Interference-Filter-Type External-Cavity Diode Laser with a Narrow Linewidth of 6 kHz
This article describes a 1397 nm narrow-linewidth-filter-type external-cavity semiconductor laser(IF-ECDL)suitable for spaceborne strontium clock ultra-stable laser sources.Effective suppression of technical noise,such as mechanical vibration and temperature fluctuations during laser operation,has been achieved by designing an integrated laser configuration and using an invar-based external cavity.The linewidth of the proposed 1397 nm laser is measured as approximately 6 kHz,which is close to the linewidth limit determined by the current source noise of the laser.It is the narrowest linewidth of discrete-device-type ECDLs reported heretofore.In addition,the laser can output optical power higher than 60 mW and provide a mode-hop-free frequency tuning range of more than 11 GHz with only piezoelectric transducer(PZT)scanning.Furthermore,it has quite high power and frequency stability.In addition to satellite-borne optical clock applications,this laser is also expected to become an ideal light source for the fields of precision measurement,quantum physics,and other applications that require narrow-linewidth laser light sources.
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