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Title: Pulse contrast enhancement via non-collinear sum-frequency generation with the signal and idler of an optical parametric amplifier

Journal Article · · Applied Physics Letters
DOI: https://doi.org/10.1063/1.5108911 · OSTI ID:1515838
ORCiD logo [1];  [2];  [2];  [2];  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS); SLAC National Accelerator Laboratory
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)

We outline an approach for improving the temporal contrast of a high-intensity laser system by >8 orders of magnitude using non-collinear sum-frequency generation with the signal and idler of an optical parametric amplifier. We demonstrate the effectiveness of this technique by cleaning pulses from a millijoule-level chirped-pulse amplification system to provide >1012 intensity contrast relative to all pre-pulses and amplified spontaneous emission >5 ps prior to the main pulse. The output maintains percent-level energy stability on the time scales of a typical user experiment at our facility, highlighting the method's reliability and operational efficiency. After temporal cleansing, the pulses are stretched in time before seeding two multi-pass, Ti:sapphire-based amplifiers. After re-compression, the 1 J, 40 fs (25 TW) laser pulses maintain a >10^10 intensity contrast >30 ps prior to the main pulse. This technique is both energy-scalable and appropriate for preparing seed pulses for a TW- or PW-level chirped-pulse amplification laser system.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1515838
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 22 Vol. 114; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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