Apparatus and methods of broadband second harmonic generation

Details Apparatus and methods of broadband second harmonic generation Apparatus and methods of broadband second harmonic generation

2011-03-01

2011-03-01

Sanghavi, Hemang (Department: 2874)

Optical: systems and elements

Optical frequency converter

Harmonic generator

C359S332000, C372S022000

Reexamination Certificate

active

07898730

ABSTRACT:
Apparatus and methods for second harmonic generation with a waveguide. In one embodiment, a method includes the steps of providing a waveguide, wherein the waveguide has a substrate, and a polydomain epitaxial thin film on the substrate, wherein the polydomain epitaxial thin film defines a plane and has a first surface and a second, opposite surface defining a body portion of the polydomain epitaxial thin film therebetween with a film thickness, l, and wherein the polydomain epitaxial thin film has a coherence length, lc, and exposing the waveguide to an incident photon beam with a wavelength and a focal point such that the incident photon beam is incident to the plane of the polydomain epitaxial thin film with an angle θ that is formed between the incident beam and the plane of the polydomain epitaxial thin film and satisfies the condition of 0<θ<90, wherein the polydomain epitaxial thin film is formed with the following condition satisfied: l<lc. As generated, the second harmonic generation has a conversion efficiency substantially independent of the wavelength of the incident photon beam over the visible spectra range.

REFERENCES:
patent: 5198837 (1993-03-01), Ikshizaka et al.
patent: 7218799 (2007-05-01), Deliwala
patent: 7224878 (2007-05-01), Wessels et al.

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