Correlation Spectroscopy with Noise Light Excitation

点击翻译按钮获取中文摘要

A high-resolution spectroscopy with noise light excitation is studied. This spectroscopy is based on broad-band excitation with noise light, wave-form correlation, and Fourier analysis.A noise-excitation spectroscopy in Rb atoms was examined to clarify the mechanism of the signal generation on the Fourier spectra obtained from the two types of correlation. The Zeeman signals of the ground and the excited states of the D_1 transition were observed on the Fourier spectra of the transmission and the emission wave forms, the signals obtained from auto-and cross-correlations were compared, and the line shapes of the observed signals were analyzed by using a linear response theory.The principle of the noise-excitation spectroscopy is derived from the theory of linear systems ; linear time-independent systems can be characterized by the response to a stochastic perturbation with a frequency-independent power spectrum, usually called white random noise. The characteristic of the noise-excitation spectroscopy is as follows. High resolution ; the frequency resolution is determined by the inverse of the measuring time and independent of the spectral width of the light source. High sensitivity ; the signal-to-noise ratio for sharp lines is large as compared with conventional frequency-sweep method. Spectra of absorption and dispersion types can be obtained at the same time. The effect of inhomogeneous broadening can be removed.