Increase of the stimulated Raman scattering threshold at droplets by spectral broadening of nanosecond laser pulses
Increase of the stimulated Raman scattering threshold at droplets by spectral broadening of nanosecond laser pulses
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通过纳秒激光脉冲的光谱展宽增加液滴处的受激拉曼散射阈值
DOI：
10.1002/jrs.4106
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发表时间：
2012
影响因子：
2.5
通讯作者：
A. Leipertz
中科院分区：
文献类型：
--
作者：
Hankel;A. Braeuer;A. Leipertz
结果表明，单个微滴的受激拉曼散射(SRS)阈值随着脉冲激发激光辐射带宽的增加而增大。实验研究了两种液滴尺寸和两种激发带宽下的受激喇曼散射阈值。窄带激发采用中心波长为532 nm、半高带宽为0.05 nm、重复频率为10 Hz的倍频激光器。为了与宽带激发进行比较，采用了中心波长为566 nm、半高宽带宽为4 nm的含罗丹明6G的染料腔。直径分别为89和116微米的液滴用垂直光片照射。如果采用宽带激发而不是窄带激发--对于两种液滴尺寸--在达到SRS阈值之前，脉冲激发能量可以增加大约5倍。EMCCD探测器的乘法寄存器用于检测低信号。对探测器的增益因子进行了标定，使其适应不同的激发能量和信号强度。版权所有©2012 John Wiley&Sons，Ltd.
We show that the threshold of stimulated Raman scattering (SRS) from single micro‐droplets increases with the bandwidth of the pulsed excitation laser radiation. SRS thresholds were experimentally investigated for two droplet sizes and two excitation bandwidths. For the narrowband excitation, a frequency doubled Nd:YAG laser with a central wavelength of 532 nm, a full width half maximum (FWHM) bandwidth of 0.05 nm and a repetition rate of 10 Hz was used. For the comparison with the broadband excitation, a dye resonator containing Rhodamine 6G being pumped by the Nd:YAG laser was utilized with a central wavelength of 566 nm and a FWHM bandwidth of 4 nm. Droplets of 89 and 116 µm diameters, respectively, were illuminated by a vertical light sheet. If the broadband excitation is applied instead of the narrowband excitation ‐ for both droplet sizes ‐ the pulsed excitation energies can be increased by a factor of approximately 5 before the SRS threshold is reached. The multiplication register of an emCCD detector was used to detect low signals. The gain factor of the detector was calibrated and adapted to different excitation energies and signal intensities. Copyright © 2012 John Wiley & Sons, Ltd.
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