Abstract
An alternative design was presented which employs a commercial laser diode array with an external grating-loaded cavity. This novel assemblage permitted advantageous single-mode wavelength tuning and simultaneous two-wavelength application. The dual-wavelength laser output was coaxial, facilitating fiber-delivery for diverse purposes. A gain-guided 10-strip phase-locked laser-diode array was utilized as the gain medium. At a uniform spectral separation of 3.52 nm, the wavelength of the two laser modes were tunable over a range of 1.3 nm. The desired power ratio of the two modes was simply achieved by regulating the injected current level. The far-field pattern was investigated to show that the output at each separate wavelength used dissimilar gain regions of diode array.