USE OF CRYSTAL MATERIAL TO CONTROL THERMO-OPTICAL EFFECT OF OPTICAL PATH

PROBLEM TO BE SOLVED: To control the thermo-optical effect of an optical path in an optical device and system. SOLUTION: The thermo-optical effect of the optical path in the temperature range ΔT is controlled by determining the minimum sensitivity (FOM: figure of merit) of the optical path and incor...

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Bibliographische Detailangaben
Hauptverfasser:	LINES MALCOM ELLIS, KOWACH GLEN ROBERT, HARTMAN ROBERT LOUIS, KOCH THOMAS LAWSON, ACKERMANN DAVID ALAN, BYLSMA RICHARD BENDICKS, SCHNEEMEYER LYNN FRANCES
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DEVICES USING STIMULATED EMISSION ELECTRICITY FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To control the thermo-optical effect of an optical path in an optical device and system. SOLUTION: The thermo-optical effect of the optical path in the temperature range ΔT is controlled by determining the minimum sensitivity (FOM: figure of merit) of the optical path and incorporating a crystal material which can satisfy the conditions designated by the FOM into the path. The crystal material has a specified coefficient of thermal expansion(CTE) and specified refractive index (n) so that the material becomes extremely transparent at the wavelength λof radiation propagating the path and the CTE and dn/dT are matched with each other to obtain sufficient FOM in the range ΔT. In one example, the CTE and dn/dT of the etalon compensate with each other to discriminate frequencies with substantially no temperature sensitivity in the range ΔT. The crystal material consists of LiCaAlF6 in a preferable example of the optical etalon.