Ten emitter dual-wavelength Y-branch DBR laser diode array emitting 1 W at 785 nm with a spectral emission width below 60 pm

We present a 5 mm wide ten emitter dual-wavelength Y-branch DBR laser diode array emitting at 785 nm with an output power of 1 W at both wavelengths. The two emission wavelengths are individually addressable. The emitters are spectrally stabilized by deeply etched 10th order Distributed Bragg Reflector (DBR) gratings, realized by e-beam lithography. The wavelengths at 1 W output power are 784.0 nm and 784.6 nm. The spectral width of the emission of the individual emitters is below 20 pm. The spectral width of the array at 1 W is less than 60 pm caused by a variation in emission wavelength of about 40 pm of the individual emitters operating at one wavelength. The ten individual emitters reach an optical output power of 100 mW with minor variation of only 5 mW.