| 摘要 |
<p>Abstract Today spatial light modulators are built using either Liquid Crystal on Silicon (LCOS) or a series of high precision mechanical actuators. The former can modulate signals at up to around 60Hz, while the latter can achieve speed of between 3 and 8 kHz. This device is a mechanical solution which provides the encoding predetermined mSequences at much faster rates, specifically in the Megahertz range. The approach is based on new advances in precision lathe technology. A large reflective disc has the outer edges of its front surface machined to contain predetermined mSequences (or any other desired code) in a series of closely spaced concentric circles. An Ultra Fast Spatial Light Modulator - Drawings Concentric rins of reflective mSequences Highly reflectiee machaed disc Axe mount Figure 1- The reflectiveface ofthe Ultra FastSlM +1s are represented by areas which are not machined -is are represented by areas which are machined -1 -1 + +1 -1 Track 1 The depth of machining is half the phase change for normally incident light +1 +1 +1 +1 -1 +-1 + -1 +1 -1 -1 Track 2 Figure 2- Sections of Concentric Tracks around the Reflective Disc Rotatable eose to accmmdate different beam heights AR coated windo reeaing active section of disc Transforner and variable speed motor J i ller almentldes Incident laser Replaceable discs for different modulations and codes standard s post P c Front View Side View Figure 3 -A Schematic Representation of the Ultra Fast SLM rinwnlnnrflnnrm nt Pae I</p> |
