Temporal contrast reduction techniques for high dynamic-range temporal contrast measurement

Shen, Xiong; Wang, Peng; Zhu, Jingxin; Si, Zhe; Zhao, Yuxia; Li, Jun; Li, Ruxin

doi:10.1364/oe.27.010586

Cited by 6 publications

(2 citation statements)

References 65 publications

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“…Liu et al [ 21 ] demonstrated spatial cleanup, namely M 2 beam parameter reduction via the KL, induced by a short pulse in a multi-mode graded-index fiber. Against most of the CE efforts, intentional reduction of the pulse contrast via the KL effect was demonstrated in 2019 [ 22 ] with the purpose of measuring high pulse contrast with limited diagnostics. The current study follows an alternative path to the latter, which with some further modification, can achieve pulse CE.…”

Section: Introductionmentioning

confidence: 99%

A simple method for pulse contrast enhancement via self-focusing

Refaeli,

Marcus,

Shamir

2023

High Pow Laser Sci Eng

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Here we report on a simple-to-implement and cost-effective approach for laser pulse contrast enhancement, based on the χ (3) nonlinear self-focusing effect. An intentionally induced and gently controlled self-focusing in a thin glass transforms the time-dependent intensity into variation in beam divergence. Followed by a spatial discriminating filter, only the strongly focused fraction traverses the setup, at the expense of efficiency. A numerical model, accounting for the pulse and material parameters via a Gaussian ABCD matrix, provides an estimate for the instantaneous beam waist and transmission efficiency, which enables us to evaluate the resulting contrast enhancement. The estimated contrast enhancement spans between 0.5 and 2.5 orders of magnitude, in conjunction with approximately 25%-90% estimated efficiency, depending on the pulse parameters. In a preliminary experiment we demonstrated the effect with 10s-µJ sub GW regime with approximately 40% efficiency and a contrast improvement of more than or equal to 20 dB.

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Section: Introductionmentioning

confidence: 99%

A simple method for pulse contrast enhancement via self-focusing

Refaeli,

Marcus,

Shamir

2023

High Pow Laser Sci Eng

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“…However, the dynamic range is limited by the signal to noise ratio of the detector and, at present, the highest achievable value is 10 8 . Together with the temporal contrast reduction method, 10 9 dynamic range can be obtained by using SRSI-ETE recently [21].…”

Section: Introductionmentioning

confidence: 99%

Single-shot fourth-order autocorrelator

et al. 2019

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a These authors contributed equally to the work. Abstract:The temporal contrast is one of the most important parameters of an ultra-high intense laser pulse. Third-order auto-correlator or cross-correlator have been widely used to characterize the temporal contrast of an ultra-intense laser pulse in the past decades. Here, a novel and simple single-shot fourth-order auto-correlator to characterize the temporal contrast with higher time resolution and better pulse contrast fidelity in comparison to third-order correlators is proposed. The single-shot fourth-order autocorrelation consists of a frequency degenerate four-wave mixing process and a sum-frequency mixing process. The proof-ofprinciple experiments show that a dynamic range of approximately 10 11 , a time resolution of approximately 160 fs, and a time window of 65 ps can be successfully obtained using the novel single-shot fourth-order auto-correlator, which is the highest dynamic range with simultaneous high time resolution for single-shot temporal contrast measurement so far.

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High-performance single-shot fourth-order auto-correlator with real-time accuracy self-validation

Wang

Shen

Xuan

et al. 2022

Applied Physics Letters

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An improved single-shot fourth-order auto-correlator for temporal contrast measurement is proposed, in which spectral broadening based on self-phase modulation, followed by spectral filtering, is used for sampling pulse generation. When the input pulse energy is 5.5 mJ, the device has a measurement dynamic range of 3 × 10−11, a temporal resolution of approximately 200 fs, and a time window of 68 ps in a single shot. In addition, benefiting from the sCMOS camera data acquisition system, the measurement accuracy is self-verified using simply a tilted glass plate in the optical path of the sampling pulse. Since there is only one input beam without spatiotemporal overlap during sampling pulse generation, the setup is stable and easy to adjust.

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Temporal contrast reduction techniques for high dynamic-range temporal contrast measurement

Cited by 6 publications

References 65 publications

A simple method for pulse contrast enhancement via self-focusing

A simple method for pulse contrast enhancement via self-focusing

Single-shot fourth-order autocorrelator

High-performance single-shot fourth-order auto-correlator with real-time accuracy self-validation

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