Laser diode bar (LDB) are used increasingly often for many applications, but spectral bandwidth of LDB are generally
approximately 2-4nm, far too wide for many demanding applications, e.g. spin-exchange optical pumping, terahertz
generation, and lidar. External-cavity feedback can improve the spectral properties of LD or LDB. However, spectrum
narrowing of LDB is more difficult than that of LD. Bar curvature (i.e. "smile") produced in the manufacturing process
affects the spectrum narrowing greatly. By geometrical optics approach and ORIGIN software, smile which can be
corrected by plano-convex cylindrical lens is simulated and the result is in good agreement with experiment. The
selection of grating which is also a critical factor of spectrum narrowing will be stated. Finally, an external cavity
consisting of fast axis collimator, two plano-convex cylindrical lens and a diffraction grating is used. The scheme is
implemented on a 19-element LDB and yields 3-fold reduction in spectral linewidth under the situation that all optical
elements in the system which are not optimized. Further, we use a slit in the experiment and analyze the spectrum
narrowing of each element in LDB.
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