According to another aspect of the present disclosed technology, a diode laser assembly, includes an optical fiber having a cladding and a large mode area (LMA) core, wherein the LMA core comprises a fiber Bragg grating disposed within the LMA core, a plurality of diode lasers configured to emit light, optics configured to receive the light and to couple the light into the LMA core, and one or more features in the optical fiber to couple higher order modes of the light leaving substantially single mode light to propagate in the LMA core wherein a portion of the single mode light propagating in the LMA core is reflected by the fiber Bragg grating and is coupled back through the optics into the plurality of diode lasers to lock the wavelength of light emitted from each diode laser of the plurality.