Energy transfer and non-linear optical properties at near ultraviolet wavelengths: Rare earth 4f. -->. 5d transitions in crystals and glasses: Progress report for the period June 1, 1987 to May 31, 1988
The project has considered several aspects of the optical properties of lanthanide (rare-earth) doped crystals and glasses at near ultraviolet wavelengths. Measurements of the optical gain and loss at 325 nm in Ce/sup 3 +/:LiYF/sub 4/ are presented. In addition to creating a cerium ion population inversion, the ultraviolet pumping forms transient and stable color centers via the excited cerium states. Crystals of Cr/sup 3 +/:GSGG show several sharp absorption lines in the 310 nm to 340 nm region which we have identified as transitions of the Gd/sup 3 +/ ion. Excitation spectra taken by monitoring the Cr/sup 3 +/ luminescence shows that a Gd/sup 3 +/ ..-->.. Cr/sup 3 +/ energy transfer process is active in this material. Measurements of the time dependance of the Cr/sup 3 +/ fluorescence following pulsed laser excitation of the Gd/sup 3 +/ ions indicates the characteristic time over which this energy transfer occurs. The 5d ..-->.. 4f transitions of cerium doped crystals are generally thought to have unity quantum efficiency of luminescence at room temperature. Measurements of the fluorescence lifetimes of the 5d ..-->.. 4f fluorescence transitions in Ce/sup 3 +/:CaF/sub 2/, Ce/sup 3 +/:LiYF/sub 4/, Ce/sup 3 +/:YAG, Ce/sup 3 +/:fluoroberyllate glass, and Ce/sup 3 +/:ZBLA glass at 300 K and 77K are presented. Progress in the construction of a high temperature oven with full optical access is also discussed. Cerium doped solids have the potential for laser action on the 5d ..-->.. 4f transitions. Such laser would be broadly tunable toward the near ultraviolet. Initial measurments of potential cerium doped glasses for such laser devices is dicussed. Progress has been made on the study of laser-induced grating formation in impurity doped solids. A multi-mode pulsed Nd:YAG laser has been used to write such transient gratings in Cr/sup 3 +/:Al/sub 2/O/sub 3/. Extensive repair of the excimer laser to be used for grating formation in the near ultraviolet is also described.
- Research Organization:
- Connecticut Univ., Storrs (USA)
- DOE Contract Number:
- FG02-84ER45056
- OSTI ID:
- 5481969
- Report Number(s):
- DOE/ER/45056-7; ON: DE88005403
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Energy transfer and non-linear optical properties at near ultraviolet wavelengths: Rare earth 4f yields 5d transitions in crystals and glasses
Energy transfer and non-linear optical properties at near ultraviolet wavelengths: Rare earth 4f yields 5d transitions in crystals and glasses
Related Subjects
DOPED MATERIALS
ENERGY TRANSFER
NONLINEAR OPTICS
LITHIUM FLUORIDES
SOLID STATE LASERS
YTTRIUM FLUORIDES
CERIUM IONS
COLOR CENTERS
EXPERIMENTAL DATA
GRATINGS
PROGRESS REPORT
ALKALI METAL COMPOUNDS
CHARGED PARTICLES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DOCUMENT TYPES
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
IONS
LASERS
LITHIUM COMPOUNDS
LITHIUM HALIDES
MATERIALS
NUMERICAL DATA
OPTICS
POINT DEFECTS
TRANSITION ELEMENT COMPOUNDS
VACANCIES
YTTRIUM COMPOUNDS
420300* - Engineering- Lasers- (-1989)