Narrow linewidth diode lasers for narrow Ba+ ion transitions

Precision measurements on atomic parity violation (APV) can be conducted using narrow optical transitions in the Ba+ ion. Narrow linewidth lasers are essential for the success of such experiments. For this purpose we use a Pound-Drever-Hall locking scheme for stabilizing the frequency of a diode laser to a Fabry Perot cavity. An importan role plays the electronics employed for fast feedback. We have explored two viable, a FET controlled fast current bypass and a bias-T configuration. Laser frequency drifts at slow time scales are compensated by stabilizing an optical using light from an optical frequency comb. The laser linewidth could be reduced to 10 kHz, which is sufficient to measure APV