortions And Their Effects In Single-Channel And Coherently Combined Yb-Doped Fiber Chirped Pulse Amplification Systems
No full textThis dataset supports the article entitled "Photodarkening-Induced Phase Distortions And Their Effects In Single-Channel And Coherently Combined Yb-Doped Fiber Chirped Pulse Amplification Systems", to be submitted to Journal of Lightwave Technology</span
Photodarkening-induced phase distortions and their effects In single-channel and coherently combined Yb-doped fiber chirped pulse amplification systems
No full textWe use numerical simulations to investigate the effects of photodarkening (PD) on pulse compression and coherent combination following chirped-pulse amplification in Yb-doped fiber amplifiers. Even though we increase the pump power to keep the pulse energy constant, PD degrades the pulses due to phase distortions resulting from heating acting already within a pulse as well as to increased self-phase modulation if the fiber length is optimized for the PD-free fiber at beginning of life. By contrast, in a fiber shorter than this, the drop in peak power is a relatively modest 35% even at a PD propagation loss as large as 5 dB, thus providing effective mitigation against PD-induced phase distortions. The improvements extend to the combination efficiency of beam-combined systems
Dataset for Single-shot phase measurement and fluctuation analysis on ns fiber amplifier
No full textThis dataset supports the article entitled "Single-shot phase measurement and fluctuation analysis on ns fiber amplifier", to be submitted to CLEO 2018.</span
Dataset for Robust phase retrieval using group-delay-dispersion-scanned second harmonic generation demonstrated in a femtosecond fiber chirped-pulse amplification system
No full textThis dataset supports the article entitled " Robust phase retrieval using group-delay-dispersion-scanned second harmonic generation demonstrated in a femtosecond fiber chirped-pulse amplification system", to be submitted to Journal of Quantum Electonics</span
Single-shot phase and amplitude fluctuations of narrow-linewidth pulse bursts in divided pulse amplifier
No full textWe demonstrate single-shot temporal-based interferometric phase measurements for bursts of 35 pulses of 1-ns duration in an Yb-doped fiber amplifier chain seeded by a 1063-nm single-frequency diode laser and operating in a highly nonlinear and saturated regime. We determined a maximum intra-pulse phase distortion ( -integral) of 21.2 rad by mixing the burst with a reference. The difference in the B-integral between the first and last pulse in the burst was large, 12.8 rad, but can be compensated for. Moreover, burst-to-burst amplitude fluctuations (standard deviation, std) were below 6%, where phase fluctuations were ~0.6 rad (std) or less. Even if these fluctuations cannot be compensated for, they still allow for efficient coherent combination, which opens up for transform-limited or narrow-line high-energy divided-pulse amplification with single-frequency seeding
Dataset for Single-Shot Phase and Amplitude Fluctuations of Narrow-Line Pulse Bursts in Divided-Pulse Amplifier
No full textThis dataset supports the article Lin, H., Feng, Y., Price, J., & Nilsson, J. (2019). Single-shot phase and amplitude fluctuations of narrow-linewidth pulse bursts in divided pulse amplifier. IEEE Photonics Technology Letters, 31(20), 1662 - 1665. DOI: 10.1109/LPT.2019.2942175</span
Dataset for 405 W Erbium-Doped Large-Core Fiber Laser
No full textThis dataset supports the article entitled "405 W Erbium-Doped Large-Core Fiber Laser", published at OSA Laser Congress: Advanced Solid State Lasers 2017, Nagoya, Japan, 01-05 Oct 2017.</span
Ultrashort pulse generation in modeless laser cavity
No full textWe demonstrate experimentally that random phase modulation of an erbium-doped fiber ring-laser by an intra-cavity electro-optic phase modulator did not inhibit ultrashort-pulse operation. Stable and self-starting ultrashort-pulse operation with a single pulse circulating in the cavity was achieved even when the phase modulator was driven with random sequences sufficiently fast and strong to render the laser cavity modeless, in the sense that heterodyning of the laser output did not show any spectral lines corresponding to a mode spectrum. No significant change in measured pulse characteristics was observed, compared to conventional mode-locking in the unmodulated cavity. The insensitivity to the random phase modulation is expected, given the lack of phase-sensitive elements in the cavity
Numerical analysis on the influence of photo darkening heating induced phase distortion on fiber coherent combining CPA scheme
No full textWe use numerical simulations to investigate the effects of photodarkening (PD) on single-channel and coherently combined Yb-doped Fiber CPA Systems. The system design optimizing for the lossy fiber caused by PD at ending of life shows improvements on both pulse compression and combining efficiency
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