Compact self-aligned external cavity lasers using volume gratings

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High power laser diode bars have a broad multimode spectrum of several nanometers consisting of the superposition of the spectrum of each broad area emitter in the bar. With external feedback from a single reflective VHG, the broad spectrum of a laser diode bar is wavelength narrowed to a bandwidth equal to the bandwidth of the VHG [1,2,3], which is typically of the order of a couple of tenth of nanometers.