Wang-Yau Cheng

Absolute frequency of cesium 6S-8S 822 nm two-photon transition by a high-resolution scheme.

We present an alternative scheme for determining the frequencies of cesium (Cs) atom 6S-8S Doppler-free transitions. With the use of a single electro-optical crystal, we simultaneously narrow the laser linewidth, lock the laser frequency, and resolve a narrow spectrum point by point. The error budget for this scheme is presented, and we prove that the transition frequency obtained from the Cs cell at room temperature and with one-layer μ-metal shielding is already very near that for the condition of zero collision and zero magnetic field. We point out that a sophisticated linewidth measurement could be a good guidance for choosing a suitable Cs cell for better frequency accuracy.

Absolute frequency of cesium atom 6S1/2-6D3/2 Doppler-free two-photon transition

We determined the absolute frequency of 133Cs 6S1/2-6D3/2 two-photon transition, our novel scheme enabled the resolution to address the nuclear magnetic octupole.

Absolute frequency of cesium 6S 1/2 –6D 3/2 hyperfine transition with a precision to nuclear magnetic octupole interaction

We have determined the fundamental frequency of the cesium atom 6S1/2-6D3/2 two-photon transition, for the first time, to our knowledge. Moreover, our high-resolution scheme made it possible to address the influence of the nuclear magnetic octupole on the hyperfine structure. We found that the octupole-interaction hyperfine constant deduced from the cesium 6D-level has a value nearly eight times larger than what has been deduced from the 6P-level.

Compact and Dual Ti:Sapphire comb lasers pumped by single fiber laser

We demonstrated two femtosecond Ti:sapphire comb laser pumped by a continuous-wave 532 nm light which is generated from a frequency doubling 1064 nm ytterbium fiber laser. To make the system small, we develop HS-CTSDL being the frequency standard.

Absolute frequencies of 133 Cs 6S 1/2 –8S 1/2 two-photon transition stabilized diode lasers

We report on our measured frequencies of cesium 6S–8S two-photon transitions. We also point out our finding on the influence of different cesium cells from different producer to the measured values of absolute frequency.

Cesium 6S 1/2 →8S 1/2 two photon-transition stabilized 822.5nm diode laser

We construct a frequency stabilized extended-cavity diode laser (ECDL) at 822.5 nm wavelength that could be a reliable frequency reference. The laser frequency is locked to the Cs 6S1/2rarr8S1/2 two-photon-transition (TPT) with the Allan deviation of 4.4times10-13 (60 s). The possible systematic error is evaluated as 2 kHz.