Vertical external cavity surface emitting laser with improved external mirror structure
A vertical surface emitting laser (VECSEL) device 10 has a gain structure 12 comprising a first mirror 18 (for example, a Bragg mirror DBR) and an active layer 20 (or optical gain layer); and an external mirror structure 14 spaced apart from the gain structure lo define an external cavity. The exter...
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| Zusammenfassung: | A vertical surface emitting laser (VECSEL) device 10 has a gain structure 12 comprising a first mirror 18 (for example, a Bragg mirror DBR) and an active layer 20 (or optical gain layer); and an external mirror structure 14 spaced apart from the gain structure lo define an external cavity. The external mirror 14 structure may comprise a sub-wavelength high contrast grating (HCG) and a reduced-layer distributed Bragg mirror (DBR) provided together on a flat multi-layer chip. The HCG may have a grating period smaller than a target laser emission wavelength of the laser device. The combined HCG-DBR may facilitate polarization selectivity, which improves the quality of the laser light emitted by the VECSEL. |
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