Apparatus for making frequency-variable grating using holographical method

Abstract

The device comprises the laser light source, the beam-expanding telescope, the beam splitter, the reflector, the cylindrical mirror and the recording media. The laser beam from the laser source being expanded by the telescope enters the beam splitter to divide the beam into two light beams: the reflected beam and the transmitted beam. The reflector reflects the reflected beam passed through the cylindrical mirror to the recording media as the object wave. The reflector reflects the transmitted light to the holographic recording media as the reference wave. The interference between the object wave and the reference wave forms hologram recorded on the media. The spatial frequency of the variable frequency grating made by the device is changed in linearity.

Description

Technical field: [0001] The invention relates to a frequency-variable grating, in particular to a device for making a frequency-variable (or complex pitch) grating by holography. Background technique: [0002] In recent years, variable frequency gratings have been widely used in defense industry, scientific research, industrial production and other departments, especially in synchrotron radiation soft-X-ray beamlines, which have been widely used. For example, frequency conversion gratings are used in Spring-8 in Japan, synchrotron radiation facilities in Hefei and Beijing in China. Changing the groove spacing of the grating according to a certain rule can reduce aberrations, shorten the space length of the monochromator, improve the efficiency of the monochromator, etc., and can also achieve self-focusing and overcome various problems introduced by the focusing mirror at the output end. Aberrations and more. [0003] The frequency conversion grating is made by using the me...

AI Technical Summary

Problems solved by technology

The advantage is that it is relatively simple, and it does not have strict requirements on the accuracy of the experimental device like the previous method. The disadvantage is that since the incident light is incident from the curved surface of the cylindrical mirror, in order to make the spatial frequency of the interference fringes change according to the linear law, The value of the incident angle is limited, and as a result, the spatial frequency cannot be made very high (see prior art [2]: M.V.R.K.Murty et al., Optical Engineering, 1979, 18, No.5, 526)

Images