Both PicoPlus and Spectra XT are produced by Lutronic Corporation. Both lasers use the same 660nm wavelength in the Ruvy Touch treatments.
The difference is that PicoPlus laser is both a Picosecond Laser and Nanosecond laser whereas Spectra XT is a Nanosecond laser.
Hence, Ruvy Touch in the PicoPlus laser is performed with ultrashort picosecond pulses instead of nanosecond pulses. Picosecond pulses are 100x shorter than nanosecond pulses which makes the treatment safer because of less heat production, inflammation and collateral damage to surrounding tissues.