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Title: DETERMINING ELECTRO-OPTIC COEFFICIENTS FOR LITHIUM TANTALATE USING AN ELECTRO-OPTIC SCANNING DEVICE

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
784096
Report Number(s):
LA-UR-01-4312
TRN: AH200137%%120
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Jul 2001
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; LITHIUM; TANTALATES; ELECTRO-OPTICAL EFFECTS

Citation Formats

J. L. CASSON, K. T. GAHAGAN, and ET AL. DETERMINING ELECTRO-OPTIC COEFFICIENTS FOR LITHIUM TANTALATE USING AN ELECTRO-OPTIC SCANNING DEVICE. United States: N. p., 2001. Web.
J. L. CASSON, K. T. GAHAGAN, & ET AL. DETERMINING ELECTRO-OPTIC COEFFICIENTS FOR LITHIUM TANTALATE USING AN ELECTRO-OPTIC SCANNING DEVICE. United States.
J. L. CASSON, K. T. GAHAGAN, and ET AL. Sun . "DETERMINING ELECTRO-OPTIC COEFFICIENTS FOR LITHIUM TANTALATE USING AN ELECTRO-OPTIC SCANNING DEVICE". United States. doi:. https://www.osti.gov/servlets/purl/784096.
@article{osti_784096,
title = {DETERMINING ELECTRO-OPTIC COEFFICIENTS FOR LITHIUM TANTALATE USING AN ELECTRO-OPTIC SCANNING DEVICE},
author = {J. L. CASSON and K. T. GAHAGAN and ET AL},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jul 01 00:00:00 EDT 2001},
month = {Sun Jul 01 00:00:00 EDT 2001}
}

Conference:
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  • We demonstrate a ferroelectric optical device based on single crystal LiTaO{sub 3} that can scan a laser beam from the visible to the infrared. It utilizes the electro-optic effect in the ferroelectric that has potentially high intrinsic response times of GHz. There are many applications to such scanning devices in the infrared such as optical switching, spectrometry, microscopy, and sensing. Lithium tantalate has two ferroelectric polarization states that are antiparallel (180{sup o}) to each other. The domain states can be reversed by applying an electric field of {approx}21 kV/mm at room temperature. By reversing the domain structure in the crystal,more » we can create domains in the crystal of almost any desired shape. By creating prism-shaped domain, we can create a ferroelectric deflector or scanner by applying either static or sweeping voltages across the crystal. This scanner is capable of scanning wavelengths from 0.4-5 {micro}m. The scanning performance varied from a total deflection angle of 13.38{sup o} at 1558 nm to 16.18{sup o} at 632.8 nm. Since the amount of deflection of the incoming light is determined by the applied voltage, the electro-optic coefficient and other fixed quantities, by measuring the deflection angle as a function of wavelength, the dispersion of the electro-optic coefficient in lithium tantalate can be determined. In these experiments, the scanner was characterized from the visible (632.8 nm) to midinfrared (1558 nm). Both extraordinary and the ordinary polarizations of light were used, in order to determine the electro-optic coefficients, r{sup 33} and r{sup 31}. Except for the values at 632.8 nm, these values of the electro-optic coefficients have not been previously reported. For lithium tantalate, r{sup 33} at 632.8 nm is reported in the literature as 30.2 pm/V. We found that this decreases to 27.1 pm/V at 1558 nm. For the extraordinary polarization, r{sup 13} varied from 7.55 pm/V (632.8 nm) to 6.84 pm/V (1558 nm).« less
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  • A method is described or controlling and measuring the pulse width of electrical gate pulses used for optical shuttering of image intensifier. The intensifiers are coupled to high frame rate Charge-Coupled-Devices (CCD) or Focus-Projection Scan (FPS) vidicon TV cameras for readout and telemetry of time resolved image sequences. The shutter duration or gate width of individual shutters is measured in real time and encoded in the video frame corresponding to a given shutter interval. The shutter information is updated once catch video frame by strobing new data with each TV camera vertical sync pulse. This circuitry is used in conjunctionmore » with commercial video insertion/annotation equipment to provide die shutter width information in alpha numeric text form along with the time resolved video image on a frame-by-frame basis. The measurement technique and circuitry involving a combination of high speed digital counters and analog integrators for measurements in the Ins to 1024 ns range are described. The accuracy obtained is compared with measurements obtained using batch speed DSOs. The measured data are provided in 10-bit Binary (Bi) and four decades of Binary Coded Decimal (BCD) and also displayed on four digit seven segment displays. The control circuitry including digital and analog input means for gate width selection are described. The implementation of both measurement and control circuitry into an Intensified Shuttered CCD (ISCCD) radiometric system for recording fast shuttered images at RS-170 to 4 KHz frame rates is presented.« less
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