Patent ID: 8045594

Claim:
A surface-emitting external cavity laser device with intracavity frequency conversion comprising: at least one surface-emitting laser element with multiple layers, comprising at least one gain layer and a reflective layer arranged to obtain laser light at a fundamental frequency; reflector means, spaced from the surface-emitting laser element to form an external cavity; a frequency conversion device, arranged within the external cavity to generate light at a second frequency different from the fundamental frequency, the frequency conversion device comprising a first element and a second element spaced apart on an optical axis of the laser element, the first and second elements having opposing surfaces provided with a coating; and tunable optical band-pass filter means integrally formed with the frequency conversion device, arranged within the external cavity, wherein the band-pass filter means are tunable by varying a distance between the opposing surface of the first and second elements based upon a signal generated by detector means.