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• Chinese Optics Letters
• Vol. 20, Issue 3, 031404 (2022)
Jin Li1, Yanbo Dou1, Lixin Wang2, Jinhai Zou1, Yu Ding2, Hang Wang1, Qiujun Ruan1, Zhipeng Dong1, and Zhengqian Luo1、*
Author Affiliations
• 1Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
• 2Science and Technology on Electro-Optical Information Security Control Laboratory, Tianjin 300308, China
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Abstract

Conventional ultrashort pulsewidth measurement technology is autocorrelation based on second-harmonic generation; however, nonlinear crystals and bulky components are required, which usually leads to the limited wavelength range and the difficult adjustment with free-space light alignment. Here, we proposed a compact all-fiber pulsewidth measurement technology based on the interference jitter (IJ) and field-programmable gate array (FPGA) platform, without requiring a nonlinear optical device (e.g., nonlinear crystal/detector). Such a technology shows a wide measurement waveband from 1 to 2.15 µm at least, a pulsewidth range from femtoseconds to 100 ps, and a small relative error of 0.15%–3.8%. In particular, a minimum pulse energy of 219 fJ is experimentally detected with an average-power-peak-power product of $1.065×10-6 W2$. The IJ-FPGA technology may offer a new route for miniaturized, user-friendly, and broadband pulsewidth measurement.

1. Introduction

Ultrafast lasers are widely used in many fields, such as biomedicine[1], material processing[2], optical communications[3], Lidar[4], and scientific research[5,6]. Most of these applications need to clearly know the parameters (e.g.,  pulsewidth and phase) of ultrashort laser pulses, and it is important to accurately measure the pulse width and phase information of the ultrashort laser[7].