Apparatus for modulating monochromatic optical radiation

FIELD: physics, optics.

SUBSTANCE: invention relates to optical engineering. The apparatus for modulating monochromatic optical radiation comprises an optically transparent medium in which are mounted a splitter for splitting monochromatic optical radiation into a first and a second propagation channel, a reflecting element in the second channel, a coherent summation portion for forming modulated monochromatic optical radiation. The splitter used for splitting monochromatic optical radiation into a first channel and a second channel is a splitting cube consisting of two identical triangular prisms joined by their large faces. The first channel is equipped with its own reflecting element. Each reflecting element is deposited on the corresponding face of the splitting cube on the path of the monochromatic optical radiation in the first and second channels. The splitting cube is mounted such that it can move back and forth outside the interface plane of its prisms, and the angle α between the velocity vector of the back and forth movement and the interface plane of the prisms of the splitting cube is selected from the relationship , where fm is the required modulation frequency of the monochromatic optical radiation, λ0 is the wavelength of monochromatic optical radiation at the input of the splitting cube, υ is the velocity of the splitting cube.

EFFECT: resistance to vibrations and pushing, capacity to operate in all spatial orientations.

2 dwg

 

The invention relates to optical techniques, particularly to modulators of monochromatic optical radiation.

A device for modulation of monochromatic optical radiation [EN 2239801 C2, MPK7 G01J 3/00, G02B 26/00, publ. 10.11.2004]containing the light source, the photodetector, the control unit and processing, Michelson interferometer, in which one of the mirrors installed with the possibility of changing the optical difference of the stroke on the harmonic law.

The disadvantage of this device is sensitive to vibrations and shocks, the possibility of changing the settings of the mirrors of the Michelson interferometer with a change in spatial orientation.

A device for modulation of laser radiation [EN 2411620 C1 IPC (2006.01) H01S 3/10, G02B 26/02, publ. 10.02.2011], comprising a platform mounted on it with substrate. The platform is fixed with the possibility to perform a reciprocating motion relative to the axis of rotation. On the surface of a substrate formed of a relief diffraction grating with a rectangular profile. The depth profile does not exceed a quarter of the wavelength of the modulated laser radiation. On top of the diffraction grating applied mirror reflective coating. After reflection from the surface of the substrate, the laser light is divided into several diffraction orders. After spatial what about the slotted filter radiation is emitting zero order, modulated in intensity.

The disadvantage of this device is sensitive to vibrations and shocks, the possibility of changing the configuration of the mirror reflective coatings upon a change in spatial orientation.

A device for modulation of monochromatic optical radiation [EN 2247420 C1, IPC 7 G02B 26/06, publ. 27.02.2005], selected as a prototype containing optically transparent environment in which along the optical radiation is set separator monochromatic optical radiation into the first and second distribution channels, a reflective element, a plot of the coherent summation of optical radiation in the first and second channels of propagation of optical radiation. As device selection of optical radiation in the first distribution channel selected plane of the entrance in the optically transparent medium, and the second channel of propagation of optical radiation of a selected mirror reflective element. Mirror reflective element is oriented parallel to the plane of the entrance in the optically transparent medium. The plane of the input optical radiation in the optically transparent medium and the plane of the reflective element of the second transmission channel are located with the possibility of a continuous change of the distance between them.

The disadvantage of this device is the sensibility is to vibrations and shocks, the possibility of changing the settings of the mirror reflective element when the change in spatial orientation.

The objective of the invention is to develop a device modulation of monochromatic optical radiation, resistant to vibrations and shocks, working in all spatial orientations.

The problem is solved due to the fact that the device for modulation of monochromatic optical radiation, as well as in the prototype, contains an optically transparent medium, in which in the course of monochromatic optical radiation installed separator monochromatic optical radiation into the first and second distribution channels, reflective element in the second channel of distribution, the plot of the coherent summation for the formation of modulated monochromatic optical radiation.

Unlike the prototype separator monochromatic optical radiation into the first and second distribution channels used by dividing a cube composed of two identical triangular prisms, combined with their large faces. The first distribution channel is equipped with its reflective element. Each reflective element deposited on the associated face of the dividing cube along the monochromatic optical radiation in the first and second channels u is defamiliarization. Dividing cube is installed with the possibility of reciprocating movement outside the plane of the pair of prisms separating Cuba, and the angle α between the velocity vector of the reciprocating motion and the plane interface separating prisms cube selected ratio

,

where fm- the frequency modulation of monochromatic optical radiation,

λ0is the wavelength of the monochromatic optical radiation input into a separating cube

υ - velocity of dividing the cube.

