Back to results
US 4,483,004 AGranted
Laser functional device
AssigneeTohoku University
InventorsHumio Inaba, Hiromasa Ito, Yoh Ogawa
Life of this patent
Estimating the term…
Abstract
A laser functional device formed by photoelectric direct loop coupling of a laser diode and a photodetector, the latter of which receives a part of an output light of the former together with an external input light and excites the former by an output current thereof, can be easily miniaturized and integrated as a fundamental function active device self-containing a light source and presenting various useful functions of the optoelectronic technology between the external input and the output lights.
Claims7
An optoelectronic laser device for carrying out a desired function, said device comprising:
- a laser emitting element for emitting a coherent light in response to an exciting electric current that is in excess of the threshold current of the laser emitting element, and
- a photoelectric converting element for converting at least a part of said coherent light emitted by said laser emitting element to an electric current;
- means for optically and electrically connecting said laser emitting element and said photoelectric converting element in a photoelectric loop for accomplishing positive feedback excitation between said laser emitting element and said photoelectric converting element under which said electric current is added in phase to said exciting electric current to the point of saturation of said photoelectric converting element, said light-emitting element providing a light output operative in accordance with a desired function.
Dependencies are inferred from the claim text.