Four-Photon Process Induced Upconversion Lasing

Chin. Phys. Lett.

2005, Vol. 22

Issue (5): 1152-1154 DOI:

Original Articles

Four-Photon Process Induced Upconversion Lasing

FAN Hai-Hua¹;WANG He-Zhou¹;TIAN Yu-Peng²

¹State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou 510275 ²Department of Chemistry, Anhui University, Hefei 230039

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FAN Hai-Hua, WANG He-Zhou, TIAN Yu-Peng 2005 Chin. Phys. Lett. 22 1152-1154

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Abstract It is measured that upconversion fluorescent intensity of a new molecule is proportional to the quartic of excitation density. This demonstrates that it is a four-photon absorption process. Furthermore, at high-density ultrashort pulse laser pumping, an emission appears to satisfy four criteria of lasing, including the highly directional emission, the short emission duration, the spectral narrowing, and changing to linear output/input relationship above a threshold. The experimental results demonstrate that the four-photon-process-induced amplified spontaneous emission occurs.

Keywords: 42.65.Ky

Published: 01 May 2005

PACS:

42.65.Ky

(Frequency conversion; harmonic generation, including higher-order harmonic generation)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2005/V22/I5/01152

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