Tunable diffractive device

Details Tunable diffractive device Tunable diffractive device

2005-09-20

2005-09-20

Harvey, Min Sun (Department: 2828)

Coherent light generators

Particular beam control device

Tuning

C372S096000, C372S102000

Reexamination Certificate

active

06947453

ABSTRACT:
In a tunable optical source, a zone plate device100is used to provide frequency selective feedback to a laser diode110.The zone plate device100is positioned to receive an output mode of the laser diode110and to return a frequency selected image of the mode spot to the laser diode110.By changing the refractive index of material of the zone plate device100,it is possible to change the frequency providing the image at the point of return to the laser diode110.This allows the zone plate device100to be used in tuning the optical source, without using moving parts. In an embodiment, the zone plate device100is at least partially fabricated in an electro-optic material such as SBN:75 and can therefore be tuned by using electrodes to apply an elecric field across it. The zone plate device100can be coupled directly to the laser diode110or via a waveguide section105which can be used to increase the output mode spot size from the laser diode110for delivery to the zone plate device100.The zone plate device100can alternatively be used as a standalone component for filtering optical radiation from other sources. Tunable optical sources can be used for instance in communications, particularly wavelength division multiplexing.

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