The Pure Photonics lasers activate in standard dithermode, providing long-term stability, but with a persistent 200Hz dither signal (about 80MHz amplitude).
The user can reduce the amplitude of the dither signal once the device has stabilized by up to 75% by using the register 0x96. The value of this register is 2-8 and represents 25% – 100% of the original signal (in steps of 12.5%). On the PPCL600 (new firmware) there is also an option to automatically enable a lower dither amplitude upon startup.
This reduced dither option provides long term stability with a reduced 200Hz dither signal.