Patent ID: 7119324

Claim:
A highly stable broadband light source, comprising: a semiconductor light source with a specific emission spectrum; a number of optical filters having specific bandpass filtering functions and predetermined bandwidths; a coupling element, to which the light emissions of the semiconductor light source and of the optical filters are fed and at the output of which the light emission of the broadband light source is effected, the spectrum of the light emission of the broadband light source being composed of the emission spectrum of the semiconductor light source and the bandpass filtering function of the number of optical filters; and the wavelengths of the number of optical filters being stabilized in such a way that the spectrum of the light emission of the broadband light source is essentially determined only by the filtering functions of the number of optical filters characterized in that the number of optical filters is two, and two photodetectors are provided, one of which in each case is assigned to each optical filter and detects the spectrum transmitted by the assigned optical filter and feeds it to a divider, in which the detected spectra are compared.