Open AccessEffects of pumping wavelength and pump density on the random laser performance of stoichiometric Nd crystal powders
Author(s) -
J. Azkargorta,
I. Iparraguirre,
Marco Bettinelli,
Enrico Cavalli,
Macarena Barredo-Zuriarrain,
Sara Garcı́a-Revilla,
Rolindes Balda,
J. Fernández
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.027365
Subject(s) - materials science , optics , slope efficiency , wavelength , laser , laser pumping , stoichiometry , beam (structure) , crystal (programming language) , optical pumping , random laser , optoelectronics , fiber laser , physics , chemistry , organic chemistry , computer science , programming language , lasing threshold
Laser slope and threshold properties have been investigated in Nd stoichiometric crystal powders as a function of pump wavelength and pump beam size. Above a given pumped area, the laser slope and the threshold pump energy per unit area are invariant and the known theoretical expressions are well fulfilled. Likewise, the size of the stimulated emission zone as a function of the pump beam area has been measured, also showing a different behavior above or below a given pumped area value which coincides with the one mentioned above. In conclusion, two different operating regimes with different performances are clearly observed as a function of the pump beam area.