Abstract:
PROBLEM TO BE SOLVED: To provide an improved edge emission type semiconductor laser capable of moderating heat generation by non-emissive re-coupling in a side facet of a semiconductor laser in an active layer. SOLUTION: In this edge emission type semiconductor laser, a second waveguide layer 2 adjoins a second mantle layer 5, and the active layer is not embedded in the second waveguide layer. The second waveguide layer 2 is optically coupled to a first waveguide layer 1 at least in partial regions 10 and 11. In addition, a third mantle layer 6 is arranged on the side of the second waveguide layer 2 opposite to the waveguide layer 1. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an improved edge emission semiconductor laser in which heat generation due to nonradiative recombination in the side facet of the semiconductor laser is relaxed.SOLUTION: In the edge emission semiconductor laser, a plurality of contact surfaces 8a, 8b, and 8c are attached, at a periodic interval, onto a partial region of the semiconductor laser used for electrical pumping of an active layer forming a laser beam 13. The periodic interval is equal to two times of the transition length Lc, the transition length Lc is the interval of a maximum strength and an adjoining minimum strength in one of waveguide layers 1, 2. The midpoints of the contact surfaces 8a, 8c adjoining the side facet 9 are separated, respectively, therefrom by the transition length.
Abstract:
The invention relates to a semiconductor laser device comprising an optically pumped surface-emitting vertical emitter (1) which emits in a vertical main radiating direction, and at least one monolithically integrated pumping radiation source (2) for optically pumping the vertical emitter (1), the pumping radiation source emitting pumping radiation that extends transversal to the vertical main radiating direction. According to a first embodiment, the inventive semiconductor laser device is characterized in that at least one vertical section of the pumping radiation source (2) is configured so as to be index-guiding for pumping radiation in a lateral direction perpendicular to the main direction of pumping radiation and perpendicular to the vertical main radiating direction. In a second embodiment, the semiconductor laser device is characterized in that the pumping radiation source (2) has a smaller width in a lateral direction perpendicular to the main direction of pumping radiation in at least one vertical section than in another vertical section. If the dimensions are adequate, modes of the pumping radiation can thus be entirely or at least partly displaced from said section in a vertical direction, resulting in a reduction of absorption losses of the pumping radiation on conducting layers.
Abstract:
The invention relates to a thin-film light-emitting diode chip in which the distance between a reflective layer (4) and a light-generating active zone (3) is such that radiation from the active zone (3) interferes with light reflected by the reflective layer (4). The interference affects the internal quantum efficiency of the active zone (3), and consequently the active zone has an emission characteristic with at least one preferred direction.
Abstract:
The invention specifies an edge-emitting semiconductor laser chip having - an active zone (14) in which electromagnetic radiation is produced during operation of the semiconductor laser chip (1) and - at least one structured contact strip (2) which is structured in such a manner that charge carrier injection into the active zone (14) decreases towards a side of the semiconductor laser chip (1) on which a coupling-out facet (3) of the semiconductor laser chip (1) is situated.
Abstract:
The invention relates to a radiation-emitting semiconductor chip (1) that emits polarized light using the Purcell effect. Such a semiconductor (1) emitting polarized radiation comprises a radiation-generating active zone (3) and a polarizing filter (5). The radiation-generating active zone (3) is arranged between a radiation-extracting surface of the semiconductor chip (1) and the polarizing filter (5).
Abstract:
An edge-centering semiconductor laser is provided, comprising a semiconductor body (1) having a wave guide area (2). The wave guide area (2) comprises a lower cover layer (3a), a lower wave guide layer (4a), an active layer (5) for generating laser radiation, an upper wave guide layer (4b) and an upper cover layer (3b). The wave guide area (2) also comprises at least one structured laser radiation scattering area (6) in which a lateral base laser radiation mode experiences less scattering losses than the radiation of higher laser modes.
Abstract:
The invention relates to a luminescent diode (1) comprising an active area (7) which emits electromagnetic radiation in the direction of the main radiation (15). The active area (7) in the direction of the main radiation (15) is arranged downstream from a reflection-reducing layer sequence (16). Said reflection-reducing layer sequence contains a DBR mirror which is formed from at least one pair of layers (11, 12), a reflection coating (9) which is arranged downstream from the DBR-mirror (13) in the direction of the main radiation (15) and an intermediate layer (14) which is arranged between the DBR-mirror (13) and the reflection coating (9).
Abstract:
The invention relates to a semiconductor device comprising an optically pumped vertical emitter that is provided with an active vertical emitter layer (3) and a pumping radiation source by means of which a pumping radiation field is generated that propagates in a lateral direction while optically pumping the vertical emitter layer (3) in a pumping zone, the wavelength of the pumping radiation field being smaller than the wavelength of the radiation field (12) generated by the vertical emitter. The pumping radiation source encompasses an active pumping layer (2) that is disposed downstream of the vertical emitter layer (3) in a vertical direction and at least partly overlaps with the vertical emitter layer from a vertical perspective. The active pumping layer (2) is arranged in such a way that the pumping radiation field generated during operation is more powerful than a parasitic, laterally propagating radiation field generated by the vertical emitter layer (3). Alternatively, a parasitic, laterally propagating radiation field is prevented from being generated by the vertical emitter layer (3).