Speaker
Description
Precise measurements of weak laser power are necessary, while few methods can meet this requirement. To realize the measurement of weak laser power down to microwatt and nanowatt, we adopt an atomic clock to measure the laser power, which is traceable to the output frequency of the atomic clock. A 795 nm semiconductor laser and a Rb atomic clock are utilized. The laser is incident into the cell of the rubidium clock and the frequency of atomic clock varies with the laser power. The affect of 795 nm laser power, wavelength on frequency of Rb atomic clock is analyzed. The experimental results show that the output frequency of Rb clock changes with the laser wavelength and power. At a wavelength of 794.99 nm, 2 μW laser power leads to a frequency shift of 0.13 mHz@10MHz, and the frequency shift of the atomic clock increases with the laser power increasing.
In summary, a novel method to measure the weak laser power is proposed. The experiment is carried out to realize the quantum measurement of weak laser power. It provides a new way to trace laser power to atomic frequency. Moreover, the experimental setup can be further improved to stabilize laser power.
