Cr^{2+}：ZnSe飞秒laser在分子指纹2.4 $μ$ m区域的灵敏多重光谱
Sensitive multiplex spectroscopy in the molecular fingerprint 2.4 $μ$m region with a Cr^{2+}:ZnSe femtosecond laser
摘要：
超短脉冲Cr^{2+}：ZnSe激光器是一种新型宽带光源，可用于高灵敏度的分子光谱学研究。130 fs的脉冲可以覆盖2.4 $μ$ m附近高达380 cm^-1的谱域，傅里叶变换光谱仪同时以0.12 cm^-1（3.6 GHz）的分辨率对该谱域进行分析。乙炔和氨的光谱在13秒内记录下来，从70 cm长的吸收光谱（约为4150 cm^-1）得到，每个光谱元素平均1秒时的信噪比为3800，噪声等效吸收系数为2.4*10^-7 cm^-1*Hz^-1/2，表明HF分子的检测水平为0.2 ppbv。如果使用广泛使用的传统钨灯光源而不是激光光源，相同的光谱需要一个多小时。
英文摘要：
An ultrashort-pulse Cr^{2+}:ZnSe laser is a novel broadband source for sensitive high resolution molecular spectroscopy. A 130-fs pulse allows covering of up to 380 cm^-1 spectral domain around 2.4 $μ$m which is analyzed simultaneously with a 0.12 cm^-1 (3.6 GHz) resolution by a Fourier-transform spectrometer. Recorded in 13 s, from 70-cm length absorption around 4150 cm^-1, acetylene and ammonia spectra exhibit a 3800 signal-to-noise ratio and a 2.4*10^-7 cm^-1*Hz^-1/2 noise equivalent absorption coefficient at one second averaging per spectral element, suggesting a 0.2 ppbv detection level for HF molecule. With the widely practiced classical tungsten lamp source instead of the laser, identical spectra would have taken more than one hour.
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