I’m new to lasers and need some help with a couple of terms.

TTL Modulation, does this only turn on and off the laser, or does it vary the intensity of the laser also?

Analog Modulation, does this only turn on and off the laser, or does it vary the intensity of the laser also?

The unit I purchased only has power through the PS, so applying power to the PS turns the laser on and removing power turns the power off. From what I have read applying full power in this manner grately reduces the life of the laser, is this correct?

Thanks

HH