Tunable, narrow-linewidth output from an injection-locked high-power AlGaAs laser diode array

An injection-locking technique has been employed to produce single-frequency tunable output from a high-power AlGaAs laser diode array. A narrow-linewidth external cavity laser is used as a master oscillator. With an injected power of 15 mW, a total output power of 1.0 W was obtained from the laser diode array with a spectral linewidth of less than 38 kHz, a wavelength tuning range of 13 nm, and a 0.67 degrees -wide single-lobed far-field beam.