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

show less

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," Chin. Opt. Lett. 18, 121901 (2020) Copy Citation Text

EndNote(RIS)

BibTex

Plain Text

show less

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)

View in Article

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

(2)

View in Article

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)

View in Article

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

(4)

View in Article

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

(5)

View in Article

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

(6)

View in Article

Output = 0.84 \cdot Target + 0.082,

(7)

View in Article

Junbao Chen, Ming Wang, Wei Xia, "Neural-network-assisted femtosecond laser pulse duration measurement using two-photon absorption," Chin. Opt. Lett. 18, 121901 (2020)

Download Citation

EndNote(RIS)

BibTex

Plain Text

Set citation alerts for the article

Tools

Set citation alerts for the article

Save the article for my favorites

Paper Information