Optical assembly
An optical assembly, and in particular an optical assembly which uses a microlens array or a micromirror array to reduce speckle. It further concerns an optical component which comprises a micromirror array.
1. An optical assembly comprising:
a microlens array, the microlens array comprising a first surface to receive light and a second surface to emit light;
a Fresnel lens disposed adjacent to the second surface to optically communicate with the second surface of the microlens array; and
a pin hole array disposed adjacent to the second surface of the microlens array between the microlens array and the Fresnel lens, the pin hole array disposed a distance from the microlens array substantially equal to the focal length of the microlens array.
2. The optical assembly of claim 1 , comprising an array of lenslets defining the first surface.
3. The optical assembly of claim 2 , wherein a size of each pin hole of the pin hole array is greater than or equal to a spot size of the light emitted by the microlens array.
4. The optical assembly of claim 3 , wherein the size of each pin hole of the pin hole array is between 1 and 100 micrometers.
5. The optical assembly of claim 1 , comprising a telecentric lens to optically communicate with the microlens array.
6. The optical assembly of claim 1 , wherein the pin hole array comprises light absorbing material.