Diffraction technique for testing the resolution and sensitivity of Hartmann and Shack-Hartmann sensors.

A diffraction technique for testing the resolution and sensitivity of Hartmann and Shack-Hartmann sensors is proposed, substantiated theoretically, and studied experimentally. It is based on the generation and measuring of the wavefronts of monochromatic plane waves with a weak, one-dimensional, damped chirp modulation and without this modulation. The modulated and nonmodulated wavefronts are produced by the insertion of a half-plane straight-edge screen into the field of a plane wave and by withdrawal of the screen out of the field.

Combined computer-generated hologram for testing steep aspheric surfaces.

A novel type of a combined (or multiplex) computer-generated hologram (CGH) and a method for interferometric testing of steep axially symmetric aspheres is presented. The method is based on a hybrid CGH containing two different diffractive structures. The presented new type of Diffractive Fizeau Null Lens (DFNL) design eliminates the transmitted wavefront distortion (TWD) of the CGH substrate and increases the accuracy of the surface test.

Diffractive variable attenuator for femtosecond laser radiation control.

We present a diffractive phase variable attenuator for femtosecond laser radiation control. It allows the control of beam power up to 0.75.

Polar coordinate laser pattern generator for fabrication of diffractive optical elements with arbitrary structure.

A precision laser pattern generator for writing arbitrary diffractive elements was developed as an alternative to Cartesian coordinate laser/electron-beam writers. This system allows for the fabrication of concentric continuous-relief and arbitrary binary patterns with minimum feature sizes of less than 0.6 microm and position accuracy of 0.