To amplify dye laser intensity, injection locking of a 0.5W broad area laser (BAL) diode at 670.9nm was studied. The threshold current of BAL was dropped by the injection locking. Almost 90% of the total output power was able to be put in a single transverse mode. The spectral profile of injected BAL was almost the same as that of the master dye laser. The linewidth was determined to be less than 400kHz by beat-note spectrum between the master dye laser and the slave BAL. At the maximum gain of 20, the maximum output of 105mW was obtained for an injected power of 5mW and an injected current of 700mA. The locking bandwidths were 17GHz for gain 10 and 13GHz for gain 20. Compared with the conventional method to increase the dye laser intensity, where the pumping Ar+ laser power is increased, this method is quite effective with the lower energy consumption (<1/3800), with the lower cost (<1/4) and with the higher output power (>×2).
