What type of laser operates within the 400-1000 nm range?

The correct choice is IPL (Intense Pulsed Light) because this technology utilizes a broad spectrum of light, typically emitted in pulses, across a range that includes wavelengths from approximately 400 nm to 1000 nm. IPL systems can target various skin conditions and hair removal due to this wide range, making them versatile for different treatments.

In comparison, CO2 lasers primarily operate at longer wavelengths, typically around 10,600 nm, which is well outside the specified range. The Nd:YAG laser operates at a wavelength of 1064 nm, which, while within the bounds of the category, does not address the broader context of this question as the focus is specifically on the range of 400-1000 nm and the nature of emission (continuous wave versus pulsed). The diode laser, depending on its configuration, usually operates at wavelengths typically ranging from 800 nm to 980 nm, which again is primarily at the higher end of the asked range.

Thus, IPL’s characteristic of emitting light across that specific range ensures it is the most appropriate answer in this context.