典型文献
Two-photon absorption and stimulated emission in poly-crystalline Zinc Selenide with femtosecond laser excitation
文献摘要：
The optical nonlinearity in polycrystalline zinc selenide (ZnSe), excited with 775 nm, 1 kHz femtosecond laser pulses was investigated via the nonlinear transmission with material thickness and the Z scan technique. The measured two photon absorption coefficient β was intensity dependent, inferring that reverse saturated absorption (RSA) is also relevant dur-ing high intensity excitation in ZnSe. At low peak intensity I < 5 GW cm–2, we find β = 3.5 cm GW–1 at 775 nm. The spec-tral properties of the broad blueish two-photon induced fluorescence (460 nm-500 nm) was studied, displaying self-ab-sorption near the band edge while the upper state lifetime was measured to be τe ～ 3.3 ns. Stimulated emission was ob-served when pumping a 0.5 mm thick polycrystalline ZnSe sample within an optical cavity, confirmed by significant line narrowing from Δλ = 11 nm (cavity blocked) to Δλ = 2.8 nm at peak wavelength λp = 475 nm while the upper state life-time also decreased. These results suggest that with more optimum pumping conditions and crystal cooling, polycrystal-line ZnSe might reach lasing threshold via two-photon pumping at λ = 775 nm.
文献关键词：
中图分类号：
作者姓名：
Qianliang Li;Walter Perrie;Zhaoqing Li;Stuart P Edwardson;Geoff Dearden
作者机构：
Laser Engineering Group,School of Engineering,University of Liverpool,Liverpool,L693GQ,United Kingdom;Laser Processing Research Centre,School of Mechanical,Aerospace and Civil Engineering,University of Manchester,Manchester M139PL,United Kingdom
文献出处：
引用格式：
[1]Qianliang Li;Walter Perrie;Zhaoqing Li;Stuart P Edwardson;Geoff Dearden-.Two-photon absorption and stimulated emission in poly-crystalline Zinc Selenide with femtosecond laser excitation)[J].光电进展（英文版）,2022(01):1-12
A类：
Selenide,blueish
B类：
Two,photon,absorption,stimulated,emission,Zinc,femtosecond,laser,excitation,optical,nonlinearity,polycrystalline,zinc,selenide,ZnSe,excited,kHz,pulses,was,investigated,via,transmission,material,thickness,scan,technique,measured,two,coefficient,intensity,dependent,inferring,that,reverse,saturated,RSA,also,relevant,dur,high,At,low,peak,GW,we,find,spec,tral,properties,broad,induced,fluorescence,studied,displaying,self,band,edge,while,upper,state,lifetime,be,Stimulated,ob,served,when,pumping,sample,within,cavity,confirmed,by,significant,narrowing,from,blocked,wavelength,decreased,These,results,suggest,more,optimum,conditions,cooling,might,reach,lasing,threshold
AB值：
0.554591
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