Precision measurements of the line profile by the diode laser spectroscopic method

Problems of the precision measurements of spectral line parameters by diode-laser spectroscopic methods were examined. The instrumental function of a diode laser spectrometer was investigated in detail. The knowledge of the latter makes it possible to solve correctly the problem of the 'optical zero' and to reconstruct the true line profile with an error less than 1%. The instrumental function of a diode laser spectrometer was determined for the example of a laser diode emitting radiation at the wavelength λ = 1.53 μm. The function represents the convolution of two Lorentzian functions with the characteristic half-widths Δν_l and Δg, which vary not only from mode to mode but also within the limits of a single radiation mode.