PL99147B1 - METHOD OF OBTAINING SEQUENCES OF ULTRA-FAST INTERFEROGRAMS - Google Patents

Description

The present invention relates to a method of obtaining ultrafast interferogram sequences. The invention is applicable to the study of ultrafast impulse phenomena in the field of plasma physics or other nanosecond processes. There is a known method of obtaining ultrafast time sequences using electro-optical light amplifiers. In this method, the examined field is illuminated with a source of continuous light. The light beam is transformed into an electron beam with the help of a photocathode. In this method, the shutter functions are performed by capacitor covers to which electric pulses are applied. The image of the tested field is obtained on the luminance screen. There is also a known method that uses the holographic effect. This method duplicates a typical holographic system with a subject and reference bundle. The subject light beams are formed in such a way that they pass through the examined area. Here, a pulsed beam of light is used. The time sequence of individual frames is obtained in this method by using an optical delay line with partially and fully reflecting mirrors. , and the formed light beams are directed to the expanding telescope in such a way that parallel and converging between the light beams q of the diameter required by the size of the field of observation, are introduced into the interferometer and that these beams intersect in the area of the observation field. Then, parallel and divergent between each other, the light beams are introduced into the detection system where they are directed to separate recording devices. The method according to the invention does not require the use of electro-optical light converters with electronic control systems used in the electro-optical method. Moreover, the method does not require the use of a complicated optical system as in the method using the holographic effect where it is required to multiply the path to obtain a particular frame. In the method according to the invention, it is possible to obtain a larger field of observation compared to the fields obtained in known methods.2 99 147 The invention is explained by the example of obtaining a sequence of three interferograms for tracking the dynamics of ultrafast phenomena. The light source is a laser system 1 emitting single light pulses of a duration of several nanoseconds. The pulsed light beam is introduced into the delay-forming system 2 with partially and fully reflecting mirrors. The obtained convergent light beams are then introduced into the extending telescope 3 to obtain the desired field of observation. The extended light beams are then introduced to the interferometer 4 where they intersect at the place of observation 6. From the interferometer 4 divergent beams are then introduced to the detection system 5 where it is directed they are transferred to separate recording systems in the form of cameras. PL

Claims (1)

1. Patent claim A method of obtaining a sequence of ultrafast interferograms using a pulsed light beam, characterized in that the pulsed beam of laser light is introduced into the delay-forming system, and then the formed light beams are directed to the expanding telescope to obtain a given field of observation, and then they are passed to the interferometer, where they intersect in the area of the observation field, and then the obtained light beams are introduced into the detection system, where they are directed to the recording devices. Wash. Typographer. UP PRL, circulation 120 + 18 Price PLN 45 PL