Figure 5

Transmitted intensity of probe versus reference laser detuning. The plot shows the intensity of transmitted 780 nm probe light from the cavity versus wavemeter reading reference laser frequency. In this measurement, the cavity is locked to the reference laser, and the transmission of the probe is measured for various detunings of the reference laser for approximately two seconds. Each black dot represents the mean and the error bar is the standard deviation of the transmitted intensity at a given detuning. The value of the error bar is observed to increase near zero detuning. This is because of the Lorentzian nature of the transmission of light through an FP cavity. The reference laser frequency is changed in steps and the intensity of the transmitted probe light is measured