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Role of noise in the diode-laser spectroscopy of the spectral line profile

机译:噪声在光谱线轮廓的二极管激光光谱中的作用

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Questions concerning precise measurements of the spectral-line-profile parameters by diode-laser spectroscopic methods were examined. The instrumental function of a distributed-feedback diode laser (λ=1.53μm), consisting of the additive contributions of the noise due to sontaneous emission, frequency flucturations, and intensity flucturations was investigated. An analytical formula was obtained for the spectrum of the diode-laser field formed by frequency flucturations. The spectral density go of the frequency fluctuations, determining the width of the central part of the emission line profile of a diode laser, was found by two independent methods (by fitting to a Doppler-broadened absorption line profile and by finding the intensity of the residual radiation and the saturated-absorption line with). The parameters Ω and Γ of the spectral density of the frequency fluctuations, coupled to the relaxation oscillations and determining the wing of the diode-laser emission line profile, were determined experimentally. By taking into account the instrumental function of the diode laser, involving successive convolution with the recorded emission spectra, it was possible to reproduce correctly the spectral line profile and to solve accurately the problem of the `optical zero'. The role of the correlation between the intensity noise and the diode-laser frequency was considered.
机译:研究了有关通过二极管激光光谱法精确测量光谱线轮廓参数的问题。研究了分布式反馈二极管激光器(λ=1.53μm)的仪器功能,该功能由声发射,频率波动和强度波动引起的噪声相加。获得了由频率波动形成的二极管激光场的频谱的解析公式。通过两种独立的方法(通过拟合多普勒展宽的吸收线分布图并通过找到强度的强度)来确定频率波动的频谱密度,从而确定二极管激光器发射线分布图的中心部分的宽度。剩余辐射线与饱和吸收线配合使用)。通过实验确定了频率波动的频谱密度的参数Ω和Γ,耦合到弛豫振荡并确定了二极管-激光发射线轮廓的机翼。通过考虑二极管激光器的仪器功能,包括与记录的发射光谱的连续卷积,可以正确地再现光谱线轮廓并精确地解决“光学零”的问题。考虑了强度噪声和二极管激光频率之间的相关性。

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