280mHz Linewidth DBR Fiber Laser Based on PDH Frequency Stabilization with Ultrastable Cavity

Ultrastablelow-noiseultranarrowlinewidthlaserlightsourcehasa widerangeofapplicationsin precisionmeasurement opticalatomicclock time-frequencytransmission andlow-noisemicrowavegeneration UltrastablecavityPound-Drever-Hall PDH frequencystabilizationtechnologyisoneofthemostimportantsolutions forobtainingsuchultrastablelasers Basedonthis thelinewidthofthedistributedfeedback DFB single-frequency fiberlaserhasreachedtheorderofmillihertz Inadditiontotheperformancesoftheultrastablecavityandservo system theavailablelinewidthandfrequencyinstabilityoftheultrastablefiberlaserdependontheperformancesof thelinewidth frequencydriftandnoiselevelofthefree-runningfiberlaser andthelaserfrequency-tuning mechanism AlthoughmanyresearchinstitutionsinChinahavedevelopedsingle-longitudinal-modefiberlaserswith frequency-tuningmechanismsandthelaserfrequencyhasbeenstabilizedwithinahundredkilohertzforalongtime bythesaturated-absorptionfrequencystabilizationtechnologybasedonfinetransitionspectrallinesofgasmolecules home-madesingle-frequencyfiberlaserhasnotbeenappliedtoultrastablecavity PDH frequencystabilization technologytoobtainsubhertz-linewidthultrastablefiberlasersource Therefore itisverynecessarytoinvestigate thePDHfrequencystabilizationwithsuchhome-madesingle-frequencyfiberlasers