SU1398694A1 - Device for measuring zonal characteristic of optronic photoxhronograph - Google Patents

Abstract

The invention relates to the measurement of the parameters of electron-optical photographic chronographs (EOF) and the time of the analyzing electron-optical converters intended for recording ultrashort radiation pulses. A device for measuring the band characteristics of an EOF contains a picosecond laser 1, standards O) 2 and 3 Fabry-Perot. The edges of the dihedral angles oJ, formed by reflecting surfaces E 2 and 3 Fabry-Perot, are perpendicular to the optical axis of the device, and the difference Ad of the distance along the optical axis between their reflecting surfaces satisfies the condition Ad 5 T c. с, where С is the duration of a picosecond laser pulse 1j с - the speed of light. The device also contains a lens A, a photo register 7 and an information processing system 8. The device has enhanced functionality by taking into account the dynamics of the process at sweep speeds close to the speed of light. 3 il. (L with:

Description

from 0 oo and from 4;

The invention relates to the metrology of rapid process, namely, the imere of the parameters of electron-optical photo-chronograph (ES) F and the time of the analysis of the electron-optical converters (EOC) intended to register radiation ultrashort pulses and can be used. .. Used in experiments in physics, chemistry, biology medicine, communication and other fields of science and technology.

| The purpose of the invention is to measure the area of the EOF characteristics within the fero dynamic range at scanning speeds close to the speed of light,

I Fig. 1 shows a functional Lchem of the device for measuring the band Characteristic EOF1, pa of Fig. 2 is a test object projected onto the photocathode OF; Fig.3. - registered with: zhrana EOF photochrogram of the test object ..

Device for the determination of zone

characteristics of ESC1 contains sequentially arranged picosecond Laser 1, first 2 and second 3 Fabry-Perot standards, lens 4, wedge attenuator 5, EOF 6, recorder 7

m system 8 information processing. At the same time, the focal plane of lens 4 is aligned with the plane of the photo-cathode EOF (5... -

The device works as follows.

The I-C impulse generated by the α-fixed-second laser 1 is fed to the first Fabry-Perot reference standard 2. At the output of the second standard 3 Fzbri-Perot, the formed test object, which is a sequence of decreasing: 31 O intensity pulses, spaced in space and in time, is projected by lens 4 on the photo-Todd EOF 6 (see Fig. 2). Wherein . the edges of the dihedral tones about, formed by reflecting surfaces of standards 2 and 3 of Fabry-Perot, paraplels to the direction of the sweep of EOF 6о

The time-wrapped image of the chested object (see f) E5G.Z) consists of - n trains, and each of them, in its own eye;

Radium consists of pth pulses. With

 temporal; 1 delay between trains is proportional to the difference of distances. .

. iid between reflective; surfaces

- the first 2 and second 3 standards Fabry-Perot. Besides, .,

0

ud: Sc. with,

where ty is the pulse duration generated by a picosecond laser ;:

c is the speed of light in the air. At the entrance EOF 6 intensity 1 and I y ,. the pulses of neighboring trains are related to the following (by the ratio I hvi I, R

0

five

0

five

0

D

five

, where R is the reflection coefficient of identical mirrors of standards 2 and 3 of Fabry-Perot, and the intensities I ,,, ..., I y, of pulses in a train are equal to each other.

t

The wedge attenuator 5 ensures the operation of the EOF 6 within its dynamic range.

The image on the screen Eof 6 is read by the photographic recorder 7 and then transmitted to the information processing system 8.

At the output of the EOF 6, the above intensity ratios are violated due to the non-uniformity of the band characteristics of the EOF 6.

The information processing system 8 compares the obtained information from the EOF 6 screen with the one that corresponds to the test object, and builds the zone characteristic of the EOF 6 for those points of the photocathode onto which the image of the test object was projected. To determine the band characteristics over the entire field of the photocathode EOF 6, the image of the test object is projected onto other points of the photocathode. Thus, the device makes it possible to determine the zone characteristic of the EOF 6 within the dynamic range.

Formula and 3 about b. rete n i

A device for measuring the band characteristics of an electron-optical photo-chronograph, containing a sequence of optical test object formation, an objective and a photo recorder, and an information processing system whose input is connected by t output of the photo recorder, o, l, and h a-yu ee so that, with the aim of expanding-g. Functional capabilities, by taking into account the dynamics of the process at scanning speeds close to the speed of light, the optical test object generation system contains sequentially arranged picosecond ones. the laser, the first and second Fabry-Perot standards, with the dihedral angles,

313986944

formed by reflective surface and second standards Fabry-Perot ,.

The mirrors of the Fabry-Perot standards are parallel to the direction of linear deviation of the image on the screen of the electron-optical photochronograph, and the difference

yid distances along the optical axis between the reflecting surfaces of the per-:

selected from condition

 , with,

I

where b and is the pulse duration of a picosecond laser, c) c is the speed of light in air, m / s.

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Claims (4)

Claim A device for measuring the zonal characteristic of an electron-optical photo-chronograph, comprising a system for forming an optical test object, a lens and a photorecorder sequentially located along the optical axis, as well as an information processing system whose input is connected to the output of the photorecorder, revealing that expanding the functionality by taking into account the dynamics of the process ^ at scan speeds close to the speed of light, the system for forming an optical test object contains the following flaxically arranged picosecond laser, first and second FabryPerot standards, with edges of dihedral angles, 3 1398694 The 4 Fabry-Perot etalons formed by the reflecting surfaces of the mirrors are parallel to the direction of the linear deviation of the image on the screen of the electron-optical _g photochronograph, and the difference in the distances along the optical axis between the reflecting surfaces is per-: of the second and second Fabry-Perot etalons, selected from the condition '> 5 <s, where is the picosecond laser pulse duration, s) s is the speed of light in air, m / s. * Ot Phage 1 Order 3091 Circulation 39V Subscription VNIIIPI of the State Committee of the USSR. for Inventions and Discoveries ¹ 23035, Moscow, .. Zh-35, Raushskaya nab. , * d. 4/5 Production and printing company, Uzhhorod, st. Project, 4