Coherent properties and fine tuning of two FBG-based external cavity diode lasers were investigated. The external cavity length of each laser was as short as 1 0 mm. The linewidth was measured to be as narrow as several tens of kHz*mW and side mode suppression ratio of 30 dB was obtained. The tuning rate was measured to be 1 MHzJmA that is three orders ofmagnitude less than typical value of injection lasers. The operating regime, in which tuning rate equals to zero, was observed. This fact makes FBG-based external cavity diode lasers very attractive for fine interferometric applications.
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