Translation of "Parametric oscillator" in German

The frequency tripling is accomplished with the aid of an optical parametric oscillator (OPO).

The apparatus 1 may in particular be an optically parametric oscillator OPO.

A possible implementation for this purpose is the optical parametric oscillator (OPO).

This can be an optical parametric oscillator.

The spectrum shown was created with a periodically polarized lithium niobate crystal in an optical parametric oscillator.

Graham attended the Karls-Gymnasium in Stuttgart and studied at the University of Stuttgart, where in 1967 he earned under Hermann Haken his physics Diplom (quantum fluctuations of the optical parametric oscillator) and in 1969 his PhD (light propagation in laser-active fluctuating media).

In another preferred further development of the invention, the selection of the material for the medium and the positioning of the medium and mirrors for the phase-matched coupling in of the exciting laser beam and emitted laser beam are effected so as to result in the design of an optical parametric oscillator.

This is advantageous because the crystal direction need not be precisely maintained in an optical parametric oscillator when the wavelengths are readjusted by adjusting the temperature.

An optical parametric oscillator, hereinafter referred to as OPO, as is known, for example, from DE 42 19 169 A1, is used, above all, for this purpose.

Graham attended the Karls-Gymnasium in Stuttgart and studied at the University of Stuttgart, where in 1967 he earned under Hermann Haken his physics Diplom (quantum fluctuations of the optical parametric oscillator) and in 1969 his PhD (Lichtausbreitung in laseraktiven fluktuierenden Medien, "Light Propagation in Laser-active Fluctuating Media").

By means of a titanium-sapphire (TiSa) laser for stimulated deenergization of the fluorescent dye, and of an optical parametric oscillator (OPO), pumped by the TiSa, for exciting the fluorescent dye (Proc.

Leica Microsystems has effectively matched the Leica TCSSP5MP multiphoton microscope with a fully integrated OPO (optical parametric oscillator) system.

Operating wavelengths from the wavelength region between 1.1 ?m and 9.2 ?m, in particular from the lower part of this spectral region up to at most, for example, 5000 nm (5 ?m) can be achieved by way of example by the use of a solid state laser emitting in this spectral region, or by varying the wavelength of a seed laser, emitting at a certain wavelength, by means of an optical parametric amplifier (OPA) or by the use of an optical parametric oscillator (OPO).

In comparison with that state of the art therefore the object of the present invention is to provide a device for generating and detecting electromagnetic radiation in the THz frequency range, wherein an optically parametric oscillator is used for generating the THz radiation and the detector permits operation at ambient temperature under everyday conditions.

In that case an optically parametric oscillator in accordance with the present invention has a polar non-linearly optical crystal for example of lithium niobate (LiNbO 3), lithium tantalate (LiTaO 3) or gallium phosphite (GaP).

In that respect in an embodiment of the invention it is necessary for the THz wave generated by the parametric oscillator in the non-linearly optical crystal to be coupled out of the crystal in some way as the refractive indices of the materials typically used for the crystal are sufficiently great to cause internal total reflection in the crystal-generated THz wave.

In a further alternative embodiment of the invention the non-linearly optical crystal of the optically parametric oscillator is illuminated in addition to the pump radiation with a so-called seed radiation.

By virtue of the identical formation process in the non-linearly optical crystal of the optically parametric oscillator intensity modulation of the beat signal and the electromagnetic THz radiation are coupled together in phase-locked relationship.

In that way a part of the pump radiation can be branched off for driving the coherent phase-sensitive detector before the pump radiation passes into the optically parametric oscillator.

That electromagnetic radiation at the second frequency serves as so-called seed radiation for the optically parametric oscillator and permits spectral limitation of the emitted THz radiation and an increase in the intensity of the radiated THz radiation and also permits simpler tuning of the radiated THz frequency.

To tune the wavelength, the optically parametric oscillator 2 is arranged rotatably for that purpose so that it is possible to alter the angle of incidence of the pump radiation 12 .

As such tuning of the generated THz radiation also alters the beam path of the THz wave 8 radiated by the optically parametric oscillator, the detector must be correspondingly altered in its position, which makes an optical-fibre coupling of the reference signal to the detector 3 desirable.