A.L. Moura
Random lasing in Nd3+ doped potassium gadolinium tungstate crystal powder
Moura, A.L.; Fewo, S.I.; Carvalho, M.T.; Kuzmin, A.N.; Prasad, P.N.; Gomes, A.S.L.; de Araújo, C.B.
Authors
S.I. Fewo
M.T. Carvalho
A.N. Kuzmin
P.N. Prasad
A.S.L. Gomes
C.B. de Araújo
Abstract
Random laser (RL) emission in Nd 3+ doped potassium gadolinium tungstate—KGd(WO4)2 :Nd 3+—crystal powder is demonstrated. The powder was excited at 813 nm in resonance with the Nd 3+ transition 4I9/2→4F5/2. RL emission at 1067 nm due to the 4F3/2→4I11/2 transition was observed and characterized. An intensity threshold dependent on the laser spot area and bandwidth narrowing from ≈2.20 nm to ≈0.40 nm were observed and measured. For a beam spot area of 0.4 mm2, a RL threshold of 6.5 mJ/mm2 (90 MW/cm2) was determined. For excitation intensity smaller than the RL threshold, only spontaneous emission from level 4F3/2 with decay time in the tens microsecond range was observed, but for excitation above the RL threshold, significant shortening of excited level lifetime, characteristic of a stimulated process was found. The overall characteristics measured show that KGd(WO4)2 :Nd 3+ is an efficient material for operation of solid state RLs in the near-infrared.
Citation
Moura, A., Fewo, S., Carvalho, M., Kuzmin, A., Prasad, P., Gomes, A., & de Araújo, C. (2015). Random lasing in Nd3+ doped potassium gadolinium tungstate crystal powder. Journal of Applied Physics, 117(8), Article 083102. https://doi.org/10.1063/1.4913390
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 11, 2015 |
Publication Date | Feb 28, 2015 |
Deposit Date | May 14, 2015 |
Publicly Available Date | May 21, 2015 |
Journal | Journal of Applied Physics |
Print ISSN | 0021-8979 |
Electronic ISSN | 1089-7550 |
Publisher | American Institute of Physics |
Peer Reviewed | Peer Reviewed |
Volume | 117 |
Issue | 8 |
Article Number | 083102 |
DOI | https://doi.org/10.1063/1.4913390 |
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Copyright Statement
© 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics, 117, 083102 (2015) and may be found at http://dx.doi.org/10.1063/1.4913390.
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