Creation of F.sub.2.sup.+ color centers

Details Creation of F.sub.2.sup.+ color centers Creation of F.sub.2.sup.+ color centers

1978-05-23

1980-01-15

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

204DIG11, 331 945F, B01J 110

Patent

active

041837959

ABSTRACT:
Production of F.sub.2.sup.+ color centers in alkali halide crystals with densities high enough for efficient use in lasers is achieved by a two-step, highly selective photoionization mechanism. This mechanism is coupled with the use of suitable divalent metal ions as efficient and stable electron traps to allow nearly 100 percent conversion of F.sub.2 color centers to F.sub.2.sup.+ color centers. The two-step photoionization mechanism comprises photo-exciting the F.sub.2 color center to the first bound state, which requires lower energy than the corresponding transition for F color centers, then photoionizing the F.sub.2 color center from the first bound state, and finally, capturing the electron thus liberated on the divalent metal ions.

REFERENCES:
patent: 3970960 (1976-07-01), Mollenauer

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