SU1487770A1 - Stabilized laser - Google Patents

Abstract

This invention relates to quantum electronics and can be used to stabilize the frequency of a laser. The aim of the invention in nstfiTCH is improving the reliability as well as the frequency stability and the speed of controlling the frequency hold band. Stabilized laser, optically coupled active element, cell absorbing, mirrors placed on piezoelements, photodetector, preamplifier and selective amplifier with synchronous detector, reference generator, filter, direct current amplifier (DCA), switch, sawtooth generator and a thermal sensor with a thermocouple associated with a temperature stabilizer is equipped with a comparator-distributor, an inverter, an integrator, a transmitter 1-1 connected in series to the filter output, and the sum torus In this case, the distributor, inverter, integrator, switch, and adders form a device for expansion of the frequency hold bands. The latter may also consist of a distributor, a sampling and storage device, an adder, a customer and an end adder. 2 ZP .., 2 ill. oa

Description

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This invention relates to quantum electronics and can be used to stabilize the radiation frequency of absorbing cell lasers.

The aim of the invention is to increase the reliability and stability of the frequency, as well as to increase the speed of control of the frequency holding band.

Figures 1 and 2 show embodiments of a stabilized, laser,

The stabilized laser (Fig. 1) consists of optically coupled active element 1, absorbing cells 2 located in a resonator formed by mirrors 3 and 4 placed. on the piezoelectric elements 5 and 5, and the fiber receiver 7, electrically connected to the preamplifier 8, the selective amplifier 9, the reference generator 10, the synchronous detector 1i, whose input is connected to the reference generator 10, and the output to the filter 12 connected to the amplifier direct current (UFD) 13. UFT 13 output is electrically connected to piezoelectric element 6. Azer also contains a saw-tooth voltage generator (GUI) 14, a transponder 15. Fil.tr 12 through a series-connected comparator-distributor 16, an inverter 17, integrator 18, switch 19 is connected to one it from the inputs of the adder 20, the other input of which is connected to the FPG 14, and the output to the switch

15. GPN 14 is also connected to one of the inputs of the comparator-distributor.

16, the scion of the absorbing cell 2 fits snugly to block 21 (thermo sensor with thermopile) connected to temperature stabilizer 22.

The comparator distributor, inverter-top, integrator, switch and sum-op form a device for expanding and holding the frequency band.

The stabilized laser works in the following way.

The radiation in the resonator, provided by the active element 1, saturates the absorption in cell 2 with iodine. As a result, peaks are formed on the power circuit, which are the reference points for the automatic frequency control system (AGI). The radiation through the mirrors 3 and 4, fixed on the piezoelectric elements 5 and 6, is not output to the photodetector 7, is amplified by the preamplifier 8. and the selective amplifier 9 From the reference oscillator 10, the signal is fed to a piezoelectric element nt 5, which provides a deviation of the laser frequency, and to a synchronous detector 11, to the second input of which a signal is fed from amplifier 9. A signal 12 passes through the output of the synchro detector 11.

The stabilized laser can operate in two modes. Switching them is done by a switch

15. In addition, the stabilized laser operates in frequency stabilization mode for a group of peaks. The signal from the synchronous detector 1 through the filter 12 does not fall on. UPT 13 through switch 15, since the latter switches to the right position. The signal from the synchronous detector 11 lepes The filter 12 is fed to the comparator-distributor

16, where it is compared to a signal

GPN 14. In this case, the comparator misses on its output only for example. polishing polichnosti. The part of the peaks corresponding to the negative part of the sawtooth voltage is distributed to the upper channel, and the part of the peaks corresponding to the positive part of the sawtooth voltage is distributed to the lower channel in which the inverter 17 is located, and the signals of both channels are added to the integrator 18 and after integration via switch 19, which is turned off in the other two

5 presses, the adder 20 and the switch 15 is supplied to the UFD 13 and the piezoelectric element 6,

When the peaks are symmetrically positioned relative to the zero of the sawtooth voltage, the output voltage of the integrator of 19 is zero, which corresponds to frequency stabilization at the center of the severity of the peak group, Prc deviation of the center of the severity of the severity of the voltage at the integrator output I 9 is nonzero and controls the length of the piezocorrector 6, returning the laser frequency to the center of gravity of the peak group.

