圆盘型全息扫描器的改良

Improvement for Holdgraphic Disk Scanners

通常,圆盘型全息扫描器产生圆弧状的扫描线,从而限制了扫描跨度,也影响了扫描器的分辨能力。本文提出一种能产生大跨度、直线扫描的圆盘型全息扫描器之结构方案。用等周期的直线全息光栅代替一般圆盘型全息扫描器中的全息透镜,并在光栅后增设一两次反射的直角角镜。全息光栅将入射其上的细激光束偏折构成扫描光束,经由直角镜的双反射,再次经过全息光栅衍射,最终在扫描平面上形成直的扫描线。文中对上述方案的工作原理作了分析和试验验证。此外,对全息扫描器的应用作了进一步的探讨。

Now scan-lines were usually produced in holographic disk scan- ners,and so the scan-length and resolution of scanners would be limited, method for producing large span and straight line scanning is proposed.Gene- ral holographic lenses used as scanning elements are replaced by a series of equalperiod holographic gratings with straight grating lines,and an orthogo- nal mirror system is used for accomplishing secondary diffraction.A narrow beam of laser is deflected by the grating and is ref...