Light emitting device for visual applications
AssigneeEpiCrystals Oy
InventorsJanne Konttinen, Pietari Tuomisto, Tomi Jouhti
Life of this patent
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Abstract
A light emitting device comprises a waveguide having an electrically pumped gain region, a nonlinear medium, and an inclined mirror. Light pulses emitted from the gain region are reflected by the inclined mirror into the nonlinear medium in order to generate frequency-doubled light pulses. The gain region and the inclined mirror are implemented on the same substrate. The resulting structure is stable and compact, and allows on-wafer testing of produced emitters. The folded structure allows easy alignment of the nonlinear crystal.
Claims20
A light emitting device comprising:
- a waveguide having an electrically pumped gain region,
- a saturable absorber,
- a reflecting structure,
- a substrate, and
- a nonlinear medium,
- wherein said saturable absorber and said gain region are adapted to emit first light pulses from an end of said waveguide, said reflecting structure being adapted to reflect said first light pulses into said nonlinear medium, said nonlinear medium being adapted to generate second light pulses such that the optical frequency of said second light pulses is two times the optical frequency of said first light pulses;
- said gain region, said saturable absorber and said reflecting structure being implemented on said substrate such that said reflecting structure is adapted to change the direction of said first light pulses by an angle which is in the range of 70 to 110 degrees.
A method for generating light pulses by using a waveguide having an electrically pumped gain region, a saturable absorber, a reflecting structure, a substrate, and a nonlinear medium, said gain region, said saturable absorber and said reflecting structure being implemented on said substrate, said method comprising:
- providing first light pulses from an end of said waveguide by using said saturable absorber and said gain region,
- changing the direction of said first light pulses by an angle which is in the range of 70 to 110 degrees by said reflecting structure, and
- coupling said first light pulses into said nonlinear medium in order to generate second light pulses such that the optical frequency of said second light pulses is two times the optical frequency of said first light pulses.
A projecting device comprising:
- a light source, and
- projecting optics,
- said light source in turn comprising
- a waveguide having an electrically pumped gain region,
- a saturable absorber,
- a reflecting structure,
- a substrate, and
- a nonlinear medium,
- wherein said saturable absorber and said gain region are adapted to emit first light pulses from an end of said waveguide, said reflecting structure being adapted to reflect said first light pulses into said nonlinear medium, said nonlinear medium being adapted to generate second light pulses such that the optical frequency of said second light pulses is two times the optical frequency of said first light pulses;
- said gain region, said saturable absorber and said reflecting structure being implemented on said substrate such that said reflecting structure is adapted to change the direction of said first light pulses by an angle which is in the range of 70 to 110 degrees.
Dependencies are inferred from the claim text.