Abstract
The characteristics of the LDA operating in the steady state are analyzed. The carrier density, oscillating frequency, photon density compared to those in free-running state operating in the in-phase mode are analyzed. In this paper, linewidth narrowing and wavelength stabilization of a high-power laser diode array are obtained by using an external cavity consisting of Volume Bragg Grating (VBG) with the reflectivity of 15 %. At the driven current up to 40 A, an output power of 28 W is obtained with the linewidth down to 0.3 nm, which corresponds to the efficiency of 93.3% compared to the output power in free-running LDA. The intensity of the external-cavity LDA is improved by a factor of approximately 3.3, and the wavelength is stabilized at 808nm determined by the VBG. This kind of laser diode array has potential applications in pumping solid-state lasers, medical treatment and gas sensing.
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