Yanguang Sun, Min Xu, Yaqing Chen, Rui Wu, Youzhen Gui, Nan Chen, Kang Ying, Fei Yang, Haiwen Cai. Research Progress on Free-Space Laser Time-Frequency Transfer[J]. Laser & Optoelectronics Progress, 2020, 57(17): 170004
- Laser & Optoelectronics Progress
- Vol. 57, Issue 17, 170004 (2020)
![Experimental setup of free-space laser time and frequency transfer of Germany[12]](/Images/highlights-null.jpg)
Fig. 1. Experimental setup of free-space laser time and frequency transfer of Germany[12]
Fig. 2. Experimental setup of free-space laser time and frequency transfer of France[13]
![Experimental setup of optical frequency comb based free-space laser time-frequency transfer of USA[14]](/Images/icon/loading.gif){kind=icon}
Fig. 3. Experimental setup of optical frequency comb based free-space laser time-frequency transfer of USA[14]
Fig. 4. Optical clock comparison based on optical two-direction time-frequency transfer[11]. (a) Schematic of free-space optical clock comparison based on frequency comb and LOS; (b) schematic of LOS
Fig. 5. Schematic of free-space optical clock synchronization based on optical frequency comb[19]
Fig. 6. Schematic of free-space optical clock synchronization based on optical frequency comb[17]. (a) Pyramid on rail; (b) retro-reflector on quadcopter
Fig. 7. Schematic of time frequency comparison of LTT[33]
Fig. 8. Schematic of clock comparison of T2L2 and configuration of ground station and space payload[35]. (a) Schematic of satellite-ground time clock comparison of T2L2; (b) configuration of ground station; (c) configuration of space payload
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Table 1. Comparison of performance of free-space laser time-frequency transmission obtained by research units
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