Abstract
We proposed a novel wavelength-spread compression technique for
spectral beam combining of a diode laser array. A reflector, which is
parallel to the grating, is introduced to achieve a double pass with a
single grating. This facilitated the reduction of the wavelength spread by
half and doubled the number of combined elements in the gain range of the
diode laser. We achieved a power of 26.1 W under continuous wave operation
using a 19 element single bar with a wavelength spread of 6.3 nm, which is
nearly half of the original wavelength spread of 14.2 nm, demonstrating
the double-compressed spectrum capability of this structure. The spectral
beam combining efficiency was 63.7%. The grating efficiency and reflector
reflectance were both over 95%; hence, the efficiency loss of the
double-pass grating with a reflector is acceptable. In contrast to
double-grating methods, the proposed method introduces a reflector that
efficiently uses the single grating and shows significant potential for a
more efficient spectral beam combining of diode laser arrays.
© 2018 Chinese Laser Press
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