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Title: Enhancement of THz generation by feedback-optimized wavefront manipulation

Here, we apply active feedback optimization methods to pyroelectric measurements of a THz signal generated by four wave mixing in air using 1 mJ to 12 mJ, 35 fs laser pulses operating at 1/2 kHz repetition rate. A genetic algorithm, using the THz signal as a figure of merit, determines the voltage settings to a deformable mirror and results in up to a 6 fold improvement in the THz signal compared with settings optimized for the best focus. It is possible to optimize for different THz generation processes using this technique.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Center for Ultrafast Optical Science (CUOS)
  2. Univ. of Electronic Science and Technology of China, Chengdu (China). School of Physical Electronics
Publication Date:
Grant/Contract Number:
SC0008352; FA9550-12-1-0310
Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 15; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org:
USDOE Office of Science (SC); US Air Force Office of Scientific Research (AFOSR)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1463884

Hah, J., Jiang, W., He, Z-H., Nees, J. A., Hou, B., Thomas, A. G. R., and Krushelnick, K.. Enhancement of THz generation by feedback-optimized wavefront manipulation. United States: N. p., Web. doi:10.1364/OE.25.017271.
Hah, J., Jiang, W., He, Z-H., Nees, J. A., Hou, B., Thomas, A. G. R., & Krushelnick, K.. Enhancement of THz generation by feedback-optimized wavefront manipulation. United States. doi:10.1364/OE.25.017271.
Hah, J., Jiang, W., He, Z-H., Nees, J. A., Hou, B., Thomas, A. G. R., and Krushelnick, K.. 2017. "Enhancement of THz generation by feedback-optimized wavefront manipulation". United States. doi:10.1364/OE.25.017271. https://www.osti.gov/servlets/purl/1463884.
@article{osti_1463884,
title = {Enhancement of THz generation by feedback-optimized wavefront manipulation},
author = {Hah, J. and Jiang, W. and He, Z-H. and Nees, J. A. and Hou, B. and Thomas, A. G. R. and Krushelnick, K.},
abstractNote = {Here, we apply active feedback optimization methods to pyroelectric measurements of a THz signal generated by four wave mixing in air using 1 mJ to 12 mJ, 35 fs laser pulses operating at 1/2 kHz repetition rate. A genetic algorithm, using the THz signal as a figure of merit, determines the voltage settings to a deformable mirror and results in up to a 6 fold improvement in the THz signal compared with settings optimized for the best focus. It is possible to optimize for different THz generation processes using this technique.},
doi = {10.1364/OE.25.017271},
journal = {Optics Express},
number = 15,
volume = 25,
place = {United States},
year = {2017},
month = {7}
}