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Title: Unstable and multiple pulsing can be invisible to ultrashort pulse measurement techniques

Here, multiple pulsing occurs in most ultrashort-pulse laser systems when pumped at excessively high powers, and small fluctuations in pump power in certain regimes can cause unusual variations in the temporal separations of sub-pulses. Unfortunately, the ability of modern intensity-and-phase pulse measurement techniques to measure such unstable multi-pulsing has not been studied. Here we report calculations and simulations finding that allowing variations in just the relative phase of a satellite pulse causes the second pulse to completely disappear from a spectral interferometry for direct electric field reconstruction (SPIDER) measurement. We find that, although neither frequency-resolved optical gating (FROG) nor autocorrelation can determine the precise properties of satellite pulses due to the presence of instability, they always succeed in, at least, seeing the satellite pulses. Also, additional post-processing of the measured FROG trace can determine the correct approximate relative height of the satellite pulse and definitively indicate the presence of unstable multiple-pulsing.
Authors:
ORCiD logo [1] ;  [2] ;  [2]
  1. Georgia Inst. of Technology, Atlanta, GA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Georgia Inst. of Technology, Atlanta, GA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-715085
Journal ID: ISSN 2076-3417; ASPCC7
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Applied Sciences
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2076-3417
Publisher:
MDPI
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ultrafast optics; ultrashort pulse measurement
OSTI Identifier:
1346129