Coherent light generators – Particular beam control device – Tuning
Reexamination Certificate
2003-11-07
2009-08-11
Rodriguez, Armando (Department: 2828)
Coherent light generators
Particular beam control device
Tuning
Reexamination Certificate
active
07573919
ABSTRACT:
A method of controlling an external-cavity tuneable laser which has a wavelength-elective tuneable mirror, in which wavelength selectivity is achieved by an electrical signal provided by an alternating voltage. The tuneable mirror has a liquid crystal material, a diffraction grating and a planar waveguide optically interacting with the grating. The diffraction grating and the waveguide form a resonant structure that reflects only a selected resonance wavelength from among all the other wavelengths impinging thereon. Depending on the amplitude of the voltage applied to the tunable mirror, the tuneable mirror reflects radiation only at a given wavelength. The lasing output wavelength of the laser is selected to correspond to the resonance wavelength of the tuneable mirror. Accurate selection of the emission wavelength (frequency) of the tuneable laser by the tuneable mirror can be derived from the analysis of the signal modulation induced by the AC voltage applied to the tuneable mirror.
REFERENCES:
patent: 6205159 (2001-03-01), Sesko et al.
patent: 6215928 (2001-04-01), Friesem et al.
patent: 6366592 (2002-04-01), Flanders
patent: 6526071 (2003-02-01), Zorabedian et al.
patent: 6717965 (2004-04-01), Hopkins, II et al.
patent: 2002/0054614 (2002-05-01), Jin
patent: 2003/0007522 (2003-01-01), Li et al.
patent: 2003/0007526 (2003-01-01), Pontis et al.
patent: 2003/0012239 (2003-01-01), Daiber et al.
patent: 2003/0142702 (2003-07-01), Pontis et al.
patent: GB 2 357 589 (2001-06-01), None
Patel et al., “Frequency Locking of a Tunable Liquid-Crystal Filter”, Journal of Applied Physics, vol. 71, No. 5, pp. 2464-2466, (1992).
Cattelan Susanna Maria
De Donno Marco
Pianciola Aurelio
Romano Andrea
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
PGT Photonics S.p.A.
Rodriguez Armando
Stafford Patrick
Telecom Italia S.p.A.
LandOfFree
Wavelength control of an external-cavity tuneable laser does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wavelength control of an external-cavity tuneable laser, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wavelength control of an external-cavity tuneable laser will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4088977