Induced grating devices and method of making same

Details Induced grating devices and method of making same Induced grating devices and method of making same

1987-05-21

1988-12-27

Sikes, William L.

350 9615, 350320, 3501622, 35016221, 35016223, G02B 634, G02B 518

Patent

active

047936800

ABSTRACT:
It has been found that when a pulsed high-power laser beam is incident on the surfaces of a wide variety of materials, ripples are produced on such surface. This is due to interference between scattered waves and the incident beam producing intensity fringes, and hence localized heating. The dimensions of the ripples are dependent on the wavelngth of the incident light. This is used to produce permanent (after cooling) gratings on the outer surface of an optical waveguide, for example an optical fibre, on to which a laser beam is focussed by a lens system. Hence a grating whose length is a few hundreds of micrometers is produced. If the cladding is removed this effect of ripple generation is enhanced.

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