SU392871A1 - Optical quantum generator - Google Patents

Description

one

The invention relates to the field of quantum electronics and can be used to create optical quantum generators (laser) with the stabilization of the output radiation power.

A known laser with output power stabilization, in particular, having an active power stabilization system consisting of a photodetector, a reference voltage source and a control amplifier, the output of the control amplifier connected to an adjustable discharge tube power source. This laser uses its dependence on the excitation current of the output to control the output power.

Such laser systems do not provide sufficient stability of the radiation power.

The aim of the invention is to increase the stability of the radiation power of a laser with arbitrary active elements.

The goal is achieved by the fact that a transparent plate is installed perpendicular to its axis inside the laser cavity, one side of which is coated, and the other has a reflective or scattering coating. The plate is fixed on nioceramic connected to the output of the control element of the active radiation power stabilization system.

FIG. 1 shows the block diagram of the proposed JAG; in fig. 2 is a graph of its radiation power versus the location of the coating.

The proposed JAG contains resonator mirrors 1, 2; active element 3; pumping circuit 4; transparent plate 5, side A of which is coated, and side B is coated with a film coating that absorbs or scatters radiation; photodetector 6; reference voltage source 7; control amplifier 8; piezo ceramics 9.

If the film absorbing or scattering radiation is located in the electric field node of a standing wave of any type of resonator oscillations, then it introduces minimal losses into it. When the film is displaced from this position, the losses grow and the quality factor of this type of oscillation decreases. Near

mirrors nodal surfaces of different types of vibrations are close to one another. Therefore, if the film is located at a distance of 1-3 mm from the mirror, regardless of the number of types of oscillations excited in the resonator, the dependence of the radiation power on the position of the film has the form shown in FIG. 2. If this distance is more than 3 mm, then the same film can be used to select the types of resonator oscillations, and the nature of the power dependence

radiation in single-frequency generation mode is similar to that shown in FIG. 2

In the initial state, the film is installed in such a way that it introduces some (not minimal) film. At the same time, the radiation power of the RO is not maximum. This power value corresponds to the distance / o between coating B and mirror 2 (Fig. 2).

The voltage from the output of the photodetector 6 is fed to the input of the control amplifier 8. The same input is supplied from the voltage source 7 of the reference voltage, and it is set so that the output voltage of the control amplifier is zero. When the radiation power changes due to changes in the pumping parameters, resonator misalignment, etc., the voltage at the output of the photodetector changes, and the control voltage appears at the output of the control amplifier to the piezoelectric ceramics. In this case, the film is shifted, and the losses introduced by it are changed in such a way that the radiation power returns to its initial value.

Subject invention

An optical quantum generator containing a resonator and an active radiation power stabilization system, characterized in that, in order to increase the stability of the radiation power of an optical quantum generator with an arbitrary active element, a transparent plate is installed perpendicular to its axis, the transparent side of which is transparent the other is applied a reflective or diffusing coating, the plate is fixed on piezoceramic connected to the output of the control element of the active stabilization system transmit power.