A 40W one-cm laser diode array was coupled to a .22NA 200micron diameter optical fiber,
using a compact monolithic 3-D waveguide based device, with 50% coupling efficiency. No
auxiliary optical elements were used between the array and the coupler, or between the
coupler and the optical fiber.
High-power laser diodes operating in the wavelength range of 640 to 675 nm are described. Using a strained-layer, single quantum well, epitaxial structure in conjunction with oxide-stripe construction, CW power outputs of individual diodes in excess of 1 watt at 670 nm and over 450 mW at 640 nm have been achieved. These accomplishments were made possible by reducing the room temperature CW threshold current density to slightly over 300 A/sq cm at 670 nm and 560 A/sq cm at 640 nm. Measurements have also been made of spectral output, characteristic temperature, far-field intensity, operating lifetime, and internal laser parameters.
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