Unstable and multiple pulsing can be invisible to ultrashort pulse measurement techniques
- Georgia Inst. of Technology, Atlanta, GA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Georgia Inst. of Technology, Atlanta, GA (United States)
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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1346129
- Report Number(s):
- LLNL-JRNL-715085; ASPCC7
- Journal Information:
- Applied Sciences, Vol. 7, Issue 1; ISSN 2076-3417
- Publisher:
- MDPICopyright Statement
- Country of Publication:
- United States
- Language:
- English
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