Device for modulation of monochromatic optical radiation resistant to vibrations and shocks, working in all spatial orientations, so as interferometer used dividing cubic one-piece design of the proposed device for modulation of monochromatic optical radiation as resistant to vibrations and shocks, and to a spatial position relative to the earth, because all the external forces act simultaneously on a monochromatic optical radiation in the first and second distribution channels. Possible changes in the relative position separating Cuba and source of monochromatic optical radiation, changing their mutual spatial orientation, are small and do not have significantly what about the impact in terms of modulation.

Figure 1 shows the diagram of a device for modulation of monochromatic optical radiation.

Figure 2 shows a screen image of the oscilloscope GDS-2204, which shows the waveform of the time course of modulated monochromatic radiation on the example of the laser.

Device for modulation of monochromatic optical radiation contains on a course of monochromatic optical radiation, for example, generated by the laser LGN-118, dividing cube 1, for example, a cube beam splitter 24×24×24 company "NPP FOCUS" with svetalana 1/1, consisting of two identical triangular prisms, paired with their large faces 2. On the dividing faces of the cube 1 in the course of monochromatic optical radiation in the first 3 and second 4 distribution channels formed reflecting elements 5, for example, the mirror surface by vacuum deposition film of aluminum. Dividing cube 1 is installed with the possibility of reciprocation, for example, on motorisierung linear translator MT firm Vicon Standa". Stepper motor type FL42STH47-1204B linear translator MT associated with the controller type 8S1-USBhF.

The stepper motor is operated in manual mode. Dividing cube moved in directions outside the plane of the pair of triangular prisms separating cube 1.

M is normalizable optical radiation, generated by a laser, directed by dividing the cube 1. Linear translator led dividing cube 1 in a reciprocating motion. The angle α between the velocity vector of the reciprocating motion and the plane of the pair of triangular prisms separating cube 1 was chosen from the relation:

.

Shared monochromatic optical radiation using a separating cube 1 on the first 3 and second 4 channels of distribution. In each of the distribution channels 3 and 4 of monochromatic optical radiation sent back with reflective elements 5. Due to the reciprocating motion of the separating cube 1, changing the frequency of the monochromatic optical radiation through two distribution channels 3 and 4.

On the plot coherent spatial summation combined streams are passed through the first 3 and second 4 distribution channels, and received a stream of modulated monochromatic optical radiation.

The modulation frequency of the monochromatic optical radiation was determined according to the formula

.

Assembly device for modulation of monochromatic optical radiation is to install a separating cube 1 on a linear translator, the consolidation of the translator relative to the direction of the optical what about the radiation under the estimated angle and the orientation of the input face dividing the cube 1 is perpendicular to the direction of monochromatic optical radiation.

From waveform data for the first channel CH1 of the oscilloscope shown in figure 2, it follows that the modulation frequency Δf monochromatic optical radiation of helium-neon laser LGN-118 is 66, (6) kHz.

The calculated frequency fmcorresponding to the speed υ=0,042 m/s dividing cube 1 angle φ=45° to the direction of monochromatic optical radiation, was 65,75 kHz.

Thus, the comparison of the received modulation frequency Δf from the settlement gives the difference of 0.91 kHz, which does not exceed the measurement error is half the price division of the oscilloscope scale 1 ISS. The laser LGN-118 generates radiation in multiple longitudinal modes. As the ratio of the intensities of the laser radiation at the fundamental and first modes is 30, then the signal amplitude of 1.5 In the high-frequency component has an amplitude of less than 50 mV. Operation for more than 5 hours with breaks showed that the modulation frequency remains constant within the error frequency by determining the time intervals from the oscilloscope screen and their conversion.

Device for modulation of monochromatic optical radiation containing optically transparent medium, in which in the course of monochromatic optical radiation installed separator monochromatic optical radiation at the first and second Cana is s distribution reflective element in the second channel of distribution, the plot of the coherent summation for the formation of modulated monochromatic optical radiation, characterized in that the separator monochromatic optical radiation into the first and second distribution channels used by dividing a cube composed of two identical triangular prisms, combined with their large faces, the first distribution channel is equipped with its reflective element, with each reflective element deposited on the associated face of the dividing cube along the monochromatic optical radiation in the first and second distribution channels, dividing cube is installed with the possibility of reciprocating movement outside the plane of the pair of prisms separating Cuba, and the angle α between the velocity vector of the reciprocating motion and the plane interface separating prisms cube selected ratio
,
where fm- the frequency modulation of monochromatic optical radiation,
λ0is the wavelength of the monochromatic optical radiation input into a separating cube
υ - velocity of dividing the cube.



 

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