Injection laser
First Claim
1. An injection laser comprising at least one gain region having a longitudinal gain axis and outputting laser radiation at an outflow angle φ
- , said injection laser comprising;
a laser heterostructure comprising;
an active layer forming said at least one gain region;
cladding layers comprising at least one layer having a refractive index, and ohmic contacts; and
at least one radiation inflow region adjoining said laser heterostructure that is transparent to said laser radiation, has a refractive index nRIR, and is located on at least one side of said active layer, said radiation inflow region including at least one optical facet, an outer surface, and an inner surface, said optical facet being oriented at an angle of inclination ψ
with respect to a plane perpendicular to said longitudinal gain axis; and
reflectors that together form an optical resonator at least part of which coincides with at least part of said radiation inflow region and at least part of said gain region, wherein said laser heterostructure and said adjoining radiation inflow region together have an effective refractive index neff such that nRIR exceeds neff;
arccos(neff/nRIR)≦
arccos(neff-min/nRIR); and
neff-min is greater than nmin, where neff-min is the minimum value of neff for laser heterostructures with radiation inflow regions that produce outflow of radiation from the active layer into the radiation inflow region, and nmin is the smallest of the refractive indices in the cladding layers of the heterostructure.
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Abstract
An injection laser comprises a laser heterostructure, at least one radiation inflow region adjoining the laser heterostructure, and reflectors that together form an optical resonator. The laser heterostructure comprises an active layer, cladding layers, and ohmic contacts. The radiation inflow region adjoining the laser heterostructure is transparent to the laser radiation and is located on at least one side of the active layer. The radiation inflow region additionally includes at least one optical facet, an outer surface, and an inner surface. Radiation generated in the active layer flows into the radiation inflow region and exits the laser.
17 Citations
54 Claims
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1. An injection laser comprising at least one gain region having a longitudinal gain axis and outputting laser radiation at an outflow angle φ
- , said injection laser comprising;
a laser heterostructure comprising;
an active layer forming said at least one gain region;
cladding layers comprising at least one layer having a refractive index, and ohmic contacts; and
at least one radiation inflow region adjoining said laser heterostructure that is transparent to said laser radiation, has a refractive index nRIR, and is located on at least one side of said active layer, said radiation inflow region including at least one optical facet, an outer surface, and an inner surface, said optical facet being oriented at an angle of inclination ψ
with respect to a plane perpendicular to said longitudinal gain axis; and
reflectors that together form an optical resonator at least part of which coincides with at least part of said radiation inflow region and at least part of said gain region, wherein said laser heterostructure and said adjoining radiation inflow region together have an effective refractive index neff such that nRIR exceeds neff;
arccos(neff/nRIR)≦
arccos(neff-min/nRIR); and
neff-min is greater than nmin, where neff-min is the minimum value of neff for laser heterostructures with radiation inflow regions that produce outflow of radiation from the active layer into the radiation inflow region, and nmin is the smallest of the refractive indices in the cladding layers of the heterostructure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
- , said injection laser comprising;
Specification