Browse Prior Art Database

TRAVELING LAMB WAVE ACOUSTIC SCAN LENS

IP.com Disclosure Number: IPCOM000023694D
Original Publication Date: 1978-Oct-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 257K

Publishing Venue

Xerox Disclosure Journal

Abstract

To increase the number of resolvable spots generated by a linearly scanned laser beam, a traveling acousto-optic cir-cular lens (i-e-, one having equal optical power, both parallel and perpendicular to the direction of translation) is generated in a transparent acoustic waveguiding structures A symmetric Lamb wave is chosen to produce the circular lensing-

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XEROX DISCLOSURE JOURNAL

TRAVELING LAME WAVE ACOUSTIC
SCAN LENS
David
K~ Biegelsen

Proposed Classification
U~S. Cl~ 350/161R

Into Cl~ G02f 1/28

To increase the number of resolvable spots generated by a
linearly scanned laser beam, a traveling acousto~optic cir~
cular lens (i~e~, one having equal optical power, both
parallel and perpendicular to the direction of translation) is
generated in a transparent acoustic waveguiding structures A
symmetric Lamb wave is chosen to produce the circular lensing~

The acousto~opticguide 10 is annular in shape and comprises a
thin plate of photo~elasticmaterials The driver 12 provides
a signal source for the phased electro~acoustictransducers 14

22

Volume 3 Number 5 September/October 1978 335

[This page contains 1 picture or other non-text object]

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TRAVELING LAMB WAVE ACOUSTIC SCAN LENS (Cont~d)

to produce a unidirectional traveling Lamb wave 16 in the lens
10. The wave 16 has a narrow neck 18 which is the point of
maximal charge in index of refraction~ When wave 16 reaches
the scan window 20, the translating laser beam via acousto~
optic interaction occurring in the region of neck 18 results
in a circularly focused beam of 1ight~

The acoustic absorber 22 may be provided to attenuate or
absorb the wave 16 after the wave has passed the window 20, or
the absorber can be deleted and a resonance condition achieved
in lens 10 with transducers 14 wherein less energy is needed
from the transducers to circulate the Lamb waves,

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