Sub-terahertz spectroscopic system using a continuous-wave broad-area laser diode and a spatial filter
Sub-terahertz spectroscopic system using a continuous-wave broad-area laser diode and a spatial filter
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使用连续波大面积激光二极管和空间滤波器的亚太赫兹光谱系统
DOI：
10.1063/1.3639296
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发表时间：
2011
影响因子：
3.2
通讯作者：
M. Hangyo
中科院分区：
文献类型：
--
作者：
O. Morikawa;M. Fujita;K. Takano;M. Hangyo
我们提出了一种类似于THz-TDS的低成本亚太赫兹光谱系统，在该系统中我们使用了连续波宽带激光二极管(BLD)。当BLD波束在自由空间中使用时，信号波形的傅里叶谱是离散的，并且在离散峰之间的频率处非常弱。为了使光谱适用于光谱，通过空间滤波(SF)使用BLD光束，结果是离散线之间的连续光谱分量的幅度显著增加。通过考虑SF对BLD光束方向图的过滤效应，解释了这种变化。此外，我们还表明，与我们以前的工作相比，使用SF后样品的透射谱的信号和信噪比都有所提高。
We have proposed a low-cost type spectroscopic system in the sub-THz region similar to the THz-TDS, in which we use a continuous-wave broad-area laser diode (BLD). The Fourier spectrum of the signal waveform is discrete and is very weak at frequencies between the discrete peaks when the BLD beam is used in free space. In order to make the spectrum suitable for spectroscopy, the BLD beam is used through a spatial filter (SF) and as a result, the amplitude of the continuous spectral components between the discrete lines increases considerably. This change is explained by considering the filtering effect of the beam patterns of the BLD by the SF. Further, we show that the signal and then the signal-to-noise ratio of the transmission spectra of a sample are enhanced by using the SF compared with our previous work.
影响因子：
4
作者：
Miyamaru, F;Hangyo, M
通讯作者：
Hangyo, M