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Wavelength- and amplitude-modulated photoacoustics: comparison of simulated and measured spectra of higher harmonics

机译：波长和振幅调制的光声：比较高次谐波的模拟光谱和实测光谱

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摘要

Photoacoustic (PA) spectra generated by current modulation of a distributed feedback diode laser (DFB-DL) were measured for the ammonia absorption line at 1.53 (mu)m and calculated using absorption spectra taken from a database. The algorithm is based on a combined amplitude- and wavelength-modulation (AM-WM) scheme. The spectral characteristics of the DFB-DL were determined by comparing simulated spectra with Fourier transform infrared measurements. PA spectra were measured and simulated from the first to fourth harmonic and a variation of the modulation depth with modulation frequency was observed. It was found that combined AM-WM modulation may produce larger PA signals than separate AM or WM detection for the first harmonic.
机译：在1.53μm处测量通过氨反馈谱线通过分布式反馈二极管激光器（DFB-DL）的电流调制产生的光声（PA）光谱，并使用从数据库中获取的吸收光谱进行计算。该算法基于组合的振幅和波长调制（AM-WM）方案。 DFB-DL的光谱特性是通过将模拟光谱与傅立叶变换红外测量结果进行比较来确定的。从一阶到四阶谐波对PA谱进行测量和模拟，观察到调制深度随调制频率的变化。已经发现，与针对一次谐波的单独AM或WM检测相比，组合的AM-WM调制可产生更大的PA信号。

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