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Title: Design of a 10. 6 micron laser radar transmitter

Abstract

The analysis and design of a 10.6 micron laser radar transmitter is reviewed. This laser radar will serve as a testbed for the development of electrooptic componentry and image recognition software. A number of design problems are defined by the performance constraints. These design problems are analyzed with first-principles modeling and a set of expected performance attributes is determined. The resulting design is discussed in detail and, where possible, commercially available hardware is identified for use in the laser radar design. 10 refs., 9 figs.

Authors:
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (USA)
OSTI Identifier:
5226617
Report Number(s):
SAND-86-0028
ON: DE87000675
DOE Contract Number:
AC04-76DP00789
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; CARBON DIOXIDE LASERS; RADAR; DESIGN; OPTICAL SYSTEMS; PERFORMANCE TESTING; GAS LASERS; LASERS; MEASURING INSTRUMENTS; RANGE FINDERS; TESTING; 420300* - Engineering- Lasers- (-1989)

Citation Formats

Williams, W.D. Design of a 10. 6 micron laser radar transmitter. United States: N. p., 1986. Web.
Williams, W.D. Design of a 10. 6 micron laser radar transmitter. United States.
Williams, W.D. Mon . "Design of a 10. 6 micron laser radar transmitter". United States. doi:.
@article{osti_5226617,
title = {Design of a 10. 6 micron laser radar transmitter},
author = {Williams, W.D.},
abstractNote = {The analysis and design of a 10.6 micron laser radar transmitter is reviewed. This laser radar will serve as a testbed for the development of electrooptic componentry and image recognition software. A number of design problems are defined by the performance constraints. These design problems are analyzed with first-principles modeling and a set of expected performance attributes is determined. The resulting design is discussed in detail and, where possible, commercially available hardware is identified for use in the laser radar design. 10 refs., 9 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 1986},
month = {Mon Sep 01 00:00:00 EDT 1986}
}

Technical Report:
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  • The paper studies the frequency up-conversion process of a 10.6 micron laser in an AgGaS{sub 2} nonlinear crystal, and presents the results of calculating the phase matching angle, the phase matching acceptance angle, and the effective bandwidth of 10.6 micron light. Thus, the frequency conversion of 10.6 micron light to 0.967 micron light is realized. In the nonfocussing mode, the maximum power conversion efficiency is greater than 7%. The eta(theta) and eta(Ip) curves were measured; the optimal phase matching angle is 38 deg 50 min for type II. Multiple factors that affect conversion efficiency are analyzed; the major noise sourcesmore » of the upconversion system of an infrared detector are also analyzed.« less
  • Resonantly enhanced, single-sideband generation in a Stark tunable gas laser was demonstrated, both theoretically and experimentally, for the first time. The theory was developed first; it predicted the possibility of parametric mixing of infrared and microwave radiation in deuterated ammonia (/sup 14/NH/sub 2/D) gas, which would result in down converted single-sideband radiation at the difference frequency. Quantitative prediction of the nonlinear effect was made and is contained in the expression for the induced nonlinear coefficient. Pressure and Doppler broadening effects were accounted for in the coefficient. Successful experimental demonstration of resonantly enhanced, parametric single-sideband generation in /sup 14/NH/sub 2/D gasmore » was made for the first time on this contract during October 1975. The P(20) line at 10.591 micrometers of the /sup 12/C/sup 16/O/sub 2/ laser and microwave at 4.023 GHz were mixed in a microwave-optical Stark cell, yielding a newly generated downconverted wave at 10.593 micrometers, or 944.061/cm. The dependences of the sideband signal on gas pressure, microwave frequency, applied dc field, and microwave power were measured and completely confirmed the theoretical predictions. A second experiment demonstrating resonantly enhanced parametric upconversion in Stark gas was also performed.« less
  • This program represents an effort to demonstrate nonlinear mixing induced in a molecular gas by the application of a dc electric field. In particular, the molecule NH/sub 2/D is considered as a three-level system interacting simultaneously with applied infrared and microwave radiation. A resonant nonlinear interaction occurs resulting in the generation of a third frequency. This process is allowed because of the removal of inversion degeneracy in the gas by the applied field. A new, completely enclosed, ridged waveguide Stark cell was developed. Single sideband parametric conversion at the difference frequency between the incident CO/sub 2/ laser radiation and themore » 4 GHz microwave radiation was accomplished with the modified cell, as predicted. This represents the first observation of resonantly-enhanced Stark-induced two-photon mixing in a gas. The parametric signal was further examined as a function of the Stark voltage, NH/sub 2/D pressure, the microwave frequency and power. The results generally confirm predictions.« less
  • This program addresses an approach which should lead to a new class of electro-optical devices such as single sideband modulators, tunable local oscillators, and frequency shifters, using the resonant interaction of optical and microwave fields in a gas whose energy level structure is controlled by an applied electric field (Stark effect). The molecule NH/sub 2/D has an infrared absorption line which may be tuned into resonance with the P(20) 10.6 micrometer CO/sub 2/ laser transition by application of an electric field. The authors exploited this interaction to frequency stabilize a gigahertz tunable waveguide CO/sub 2/ laser, demonstrating precise control ofmore » the waveguide laser frequency over a bandwidth greater than 1 GHz, and solving one of the major problems in CO/sub 2/ laser frequency control. The experience with these interactions in stark tunable molecules has stimulated the concepts and ideas which are being implemented in this program.« less