Coating for optimising output coupling of em radiation

Details Coating for optimising output coupling of em radiation Coating for optimising output coupling of em radiation

2007-01-26

2009-12-01

Petkovsek, Daniel (Department: 2874)

Optical: systems and elements

Optical frequency converter

Parametric oscillator

C385S122000

Reexamination Certificate

active

07626756

ABSTRACT:
A coating between a nonlinear crystal and a silicon prism coupler, prevents transmission of radiation scattered within the crystal by filtering out frequencies outside the silicon bandgap to avoid free carrier absorption, but transmits THz frequencies that correspond to the bandgap.

REFERENCES:
patent: 6697186 (2004-02-01), Kawase et al.
patent: 6903341 (2005-06-01), Imai et al.
patent: 2008/0298757 (2008-12-01), Dunn et al.
International Search Report for corresponding PCT/GB2007-000295, completed Mar. 27, 2007 by Albert Smid of the EPO.
Kawase K et al: “Terahertz Wave Parametric Source”; Journal of Physics D. Applied Physics, IOP Publishing, Bristol, GB, vol. 35, No. 3, Feb. 7, 2002, pp. R1-R14, XP002348893, ISSN: 0022-3727, cited in the application See in particular: Chapter 4.; 4.1; the first two paragraphs of 4.2; and Fig. 11.
Kawase K, et al: “Arrayed Silicon Prism Coupler for a Terahertz-Wave Parametric Oscillator”; Applied Optics; vol. 40, No. 9, Mar. 20, 2001, pp. 1423-1426.
Yarborough, et al: “Efficient, Tunable Optical Emission from LiNbO3, without a Resonator”; Applied Physics Letters; vol. 15, No. 3, pp. 102-105, Aug. 1, 1969.
Kawase, et al: “Coherent Tunable THz-Wave Generation from LiNbO3with Monolithic Grating Coupler; Applied Physics Letters 68 (18), Apr. 29, 1996, pp. 2483-2485.

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