Neural-network-assisted femtosecond laser pulse duration measurement using two-photon absorption

Junbao Chen; Ming Wang; Wei Xia

doi:10.3788/COL202018.121901

Journals >Chinese Optics Letters >Volume 18 >Issue 12 >Page 121901 > Article

Chinese Optics Letters
Vol. 18, Issue 12, 121901 (2020)

Neural-network-assisted femtosecond laser pulse duration measurement using two-photon absorption

Junbao Chen^1、*, Ming Wang², and Wei Xia²

Author Affiliations

¹Department of Information Technology, Nanjing Forest Police College, Nanjing 210023, China

²School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China

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DOI: 10.3788/COL202018.121901 Cite this Article Set citation alerts

Junbao Chen, Ming Wang, Wei Xia. Neural-network-assisted femtosecond laser pulse duration measurement using two-photon absorption[J]. Chinese Optics Letters, 2020, 18(12): 121901 Copy Citation Text

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Abstract

In this work, a neural network (NN) method is developed for pulse duration inferring for an erbium-doped fiber laser at 1550 nm. Experimentally, the interferometric autocorrelation trace is observed clearly with the use of the two-photon absorption (TPA) effect in a GaAs photodiode. The intensity autocorrelation function is curve-fitted by the NN with an appropriate performance, and the measuring accuracy is consistent with a commercial autocorrelator. Compared with the Levenberg–Marquardt curve-fitting method, the NN can retrieve the intensity autocorrelation function more stably and has a certain noise reduction ability, simplifying the signal processing for a TPA photodiode-based autocorrelator.

Keywords

femtosecond laser neural networks pulse duration two-photon absorption

I (τ) = {[E (t) + E (t - τ)]}^{2},

(1)

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V (τ) = m \int_{- \infty}^{\infty} {| {[E (t) + E (t - τ)]}^{2} |}^{2} d t,

(2)

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A (τ) \propto \int [I^{2} (t - τ) + I^{2} (t)] d t + 4 \int I (t - τ) I (t) d t + 2 \int [I (t - τ) + I (t)] E (t) E^{*} (t - τ) d t + c . c . + \int E^{2} (t) E^{* 2} (t - τ) d t + c . c .

(3)

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y = \sum_{i = 1}^{N} w_{i Y} [\sum_{i = 1}^{N} w_{1 i} g_{i} (τ) + b_{j}],

(4)

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g_{i} (x) = \frac{1}{1 + e^{- x}} .

(5)

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MSE = \frac{1}{N} \sqrt{\sum_{i = 1}^{N} {(y_{i}^{'} - y_{i})}^{2}} .

(6)

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Output = 0.84 \cdot Target + 0.082,

(7)

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Junbao Chen, Ming Wang, Wei Xia. Neural-network-assisted femtosecond laser pulse duration measurement using two-photon absorption[J]. Chinese Optics Letters, 2020, 18(12): 121901

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