Absorption resonant rare earth-doped micro-cavities

Details Absorption resonant rare earth-doped micro-cavities Absorption resonant rare earth-doped micro-cavities

H - Electricity

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H01S 3/06 (2006.01) C09K 11/00 (2006.01) G21K 1/00 (2006.01) H01S 3/063 (2006.01) H01S 3/0941 (2006.01) H01S 3/16 (2006.01) H01S 3/17 (2006.01) H01S 5/04 (2006.01)

Patent

CA 2127614

-14- ABSORPTION RESONANT RARE EARTH-DOPED MICRO-CAVITIES Abstract Absorption properties of an optically active medium can be changed drastically by a Fabry-Perot microcavity. Optically active medium of the cavity includes a host material which is not optically active and at least one rare earth ion which provides optical activity to the medium. The Fabry-Perot cavity is designed to be resonant with excitation wavelength of an absorption band of the host material. The excitation is provided by a source of radiation positioned such that the radiation impinges on the cavity at an angle within a range of from zero to less than 90 degrees from the normal to the top surface of the cavity. In one embodiment Er- implanted SiO2 is used as the optically active medium. SiO2:Er has an absorptionband at 980 nm and an emission band at 1.55 µm due to 4f intra-atomic transitions of Er3+ ions. The Fabry-Perot cavity is designed to be resonant with the 980 nm absorption band of SiO2:Er. The efficiency of the cavity structure is much higher as compared to a no-cavity structure, while the spectral features of the active SiO2:Er emission are unaltered. The structure can be used for optically pumped semiconductor devices, such as optical amplifiers or lasers, which could be operated with a higher overall efficiency.

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