Laserluchs IR-illuminators are used to improve the performance of night vision devices. If there is too little ambient light from the moon, stars, etc the use of a Laserluchs artificially brightens and significantly improves the effective performance of night vision devices.
No, Laserluchs IR-illuminators are working in the infrared waveband of light and are virtually invisible to the human eye.
No, conventional binoculars do not have an image intensifier tube that can "see" IR-light.
This is highly dependent on the performance of your night vision device, the environment you are using it in as well as other factors.