Surface emitting laser incorporating third reflector

摘要

Surface emitting laser structures that include a partially reflecting element disposed in the laser optical cavity are disclosed. A vertical external cavity surface emitting laser (VECSEL) structure includes a pump source configured to emit radiation at a pump wavelength, λpump, an external out-coupling reflector, a distributed Bragg reflector (DBR,) and an active region arranged between the DBR and the out-coupling reflector. The active region is configured to emit radiation at a lasing wavelength, λlase. The VECSEL structure also includes partially reflecting element (PRE) arranged between the gain element and the external out-coupling reflector. The PRE has reflectivity of between about 30% and about 70% for the radiation at the lasing wavelength and reflectivity of between about 30% and about 70% for the radiation at the pump wavelength.

主权项

1. A vertical external cavity surface emitting laser (VECSEL) structure, comprising:
an external out-coupling reflector; a distributed Bragg reflector (DBR); and a III-N heterostructure epitaxially grown on a GaN substrate and comprising:
an active region arranged between the DBR and the out-coupling reflector, the active region configured to emit radiation at a lasing wavelength, λlase in response to pump radiation emitted from a pump source and having pump wavelength, λpump; anda partially reflecting element (PRE) comprising alternating epitaxial layer pairs, including a first layer of AlGaN, InAlN, or InAlGaN and a second layer of GaN or InAlGaN, the partially reflective element arranged between the active region and the external out-coupling reflector, the partially reflecting element having reflectivity of between about 30% and about 70% for radiation at the lasing wavelength and reflectivity of between about 30% and about 70% for radiation at the pump wavelength.