What s the frequency stability and frequency locking?
For the TLB-7000, the frequency drift is typically less than 1 pm over half a day (see page 27). For the TLB-6300 and TLB-6000, the frequency drift of the laser is less than 0.02 nm over an entire day, and less than 5 MHz over a 5-second interval. The laser can easily be locked either to an atomic line or to an external cavity using wavelength-modulation techniques to produce a feedback signal. Dither the laser frequency through the frequency-modulation input. The error signal generated can then be fed back to the laser through the drive current. Using this technique, wavelength drift can be dramatically reduced.
