Two-photon-pumped cavity lasing in a dye-solution-filled hollow-fiber system.
Two-photon-pumped cavity lasing in a dye-solution-filled hollow-fiber system.
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DOI：
10.1364/ol.20.002393
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发表时间：
1995-12
期刊：
影响因子：
3.6
通讯作者：
G. He;J. Bhawalkar;C. Zhao;C. Park;P. Prasad
中科院分区：
文献类型：
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作者：
G. He;J. Bhawalkar;C. Zhao;C. Park;P. Prasad
双光子泵浦腔激光已经在染料溶液填充的中空光纤配置中实现，该配置提供了更长的增益长度和更高的局部泵浦强度。增益介质为新染料4-[N-（2-羟乙基）-N-（甲基）氨基苯基]-4 ' -（6-羟基己基磺酰基）二苯乙烯在二甲亚砜中的溶液，在近红外辐射激发下表现出强烈的双光子吸收诱导荧光。当系统被800 nm的5-ns激光脉冲泵浦时，可以观察到频率上转换的腔激光，峰值激光波长在565 nm附近，脉冲持续时间为2 - 3.5 ns。采用中空光纤几何结构的主要优点之一是双光子泵浦阈值较低，对于内径为100 μm、长度为15 cm的中空光纤样品，双光子泵浦阈值可低至20-30 μJ。从吸收的泵浦能量到上转换激光输出的转换效率为2.3%。
Two-photon-pumped cavity lasing has been achieved in a dye-solution-filled hollow-fiber configuration that provides both a longer gain length and a higher local pump intensity. The gain medium is a solution of the new dye 4-[N-(2-hydroxyethyl)-N-(methyl)amino phenyl]-4′-(6-hydroxyhexyl sulfonyl)stilbene in dimethyl sulfoxide, which shows a strong two-photon-absorption-induced fluorescence when excited with near-infrared radiation. When the system is pumped with 800-nm 5-ns laser pulses, frequency-upconverted cavity lasing can be observed with a peak lasing wavelength near 565 nm and a 2–3.5-ns pulse duration. One of the major advantages of using a hollow-fiber geometry is the low two-photon pump threshold, which was measured to be as low as 20–30 μJ for a 15-cm-long hollow-fiber sample of 100-μm internal diameter. The conversion efficiency from the absorbed pump energy to the upconverted lasing output was 2.3%.