Research on optical locking hardware system for miniaturized narrow linewidth laser
The development of a miniaturized,digital,and high-bandwidth optical phase-locked control system is the key to realizing miniaturized narrow linewidth laser light sources for practical applications.However,current general-pur-pose and special-purpose systems have problems such as relying on commercial platforms,insufficient bandwidth,and low integration.The digital servo system developed is based on field programmable gate array(FPGA)and high-speed analog-to-digital converter(ADC)and digital-to-analog converter(DAC)to implement digital synthesizer,modulator,phase detector,filter and servo Control unit,successfully developed a high-speed,reconfigurable,dual-channel optical phase-locked loop integrated hardware platform,with a system open-loop bandwidth of 2.63MHz.Combined with the whispering gallery mode(WGM)optical microcavity with high quality factor characteristics,a narrow linewidth laser with an integral linewidth of 20Hz is achieved through the phase modulation optical heterodyne frequency stabilization method(PDH),and the optical closed-loop feedback bandwidth reaches 450kHz.The system has good versatility and scalability,and can be applied to servo locking of various atomic and molecular spectra and optical frequencies.
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