OPTICALLY PUMPED SURFACE EMITTING LASERS INCORPORATING HIGH REFLECTIVITY/BANDWIDTH LIMITED REFLECTOR

摘要

PROBLEM TO BE SOLVED: To provide optically pumped laser structures incorporating reflectors that have high reflectivity and are reflectivity bandwidth-limited to a relatively narrow band around the central laser radiation wavelength.SOLUTION: A laser structure comprises: a semiconductor gain region configured to emit radiation at a central laser wavelength; a pump light source configured to emit a pump radiation beam at a central pump wavelength directed toward the gain region; a first reflector comprising a distributed Bragg reflector disposed in the pump radiation beam; and a second reflector disposed such that the gain region is interposed between the first and second reflectors. The first reflector has reflectivity greater than about 90% across a bandwidth of less than about 60 nm centered at the central laser wavelength, the first reflector also having a reflectivity less than about 50% at the central pump wavelength. Optionally, the Bragg reflector can be a 3/4-wavelength distributed Bragg reflector.