A compact and rugged optical correlator is described. It employs a lensloss matched spatial filter that is formed at one wavelength. Correlation is performed with a laser diode at a second wavelength using an imaging lens in a scaling correlator topology.

A method of rotation-photograph was suggested by which the Kinoform with axial rotating symmetry was made up, and experimental results of the spherical Kinoform was presented. The method reduces the noise caused by discrete phase on reconstructing imago. This method can apply to either spherical or aspherical kind of Kinoform with axial rotating symmetry.

The Jones 2×2 matrix of the corner prisms is found. Various forms of the Michelson interferometer consisted of two corners are discussed. In the case that the beam in one arm passes through the edge of a corner and the beam in another arm does not pass through any edges of another corner, the interferometrio field is divided into two parts. The phase difference between these two parts is π/2 and the fringes contrast in the whole field is over 90%.

This paper deals with the Abel transformation of Mach-Zehnder interferogram analysis of supersonic airflow about cylindrical or spherical symmetric projectiles containing shock wave.

An achromatic lens system may consists of several cemented or separated groups of orown and flint glasses. If there is a value of chromatic aberration in each group, and a certain relationship between the positive or negative sign of chromatic aberration and the selection of glasses, the secondary spectrum of the whole lens system can be reduced to any small value. According to this principle, two complicated triplets with secondary spectrum corrected, are given as an example. Their focal lengths are 1.5 m, F numbers are 7, and field angles are 15° and 18° respectively. It is entirely common glasses used in one of the lens.

In this paper the transmission of paraxial light beams was analyzed based on the gradient vector potential of electromagnetic field.

Starting from the diffraction integration in terms of ray matrix elements, the optical transfer functions have been derived for complicated optical system. They are also represented by the ray matrix elements and have the following generality: All are permitted in the system that there are complex lenslike media with quadratic index and gain(or loss) and Gaussian aperture (or Gaussian mirror) with Gaussian transmissivity (or reflectivity); the observation plane can be located at any plane; the location of aperture can be arbitrary.

This paper reports the experimental results about the ultrashort pulses from two tunable dye lasers, which are synchronously pumped by the second harmonic of an active-passive mode-locked Nd: phosphate glass laser.

The experimental results for N2+ laser are presented. The measured optimum partial pressure of N2+ was 2.4 torr at a total pressure of 2 atm. in He/N2 mixture. Kinetics of formation and quenching are analysed and discussed. The spectra of the N2+ laser at 427.8 nm were determined with the second order spectra of a 2-meter grating spectrometer. We observed that the 427.8 nm line is a doublet.

An acousto-optically mode-locked Nd:YAG laser, prelasered with an electro-optic Q-switch, energy storage amplified, and modulated with an acousto-optic modulator operated at 50 MHz is described. In the case of embedding a dye-cell into the cavity, the mode-locked laser can be operated either actively or passively. The performance of this laser is as follows: the pulse width varying continuously from 20 ps to several ns, energy of a single pulse greater than 0.1 mJ, and the amplitude stability of the pulse train better than 90%.

The model JQY -800 la3er holographic interferometer is an instrument used for uniformity measurement of large size optical glass by means of double-exposure holographic differential interferometry. The measurement accuracy of ±5xl0~7 can be obtained. The characteristics of structure design are as follows: 1. Foamed rubber is used as vibration-proof leading to a simple construction, Hz vibration can be isolated. 2. The optical path difference introduced by work-table deformation under heavy sample is eliminated, using the method of placing the sample holder at the support point. 3. The sample mount consists of three-dimension angle micro-adjust structure instead of common used ''point, line, plane" positioning structure. It is convenient for machining, assembly, and the requirement of accuracy can be met.

A Fourier hologram with informations in the reference beam can be used as a holographic translator. The analysis is made based on the reciprocity of object beam with reference beam and experimental results are presented in this paper. The effect has been improved through the spatial amplitude modulation.

It is expected that, on the Fourier-transform plane of objective lens, the point holographic image formed by object beam and reference beam is capable of higher memory density of Chinese characters and other foreign letters. Therefore, the memory limit which is related to the relative aperture F of the objective lens, the wavelength of the illustrating light and the number of terms of frequency and spectrum in the image are discussed. And all of these have been identified by our experiments.

The description of existing pulsed mode zero-setting gratings in connection with their imperfection in the theory relevant to the locating accuracy is given. And at the same time, a new type of zero-setting gratings, namely, of the differential mode zero-setting gratings is suggested in this paper.