研究目的
To aid in the development of next-generation low SWaP Coherent Population Trapping (CPT) clocks by developing a CubeSat Atomic Clock Testbed (CuSACT) and comparing direct injection-current modulation of a VCSEL with electro-optic phase modulation of the VCSEL.
研究成果
The testbed will be used to study the effect of sideband asymmetry on light shift and overall clock stability. Tradeoffs in clock design and performance will be analyzed to form recommendations on modulation method decisions for compact clock development in CubeSat applications based on SWaP reduction paths and performance characteristics.
研究不足
The testbed's current puzzle remains regarding the behavior of the CPT resonances with asymmetric sidebands and laser frequency detuning. This may be related to the temperature and buffer gas pressure properties in the cell.
1：Experimental Design and Method Selection:
The testbed setup is reconfigurable to accommodate various modes of operation and the recording of optical spectra. It can also be operated as a clock to measure light shifts and other CPT frequency shifts. The block diagram shows the laser light of a VCSEL externally modulated at
2：417 GHz by an EOM, which can be bypassed when the VCSEL is directly modulated. Sample Selection and Data Sources:
The transmitted light is detected with a silicon photodiode, and passed to feedback controls for laser and RF stabilization in the operational clock mode of the testbed.
3：List of Experimental Equipment and Materials:
VCSEL, EOM, scanning Fabry-Perot etalon, silicon photodiode, rubidium absorption cell.
4：Experimental Procedures and Operational Workflow:
The testbed is used to study the effect of sideband asymmetry on light shift and overall clock stability.
5：Data Analysis Methods:
The conditions under consideration are modulation-induced sideband asymmetry on the CPT resonance lineshapes and clock frequency shifts (and light shift) due to RF power/asymmetry conditions.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
