| 摘要 |
A device for forming an interference grating on a sample. The device including a laser emitting a light beam of wavelength λ, a beam splitter plate splitting the light beam into first and second beams, the first beam being deflected in a first direction, a first stationary deflection mirror for deflecting the first beam onto a point P of the sample at a first constant angle of incidence &thetas;1, and at least one second stationary deflection mirror for deflecting the second beam along a final path that reaches point P of the sample at a second angle of incidence &thetas;2 in order to form an interference grating on the sample at a pitch that depends on the angular difference &thetas;. The device includes a movable deflection mirror to deflect the second beam from a plurality of first deflection points towards a plurality of second deflection points on the second mirror. |
