Stable frequency laser radiation

 

Usage: in laser technology when creating stable frequency laser radiation, which, in turn, can be used in various industries for laser spectroscopy, Metrology, locations and other Technical result of the invention is to provide a stable laser frequency, which simultaneously provides both short-term and long-term stability of the frequency of radiation. The inventive stabilized by the emission frequency of the laser includes a reference optical quantum generator equipped with an absorber, each mirror of the resonator which is provided with petconnection, the discriminator frequency deviations in the form of an interferometer in which each mirror is equipped with petconnection, and containing a nonlinear absorber, saturating at a frequency referred to the reference quantum generator, and quantum amplifier, and an optical circuit resonators named reference quantum generator and the interferometer, the optical isolator, the first photodetector receiving the radiation of the interferometer, and the first tool-locked loop associated with the first photodetector, the second photodetector from the second photodetector and petconnection mirrors quantum oscillator, and the third tool-locked loop associated with the first photodetector and petconnection the cavity mirrors of the interferometer, while the first tool-locked loop associated with the second tool-locked loop. 1 C. p. F.-ly, 1 Il.

The invention relates to laser technology and can be used to create stable frequency laser radiation, which, in turn, can be used in various industries for laser spectroscopy, Metrology, locations, etc.

Known stable frequency laser radiation, containing the reference optical quantum generator, the output of which is placed the discriminator frequency deviations in the form of custom high-q of the interferometer cavity between the mirrors which is filled with a substance having nonlinear absorption on the frequency of the reference radiation, the optical circuit resonator reference oscillator and the interferometer, the optical isolator and the tool-locked loop. The frequency of the laser is stabilized by saturated absorption resonance arising in the field of standing waves in the interferometer [Daussy C., F. Ducos, Rovera G. D. and O. Acef, "Performances of OsO4 of the stability characteristics of such a laser is associated with an increase in the quality factor of the interferometer, which is provided by using a unique mirror with high reflection coefficients and very low losses on the scattering, absorption and so on, However, complicated the process of registration of optical resonances at the output of the interferometer and their use for stabilizing the laser frequency due to the reduction of their intensity, and increases the cost of the laser.

Also known stable frequency laser that contains the reference optical quantum generator, the discriminator frequency deviations as custom interferometer containing the cell with the environment, non-linear absorption at the frequency of the reference oscillator and optical quantum amplifier; an optical circuit cavities of the generator and the interferometer, the optical isolator, the photodetector and the tool-locked loop frequency [RF Patent 2073949, IPC H 01 S 3/13, B. I. 5, 20.02.97]. The presence of optical quantum amplifier inside the interferometer provides high quality latest, reduces demands on the quality of the mirrors forming the interferometer. This procedure increases the amplitude of the optical resonances at the output of the interferometer compared with the system described above, which gives potential oavramenko short-term and long-term stability of the frequency of radiation, because it only has one ring stabilization. This laser is most similar to the proposed laser characteristics is taken as a prototype of the invention.

The basis of the invention is the creation of stable laser frequency, which simultaneously provides both short-term and long-term stability of the frequency of radiation.

The problem is solved in that a stable frequency laser, comprising: a reference optical quantum generator, each mirror of the resonator which is provided with petconnection, and containing an intracavity absorption cell; the discriminator frequency deviations in the form of an interferometer in which each mirror is equipped with petconnection containing inside the absorbing cell, saturating at a frequency referred to the reference quantum generator, and quantum amplifier, and an optical circuit resonators named reference quantum generator and the interferometer; a first photodetector receiving the radiation of the interferometer, the first tool-locked loop frequency generator associated with the first photodetector, the second photodetector, receiving radiation reference Cheetara mirror quantum resonator reference oscillator; and the third tool-locked loop associated with the first photodetector and petconnection the cavity mirrors of the interferometer; the first tool-locked loop is also associated with the second tool-locked loop.

The proposed scheme of the laser shown in the drawing.

