Authors

T. Danger; J. Koetke; R. Brede; E. Heumann; G. Huber;B. H. T. Chai

Comments

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Abbreviated Journal Title

J. Appl. Phys.

Keywords

EXCITED-STATE ABSORPTION; UP-CONVERSION LASER; FLUOROZIRCONATE FIBER; STIMULATED-EMISSION; BLUE; GENERATION; DIODES; YALO3; LIYF4; ER3+; Physics, Applied

Abstract

The spectroscopic parameters of Er3+-doped crystals were determined with regard to the upconversion laser parameters of the green transition S-4(3/2) -- > I-4(15/2), The influence of excited-state absorption on this laser channel was determined. Furthermore, upconversion pump mechanisms using ground-state and excited-state absorption around 810 and 970 nm were investigated by direct measurements of excited-state absorption. The spectroscopic results confirm the pulsed room-temperature laser experiments on the S-4(3/2) -- > I-5(5/2) transition. The lasers based on Er:LiYF4, Er:Y3Al5O12, and Er:Lu3Al5O12 were directly excited into the upper laser level by an excimer laser pumped dye laser in the blue spectral range. In Er:LiYF4, Er:KYF4, and Er:Y3Al5O12, laser action was achieved with two-step upconversion pumping by a Ti:sapphire laser and a krypton ion laser. In the case of the fluorides, the additional pumping with the krypton ion laser was not necessary. The laser emission wavelengths were 551 nm for Er:LiYF4, 561 nm for Er:Y3Al5012 and Er:Lu3Al5O12, and 562 nm for Er:KYF4. In addition, green quasi-cw laser emission of Er:LiYF4 pumped with an argon-ion laser was realized at room temperature.

Journal Title

Journal of Applied Physics

Volume

76

Issue/Number

3

Publication Date

1-1-1994

Document Type

Article

Language

English

First Page

1413

Last Page

1422

WOS Identifier

WOS:A1994PA30500005

ISSN

0021-8979

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