Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
Volume 43, Issue 10B, Pages L1337-L1339Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.43.L1337
Keywords
upconversion; rare-earth ion-doped glass; random laser
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We demonstrated the upconversion lasing of a random medium composed of thulium-ion-doped fluorozirconate glass powders and submicrometer-sized titanium dioxide particles. Blue and red lasing emissions were induced by near-infrared excitation light via sequential multiphoton excitation, which enabled a highly efficient pumping of the gain particles within the random medium. The thresholds of the upconversion lasing were determined to be 2.6 and 6.3 kW/cm(2) in 800-nm and 450-nm wavelength regions, respectively.
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