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Title: Entirely reflective slit spatial filter for high-energy laser systems

Abstract

An entirely reflective slit spatial filter is proposed to provide spatial filtering, gain isolation, and ASE mitigation for high-energy laser systems. The traditional circular pinhole is replaced by two orthogonal slits, which lowers the intensity at the spatial filter plane by up to two orders of magnitude, and by using reflective optics we reduce spatial dispersion and eliminate B-integral effects. A ray trace model of the spatial filter shows excellent transmitted wavefront, but also indicates aberrations at the foci from using cylindrical optics at 45°. It is expected that the use of off-axis parabolic mirrors would mitigate this issue but comes at the cost of more complicated, expensive optics and more complex alignment. We created a numerical model based on Fourier optics to explain this effect and guide design requirements to mitigate it. High-quality imaging and filtering capabilities are demonstrated experimentally.

Authors:
ORCiD logo; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1565970
Alternate Identifier(s):
OSTI ID: 1568004
Report Number(s):
LLNL-JRNL-758559
Journal ID: ISSN 1094-4087; OPEXFF
Grant/Contract Number:  
17-ERD-033; AC52-07NA27344
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 27 Journal Issue: 19; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Lasers

Citation Formats

Chesnut, K., Bayramian, A., Erlandson, A., Galvin, T., Sistrunk, E., Spinka, T., and Haefner, C. Entirely reflective slit spatial filter for high-energy laser systems. United States: N. p., 2019. Web. doi:10.1364/OE.27.027017.
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Chesnut, K., Bayramian, A., Erlandson, A., Galvin, T., Sistrunk, E., Spinka, T., & Haefner, C. Entirely reflective slit spatial filter for high-energy laser systems. United States. https://doi.org/10.1364/OE.27.027017
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Chesnut, K., Bayramian, A., Erlandson, A., Galvin, T., Sistrunk, E., Spinka, T., and Haefner, C. Wed . "Entirely reflective slit spatial filter for high-energy laser systems". United States. https://doi.org/10.1364/OE.27.027017.
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@article{osti_1565970,
title = {Entirely reflective slit spatial filter for high-energy laser systems},
author = {Chesnut, K. and Bayramian, A. and Erlandson, A. and Galvin, T. and Sistrunk, E. and Spinka, T. and Haefner, C.},
abstractNote = {An entirely reflective slit spatial filter is proposed to provide spatial filtering, gain isolation, and ASE mitigation for high-energy laser systems. The traditional circular pinhole is replaced by two orthogonal slits, which lowers the intensity at the spatial filter plane by up to two orders of magnitude, and by using reflective optics we reduce spatial dispersion and eliminate B-integral effects. A ray trace model of the spatial filter shows excellent transmitted wavefront, but also indicates aberrations at the foci from using cylindrical optics at 45°. It is expected that the use of off-axis parabolic mirrors would mitigate this issue but comes at the cost of more complicated, expensive optics and more complex alignment. We created a numerical model based on Fourier optics to explain this effect and guide design requirements to mitigate it. High-quality imaging and filtering capabilities are demonstrated experimentally.},
doi = {10.1364/OE.27.027017},
journal = {Optics Express},
number = 19,
volume = 27,
place = {United States},
year = {Wed Sep 11 00:00:00 EDT 2019},
month = {Wed Sep 11 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1364/OE.27.027017
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Cited by: 3 works
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Figures / Tables:

Fig. 1 Fig. 1: Diagram of the cylindrical lens spatial filter patented by Erlandson.
All figures and tables (8 total)
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Works referenced in this record:

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    Figures / Tables found in this record:

    Fig. 1 (p. 4)figure
    Fig. 2 (p. 5)figure
    Fig. 3 (p. 6)figure
    Fig. 4 (p. 7)figure
    Fig. 5 (p. 8)figure
    Fig. 6 (p. 9)figure
    Table 1 (p. 9)table
    Fig. 7 (p. 10)figure
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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

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