Patent ID: 8902506
Filing Date: 2014-12-02
Classification: G02B

Abstract:
1. A despeckle element comprising: a transparent material having a first surface including a plural number of optical steps and a second surface opposite the first surface, the second surface having a plural number of microlenses, each of the number of optical steps being in a one-to-one correspondence with at least one of the microlenses, one of the first surface and the second surface is configured to receive collimated light having a coherence length and a remaining one of the first surface and the second surface is configured to pass the collimated light separated into a plurality of beamlets corresponding to the number of microlenses, a height of each step of at least two of the optical steps is configured to produce an optical path difference of the collimated light away from: a) a zero path difference peak of visibility of the collimated light, and b) any side mode peaks of visibility of the collimated light; and the collimated light is a coherent light beam pulsed to include multi-mode oscillation.