Picosecond-time-resolved studies of nonradiative relaxation in ruby and alexandrite
Dynamics of the nonradiative transitions between the /sup 4/T/sub 2/ pump band and the /sup 2/E storage level of the Cr/sup 3 +/ ion in ruby and alexandrite crystals is studied using the picosecond excite-and-probe absorption technique. A 527-nm picosecond pulse excites the /sup 4/T/sub 2/ state of the Cr/sup 3 +/ ion, and an infrared picosecond probe pulse monitors the subsequent growth and decay of population in the excited states as a function of pump-probe delay. An upper limit of 7 ps is determined for the nonradiative lifetime of the /sup 4/T/sub 2/ state in ruby. A vibrational relaxation time of 25 ps for the /sup 4/T/sub 2/ band in alexandrite is estimated. The time to attain thermal equilibrium population between the /sup 2/E and /sup 4/T/sub 2/ levels of alexandrite following excitation of /sup 4/T/sub 2/ band is estimated to be approx. 100 ps.
- Research Organization:
- City Coll., New York (USA). Inst. for Ultrafast Spectroscopy and Lasers
- OSTI ID:
- 6651955
- Report Number(s):
- AD-A-176562/7/XAB
- Resource Relation:
- Other Information: Pub. in Advances in Laser Science, No. 1, 206-211(1985)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LASER MATERIALS
RELAXATION TIME
BERYL
CHROMIUM
CRYSTALS
DECAY
DYNAMICS
HEAT
IONS
MONITORS
PROBES
PULSES
RELAXATION
RUBY
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BERYLLIUM COMPOUNDS
BERYLLIUM SILICATES
CHALCOGENIDES
CHARGED PARTICLES
CORUNDUM
ELEMENTS
ENERGY
MATERIALS
MEASURING INSTRUMENTS
MECHANICS
METALS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENTS
420300* - Engineering- Lasers- (-1989)