0 The stabilized laser (Fig. 2) consists of an optically coupled active element 23, an absorbing cell 24 located in a resonator formed by mirrors 25 and 26, 5 times spaced on piezoelectric elements 27 and 28 and a photodetector 29 electrically connected through preamplifier 30 and selective amplifier 31 with synchronous detector 32, another input

0 which is connected with the reference oscillator 33 of the automatic frequency control system (AFC) and the output is connected to the filter 34 connected to the DC control 35 via switch 36. The DC output 35

5 is electrically connected to the piezoelectric transducer 6. The filter 34 through a serially connected driver 37, a valve 38, a sampling and storage device (VHF) 39, an adder 40,

Q switch 41. Scion absorbing-. 24, it fits snugly to block 42 (thermal sensor :: with thermopile), connected to temperature stabilizer 43, connected to switch 41

5 adder 44, To another input of the end adder 44 is connected GPN 45.. The output of the end adder 44 is connected to the switch 36, GPN 45 soy-also With a gate input

the distributor 38 and the information input of the water economy department 39.

A device for expanding a frequency band consists of a generator, a distributor, a VHD, an adder, a switch, and an end adder.

A stabilized laser made in the second embodiment works in a similar way.

From the output of the synchronous detector 32, the signal passes the ZA filter and in stabilization mode is fed to the imaging unit 37. The voltage from the FPG 45 in this mode through the end adder 44 is applied to the UFL 35 and periodically sweeps the selected group of peaks. When the laser frequency passes through the peak peak, the voltage at the output of the synchronous detector 32 turns into O and the driver 37 produces a short pulse of positive polarity. Pulsed polysolar pulses with absorption by isotopes 25

the stroke of the driver 37 is fed to the input of the distributor 38. The valve 38 directs a pulse from the first peak to the control input of the WCH 39 of the first channel, from the second peak to the control input of the WCH 39 of the second channel, etc. At the moment of the reverse stroke of the FPG 45, a positive polarity pulse returns the distributor 38 to its initial state.

At the moment of arrival of the control pulse of a positive polarity from the output of the distributor 38, the UHV 39 selects and stores the voltage present at that moment at the output of the FPG 45. The voltage from the output of all channels of the VHD 39 is summed by the adder 40. The total voltage from the output of the adder 40 through the switch 41 is fed to the adder 44 and after it to the DCA 35. With a symmetric arrangement of the group of peaks relative to O sawtooth direct current through switch, When biasing the group pi gg, the output of the DC amplifier

the voltage of the output of the adder 40 is O

Covers to the right or left relatively connected to the piezoelectric element, another

A sawtooth voltage at the exit of the element is connected to the second vy-.

adder 40 appears voltage of the reference oscillator of the system

positive or negative field of the p-automatic frequency control, nosti. This is a voltage amplified by a gg thermal sensor with a thermopile, input and

UPT 35, is applied to the piezoelement, the output of which is connected to the output and.

That 28 also adjusts the frequency with a laser by the temperature stabilizer in such a way that the group of peaks, respectively, as well as the generator, which stabilizes the voltage, and the laser frequency returns, returning the P symmetrical position relative to the sawtooth. in the scanning mode, the switch 41 is opened and on the piezoelectric element 28 there is only a saw-tooth voltage that scans the laser frequency. In the capture mode for a single peak of saturated absorption, the switch 41 is open, and the UPT 35 input through the switch 36 is connected directly to the output of the synchronous detector 32. In this

The laser increases the speed of control of the frequency hold band.

The device can be implemented on the basis of a He-Ne / 1j laser with lengths

wavelengths of 0.63, 0.61 microns, etc., based on an Ar / lj laser with wavelengths of 0.54 microns, 0.5017 microns, etc., based on a grain-hole with wavelengths of 0.53, 0.52 microns et al. with other lasers, stabilizer and other absorbers with ultrafine structure of the spectrum.

This device is used to stabilize the laser frequency not for one peak, but for the center of gravity of a group of peaks, which will try to work reliably at a relatively high frequency reproducibility.

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Claims (1)

Invention Formula I. A stabilized laser containing an active element, an absorbing cell, mirrors placed on a Pie40 soelements, a photoreceiver connected through a series-connected preamplifier and a selective one. amplifier to the input of the synchronous detector, the other input of which is connected 45 with the output of the operative generator of the automatic frequency control system, and the output with the input of the filter, the output of which is connected to the input of the amplifier fi9.2 Compound tel A.Valankin Editor M.Vasilyeva A.Kravchuk; "P" / a / Proofreader N.Korol