Planoconvex lens and meniscus lens change the divergent angle of 30° into 7.12° and 12.96°,enhance the illumination in the distance of 1 meter 18.92 times and 5.68 times,extend the transmission distance to 4.4 m and 2.4 m respectively.
In proposed method, the Cerenkov radiation pass through a 1-meter focal-length thin convex lens, and a CCD camera is used to capture two images of Cerenkov radiation at the focal plane and at the image plane of the lens respectively.
This paper describes the measuring of focal length of a convex lens using Moire fringes in identical direction at a distance of 2f' from the lens, which is formed by interference fringe and a Ronchi grating.
Using a lens array to make the laser energy distribution uniform,the diameter of focus spot φ 400mm, I a ≈0.55×10 14 W/cm 2,CH plane targets, m· =2×10 5g/cm 2·s from the crystal specrometers, m· =1.35×10 5g/cm 2·s from X ray streak camera, p =1.6×10 12 Pa.
Measurements show that the lens has no spherical aberration across the total effective aperture of 8 mm, and for a 4 mm-width beam and a lens with 20 mm focal length, the width of the focus is about 4 μm.
Under the condition of given pump laser energy, using a lens with short focal length to focus the Cr∶LiSAF electrooptical Q- switched laser pulses into CS 2 SBS-cell, the backward SBS scattering of broad-band and multi-transverse-mode Cr∶LiSAF laser pulses is realized, and the effective pulse width′s compression is observed.
The measurement of HMS activity is based on continuous monitoring of the potential of the ferricyanide-ferrocyanide system (where ferricyanide is an artificial electron acceptor) in the presence of a lens.
We propose a form of a lens corrector at the prime focus of a hyperboloidal mirror that provides a flat field of view up to 3° in diameter at image quality D80>amp;lt;0.8 arcsec in integrated (0.32-1.1 μm) light.
Since such a lens can have a relatively large length comparable to the focal length, the thin-lens approximation is inapplicable.
We calculate the image propagator that describes the focusing of a parallel beam and the image transfer (the focusing of a microobject), as well as the Fourier transform of the transmission function for a microobject with a lens, is calculated.
For the Gaussian model of a lens, a Green-function-based method is proposed to compute the intensity distribution in the lens image plane.