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Random lasing in Nd3+ doped potassium gadolinium tungstate crystal powder.
- Source :
-
Journal of Applied Physics . 2015, Vol. 117 Issue 8, p083102-1-083102-3. 3p. 1 Diagram, 4 Graphs. - Publication Year :
- 2015
-
Abstract
- Random laser (RL) emission in Nd3+ doped potassium gadolinium tungstate-KGd(WO4)2:Nd3+- crystal powder is demonstrated. The powder was excited at 813nm in resonance with the Nd3+ 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 0.4mm2, a RL threshold of 6.5 mJ/mm2 (90MW/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:Nd3+ is an efficient material for operation of solid state RLs in the nearinfrared. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LASERS
*POTASSIUM
*GADOLINIUM
*CRYSTAL structure
*EMISSION spectroscopy
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 117
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 101366457
- Full Text :
- https://doi.org/10.1063/1.4913390