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Title: A compact, short-pulse laser for near-field, range-gated imaging

Abstract

This paper describes a compact laser, which produces high power, wide-angle emission for a near-field, range-gated, imaging system. The optical pulses are produced by a 100 element laser diode array (LDA) which is pulsed with a GaAs, photoconductive semiconductor switch (PCSS). The LDA generates 100 ps long, gain-switched, optical pulses at 904 nm when it is driven with 3 ns, 400 A, electrical pulses from a high gain PCSS. Gain switching is facilitated with this many lasers by using a low impedance circuit to drive an array of lasers, which are connected electrically in series. The total optical energy produced per pulse is 10 microjoules corresponding to a total peak power of 100 kW. The entire laser system, including prime power (a nine volt battery), pulse charging, PCSS, and LDA, is the size of a small, hand-held flashlight. System lifetime, which is presently limited by the high gain PCSS, is an active area of research and development. Present limitations and potential improvements will be discussed. The complete range-gated imaging system is based on complementary technologies: high speed optical gating with intensified charge coupled devices (ICCD) developed at Los Alamos National Laboratory (LANL) and high gain, PCSS-driven LDAs developed at Sandiamore » National Laboratories (SNL). The system is designed for use in highly scattering media such as turbid water or extremely dense fog or smoke. The short optical pulses from the laser and high speed gating of the ICCD are synchronized to eliminate the back-scattered light from outside the depth of the field of view (FOV) which may be as short as a few centimeters. A high speed photodiode can be used to trigger the intensifier gate and set the range-gated FOV precisely on the target. The ICCD and other aspects of the imaging system are discussed in a separate paper.« less

Authors:
; ;  [1]; ; ;  [2]
  1. Sandia National Labs., Albuquerque, NM (United States)
  2. Los Alamos National Lab., NM (United States)
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
418481
Report Number(s):
SAND-96-0993C; CONF-9610181-6
ON: DE97000888; TRN: AHC29702%%97
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 22. international congress on high speed photography and photonics, Santa Fe, NM (United States), 28 Oct 1996; Other Information: PBD: [1996]
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; SEMICONDUCTOR LASERS; DESIGN; OPTICAL RADAR; LASER RADIATION; GALLIUM ARSENIDES; ELECTROMAGNETIC PULSES; IMAGES; CHARGE-COUPLED DEVICES; SWITCHES

Citation Formats

Zutavern, F.J., Helgeson, W.D., Loubriel, G.M., Yates, G.J., Gallegos, R.A., and McDonald, T.E. A compact, short-pulse laser for near-field, range-gated imaging. United States: N. p., 1996. Web.
Zutavern, F.J., Helgeson, W.D., Loubriel, G.M., Yates, G.J., Gallegos, R.A., & McDonald, T.E. A compact, short-pulse laser for near-field, range-gated imaging. United States.
Zutavern, F.J., Helgeson, W.D., Loubriel, G.M., Yates, G.J., Gallegos, R.A., and McDonald, T.E. Tue . "A compact, short-pulse laser for near-field, range-gated imaging". United States. https://www.osti.gov/servlets/purl/418481.
@article{osti_418481,
title = {A compact, short-pulse laser for near-field, range-gated imaging},
author = {Zutavern, F.J. and Helgeson, W.D. and Loubriel, G.M. and Yates, G.J. and Gallegos, R.A. and McDonald, T.E.},
abstractNote = {This paper describes a compact laser, which produces high power, wide-angle emission for a near-field, range-gated, imaging system. The optical pulses are produced by a 100 element laser diode array (LDA) which is pulsed with a GaAs, photoconductive semiconductor switch (PCSS). The LDA generates 100 ps long, gain-switched, optical pulses at 904 nm when it is driven with 3 ns, 400 A, electrical pulses from a high gain PCSS. Gain switching is facilitated with this many lasers by using a low impedance circuit to drive an array of lasers, which are connected electrically in series. The total optical energy produced per pulse is 10 microjoules corresponding to a total peak power of 100 kW. The entire laser system, including prime power (a nine volt battery), pulse charging, PCSS, and LDA, is the size of a small, hand-held flashlight. System lifetime, which is presently limited by the high gain PCSS, is an active area of research and development. Present limitations and potential improvements will be discussed. The complete range-gated imaging system is based on complementary technologies: high speed optical gating with intensified charge coupled devices (ICCD) developed at Los Alamos National Laboratory (LANL) and high gain, PCSS-driven LDAs developed at Sandia National Laboratories (SNL). The system is designed for use in highly scattering media such as turbid water or extremely dense fog or smoke. The short optical pulses from the laser and high speed gating of the ICCD are synchronized to eliminate the back-scattered light from outside the depth of the field of view (FOV) which may be as short as a few centimeters. A high speed photodiode can be used to trigger the intensifier gate and set the range-gated FOV precisely on the target. The ICCD and other aspects of the imaging system are discussed in a separate paper.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {12}
}

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