Acompact iodine-stabilized solid-state laser at 532 nm

Although the traditional iodine-stabilized 532 nm optical frequency standard is high frequency stability and uncertainty, it is complex and not portable. Lower frequency stability is acceptable in some cases such as absolute gravimeters, on which smaller size and portable are focused. A compact iodine-stabilized solid-state laser at 532 nm is established, which is portable for its small size. By the way of measuring the frequency beat with the original iodine-stabilized 532 nm optical frequency standard, the Allan deviation is 2.4×10^-12 for 1 s averaging time, and the absolute frequency of the laser is 563260223436 kHz, whose uncertainty is 52 kHz (coverage factor k=2). The system has been applied to absolute gravimeters at National Institute of Metrology.