Wavelength stabilized diode laser

A device for generating a laser emission having a stable wavelength, the device comprising:

• a semiconductor gain section having a light emission of a known non-lasing peak wavelength and a known spectral width, said semiconductor gain section comprising:
• a rear facet having a first reflectivity;
• and
• a front facet having a second reflectivity, said rear facet and said front facet forming a first resonant cavity having a first plurality of resonances within the spectral width of the light emission of said semiconductor gain section,
• an optics section collecting and collimating said light emission;
• a volume Bragg grating, having a known reflectivity, said volume Bragg grating:
• receiving said collected and collimated light emission, and
• reflecting a portion of the received collected and collimated light emission back into the semiconductor gain section, wherein the rear facet of the semiconductor gain section and the volume Bragg grating form a second resonant cavity with a second plurality of resonant wavelengths, and
• a discrete etalon element positioned between said semiconductor gain section and said volume Bragg grating, said etalon element comprising:
• a front optical surface;
• and
• a rear optical surface, each of said front and rear optical surfaces coated with partially reflective coatings, said reflective coatings determining allowed resonances of the discrete etalon;
• wherein one of said first plurality of resonances, one of said second plurality of resonant wavelengths and one of said allowed resonances is substantially coincident and said laser emission is emitted at said substantially coincident wavelength when a sum of a reflected portion of the collected and collimated light emission from the volume Bragg grating and a reflected portion of the light emission reflected by the front facet provide sufficient feedback to support the laser emission.