1. A flat - field etched diffraction grating ( EDG ) wavelength demultiplexer is much more convenient in fabrication.

2. A novel wavefront curvature sensor with a distorted diffraction grating (DGWFS) is described and computer simulations of its principle is made.

3. The characteristics of diffraction grating of oblique incidence light wave are analysed theoretically and verified in experiments.

4. Plane diffraction grating, logarithmic amplifier and stable constant- current source are used in the system, thus the performance of the instrument is enhanced significantly and the cost is reduced.

5. When the laser beam goes through the diffraction grating, it is split up into a central bright beam plus a number of side beams.

6. Finally adopted a diffraction grating monochromator spectral characteristics of optoelectronic devices as measuring equipment.

7. The recent years(http://), the diffraction grating technology is valued people's day by day.

8. Based on the interference of diffraction grating and the technology of CMOS linear image sensor, the refraction index of transparent materials is measured automatically.

9. As one of the important technical specifications of diffraction grating, diffraction wave front aberration directly affects the grating resolution.

10. A reflecting hologram diffraction grating was fixed to the stage to form a closed loop displacement measuring system.

11. The external cavity is made up of fast axis collimator, collimating optical system and diffraction grating.

12. By means of trigonometric calculation, the intensity distribution of diffraction grating is obtained.

13. In order to improve the convergence rate, a correct Fourier expand method was introduced to differential theory of the finite conductivity diffraction grating.

14. Some integrated optics devices can be made based on the interdigital electrooptic bragg diffraction grating.

15. The light is emitted by the laser diode and enters a diffraction grating.

16. In this paper, the flat field polychromator (SPD - I) using an aberration - corrected flat fie1d holographic concave diffraction grating as both spectroscopic and oPtical imaging element is re-POrted.

17. As the key device of a DWDM system, Etching Diffraction Grating (EDG) is one of the most potential types of planar waveguide DWDM devices.

18. The results show that the spectrum characteristics of F-P interferometer with gain medium is better obviously than that of diffraction grating.

19. This paper presents a new non-contact displacement sensor with diffraction grating metrology system based on an improved Foucault focus detection method.

20. The theoretical background and details of heterodyne interferemetry and diffraction grating interferemetry are described.

21. Emphasis is put on the experimental research on its tunable range and the bandwidth narrowing with a diffraction grating and a Fabry-Perot etalon.