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Development of infrared sensors using energy transfer/energy upconversion processes: Study of laser excited fluorescence in rare Earth ion doped crystalsA summary is presented of the spectroscopic study of three systems: LaF3:Ho(3+), LaF3:Er(3+) and CaF2:Nd(3+). When the D levels of Ho(3+) in LaF3 were resonantly excited with a laser beam of 640 nm, upconverted emissions were detected from J (416 nm), F (485 nm), and E (546 nm) levels. Energy upconverted emissions were also observed from F and E levels of Ho(3+) when the material was excited with an 800 nm near infrared laser. When the D levels of Er(3+) in LaF3 were resonantly excited with a laser beam of 637 nm, upconverted emissions were detected from the E (540 nm) and P (320, 400, and 468 nm) levels. Energy upconverted emissions were also observed from F, E, and D levels of Er(3+) when the material was resonantly excited with an 804 nm near infrared laser. When the D levels of Nd(3+) in CaF2 were resonantly excited with a laser beam of 577 nm, upconverted emissions were detected from the L (360 and 382 nm), K (418 nm), and I (432 nm) levels. Very weak upconverted emissions were detected when this system was irradiated with a near infrared laser. The numbers in parentheses are the wavelengths of the emissions.
Document ID
19940019600
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Nash-Stevenson, S. K.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Reddy, B. R.
(Alabama A & M Univ. Normal., United States)
Venkateswarlu, P.
(Alabama A & M Univ. Normal., United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1994
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
NASA-TM-108437
NAS 1.15:108437
Accession Number
94N24073
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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