The device comprises a reference optical quantum generator 1, consisting of optical quantum amplifier 3 and cell 4 with the medium with nonlinear absorption at the frequency of the reference oscillator 1 and the mirrors 7 and 8 installed on piezosurgery, which are in the form of a piezoceramic packages; the discriminator frequency deviations 2 in the form of custom-type interferometers Fabry-Perot formed by the mirrors 9 and 10 mounted on piezosurgery, and containing the cell 5 with the environment, with nonlinear absorption at the frequency of the reference oscillator 1, and optical quantum amplifier 6; the second photodetector 11, associated with the second tool-locked loop 12; circuit 13 resonators oscillator 1 and the interferometer 2, consisting of mirrors 14, 15; optical isolator 16; the first photodetector 17 associated with the third and first means locked loop 18 and 19, respectively; and volumes of regulations, uses trial modulating signal and performs the standard, for example, as described in article Century, Goldort, A. E. Om "E-block system frequency stabilization of the laser." Instruments and experimental techniques, 3, 1980, S. 190-193.

The laser operates as follows.

Due to the saturation of the absorber 4 in the radiation power of the generator 1, falling on the second photodetector 11, resonance occurs saturated absorption. The second tool-locked loop 12 generates a test modulation signal and carries out the adjustment of the frequency of the reference quantum generator on the top of such a resonance. This is the standard method by filing the appropriate corrective voltage to piezoresistor mirror 8 to bring to minimum the first/third harmonic test modulation signal recorded on the second photodetector 11. The pressure absorber 4 and the operation mode of the reference quantum generator 1 are chosen in such a way as to ensure that the line width of its emission at the level of a few Hz or less. The width of the resonance absorption in this case may be of the order of 100 kHz. Further, the radiation reference quantum generator 1, having an optical circuit 13 falls into interferom the generator 1. From the interferometer radiation falls on the first photodetector 17, the signal from which is supplied to the third and the first locked loop means 18 and 19, respectively.

The role of the amplifier 6 in the interferometer 2 is reduced to compensate for the dissipative losses in the cavity of the interferometer in order to narrow its loop bandwidth, and thus to ensure the utmost quality. Third means locked loop 18 associated with the first photodetector 17, stabilizes the length of the interferometer so that the maximum bandwidth is always coincided with the emission frequency of the reference oscillator 1.

The pressure of the absorber 5, normally one to two orders of magnitude lower than the pressure of the absorber 4. In the corresponding number of times decreases the width of the resonance saturation absorption recorded in the radiation power at the exit of the interferometer and increases the accuracy of the adjustment of the frequency of radiation towards the center of the absorption line. The signal frequency offset of the reference oscillator 1 from the maximum of the resonance is logged on the first photodetector 17 and is supplied to the first tool-locked loop 19, which produces a corresponding correction voltage and shifts a "zero" synchronous det the tuning frequency of the reference oscillator 1 to the maximum narrower resonance saturated absorption in the interferometer.

The appropriate test modulation signal providing signal detuning frequency of the reference oscillator 1 relative to the center of the resonance absorption in the interferometer, this can either be supplied at additional amplitude or phase modulator, which can be installed in front of the interferometer, or directly on piezoresistor reference oscillator 1 in addition to the test modulation signal generated by the second means locked loop 12.

Semi-transparent mirror 20 is designed to output a stabilized radiation. To increase capacity and eliminate the modulation components of the output radiation, it is recommended to carry out his heterodyning.

Thus, a third means locked loop 18 stabilizes the length of the interferometer so that the emission frequency of the reference oscillator is always at the maximum loop bandwidth of the interferometer. The second tool-locked loop 12 stabilizes the frequency of the reference radiation quantum generator on the saturated absorption signal, which is formed in its inner absorptive cell, thereby providing a short-term frequency stability of the USA on the saturated absorption signal, formed in the absorber of the interferometer, thereby providing long-term stability of the radiation device.

Claims

Stable frequency radiation of the laser, including the reference quantum generator, each mirror of the resonator which is provided with petconnection, the discriminator frequency deviations in the form of an interferometer in which each mirror is equipped with petconnection, and containing a nonlinear absorber, saturating at a frequency referred to the reference quantum generator, and quantum amplifier, and an optical circuit resonators named reference quantum generator and the interferometer, the optical isolator, the first photodetector receiving the radiation of the interferometer, and the first tool-locked loop associated with the first photodetector, characterized in that it contains a second photodetector receiving the reference radiation quantum generator, and the second tool-locked loop associated with the second photodetector and petconnection mirrors quantum reference oscillator, and a third means locked loop associated with the first photodetector and petconnection mirror resonat the s frequency, and the reference quantum generator is equipped with a sink.

 

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