Fig. 1. Principle of transfer oscillator

Fig. 2. System setup diagram of the transfer oscillator

Fig. 3. Results of single transfer oscillator system. (a) Counting result of f_e; (b) Allen variance curve of f_e; (c) line width of the beat note between master and slave laser; (d) phase noise of f_e

Fig. 4. Schematic diagram of dual transfer oscillator system

Fig. 5. Results of dual transfer oscillator system. (a) Counting result of beat note between master and slave laser; (b) Allen variance curve of beat note between master and slave laser; (c) FFT spectrum of the beat note between master laser and slave laser; (d) phase noise power spectrum

Fig. 6. Measuring results of beat note between slave lasers after offset frequency locking. (a) Counting result; (b) phase noise

Fig. 7. Allen variance curve of beat note between two slave lasers in different conditions