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Browse Prior Art Database

Ultra High Speed Optical Deflection Device for Detecting Laser Pulses

IP.com Disclosure Number: IPCOM000118220D
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 103K

Publishing Venue

IBM

Related People

Coufal, HJ: AUTHOR [+2]

Abstract

Disclosed is a device which nonlinearly enhances the angular velocity of a deflected optical beam by reflecting it from a convex surface. The beam divergence is compensated by a positive optical element which allows a temporally modulated or pulsed laser beam to be dispersed spatially and recorded on a position-sensitive optical detector.

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Ultra High Speed Optical Deflection Device for Detecting Laser Pulses

      Disclosed is a device which nonlinearly enhances the angular
velocity of a deflected optical beam by reflecting it from a convex
surface.  The beam divergence is compensated by a positive optical
element which allows a temporally modulated or pulsed laser beam to
be dispersed spatially and recorded on a position-sensitive optical
detector.

      In its simplest form, the device consists of an optical
deflection device, such as a rotating mirror, a convex surface of
reflection, a compensating lens to reduce beam divergence, and a
position-sensitive optical detector.  Fig. 1 shows this device, where
the rotating mirror scans the laser beam across the surface of a
cylindrical mirror.  Because of the curvature of the cylindrical
mirror, the laser beam has its angular velocity nonlinearly enhanced
depending upon the ratio of the distance (J), from the rotating
mirror to the cylindrical mirror, to the radius (R) of the
cylindrical mirror.  The compensating lens is used to focus the beam
onto the position-sensitive detector and to compensate for the beam
divergence introduced by the cylindrical mirror.  In this way, not
only is the angular velocity of the beam enhanced but also the
achievable temporal resolution is increased, since the beam diameter
at the detector is kept small while the angular dispersion is greatly
enhanced.

      Fig. 2 shows the mathematical relationship for angular...