Single-channel injection locking of a diode-laser array with a cw dye laser

Hohimer, J. P.; Owyoung, A.; Hadley, G. R.
December 1985
Applied Physics Letters;12/15/1985, Vol. 47 Issue 12, p1244
Academic Journal
We report injection-locking studies on a gain-guided diode-laser array using a single-frequency cw tunable dye laser master oscillator. By injecting a single end element, both the spatial and spectral emission characteristics of the entire ten-element array could be controlled. The injection-locked array produced over 100 mW output in a single-lobed far-field beam (< 0.5° angular width) with a bandwidth of less than 2 MHz. With 3 mW injection, locking occurred over a number of discrete frequency intervals (∼ 6 GHz wide). At higher power levels (12 mW), these intervals merged to form one continuous locking range > 60 GHz wide. Furthermore, by varying the injection frequency, the far-field emission angle of the array could be continuously scanned over several degrees at a rate of 2.3 × 10[sup -2] deg/GHz.


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