Abstract: The invention relates to a method for generating coherent-phase light having a predefinable frequency value (?Soll), comprising the steps of generating working light with a working frequency (?SL), generating a frequency comb (10), which is a light field that consists of equidistant coherent-phase spectral lines, selecting a comb line (having the index m) from the frequency comb (10) having a frequency (?m), generating a frequency shift (??) of the frequency comb (10) and/or the working frequency (?SL) by means of time-dependent phase settings (?S(t)) modulo a multiple of 2?, in particular of 2?, and phase-coupling the possibly frequency-shifted fields of the working light (?SL) and the one possibly frequency-shifted frequency comb line (?m), so that the frequencies thereof are rigidly phase-coupled via the frequency shift (??), and working light having the desired frequency (?Soll) is obtained.

Abstract: The invention relates to a method for generating coherent-phase light having a predefinable frequency value (?Soll), comprising the steps of generating working light with a working frequency (?SL), generating a frequency comb (10), which is a light field that consists of equidistant coherent-phase spectral lines, selecting a comb line (having the index m) from the frequency comb (10) having a frequency (?m), generating a frequency shift (??) of the frequency comb (10) and/or the working frequency (?SL) by means of time-dependent phase settings (?S(t)) modulo a multiple of 2?, in particular of 2?, and phase-coupling the possibly frequency-shifted fields of the working light (?SL) and the one possibly frequency-shifted frequency comb line (?m), so that the frequencies thereof are rigidly phase-coupled via the frequency shift (??), and working light having the desired frequency (?Soll) is obtained.

Abstract: A modulator (2) is provided for the periodic frequency modulation of laser light. Disposed downstream of a photo detector means (13, 14) is an electronic signal processing means (15, 18, 20, 20', 21, 21', 22, 26, 27) for detecting and evaluating the amplitude modulation of electric signals caused by frequency modulation of the laser light.

Abstract: The device described for the measurement, without physical contact, of the speed, displacement distance and/or range of a reflecting object has a laser diode as light source, transmission and receiver optics for aiming the laser light from the laser diode at the object and for feeding part of the laser light reflected by the object back to the laser resonator, and a detector unit for detecting and analyzing the laser light emitted by the laser diode. Fitted to determine the modulation frequency of the laser light, which is frequency-modulated as a function of the feedback to the laser resonator, is a frequency discriminator, a photodiode and a processing circuit with a spectrum analyzer.