Study Of Clock Transition Of The Atomic Ytterbium Frequency Standard

Optical lattice clock based on neutral atoms with high accuracy is regarded as one of the candidate of next generation frequency standard, and is widely studied in recent years. Not only it can be used to improve the precise measurement of fundamental physical constants, but also it can give technical support for navigation related to global positioning system. According to the present status of clock transition of Yb optical lattice clock, considering the energy level of Yb atoms, a new clock transition1S0â†'3P2is proposed and light field is realized in the thesis. The main results are outlined in the following:1. A home-made laser driver is realized. Considering the sharp electric pulse is harmful to laser diode, a power-cutoff protect circuit is designed. In order to be sure the merits of the laser driver, a laser diode at780nm is supplied with the driver and saturated-absorption spectrum is obtained to check the property of the circuit.2. To avoid the hurt to the laser diode by the counter-propagated light field, an28dB optical isolator is made.3. A simple second-harmonic generation(SHG) scheme is realized. Single pass frequency doubling with single lens coupling is gotten through the WG PPLN. Considering the property of the WG PPLN and complexity of the optical waist matching, a3-axis translation stage with resolution up to50nm and a visible microscope system with100-fold amplification are used. Optical waist of fundamental laser at1014before and after lens transformation is analyzed. After carefully adjustment,86.5μW output power at507nm is successfully obtained. SHG power as a function of WG PPLN temperature is also given. A frequency doubling process with traditional fiber coupling way with WG PPLN is compared in the thesis.