Chirped-comb generation has been observed in an external-cavity laser diode with a grazing-incidence grating and an intracavity acousto-optic frequency shifter. In contrast to the previous works in which the ratio of the intracavity frequency shift to the cavity free spectral range is much smaller than unity, our experiment was performed for a wide range of the ratio from 0.21 to 1.4. (C) 1998 Elsevier Science B.V. All rights reserved.