The Ruby Laser (694 nm): A Classic Wavelength in Pigment Work

The ruby laser (694 nm) is one of medical lasers’ elders. The wavelength sits in a high melanin-absorption band (stronger than 755 nm) with relatively shallow penetration, historically a key wavelength for superficial pigment and green tattoos. Modern derivatives Q-switch and fractionate it, keeping a niche for low-risk pigment handling and texture in some markets.

Ruby is now niche: multi-wavelength Q-switched/picosecond platforms (532/755/1064) cover most of its territory with easier maintenance. Remaining advantages: green tattoos (694 nm handles green well) and fine superficial pigment work. Buying advice: unless specializing in tattoo removal with steady volume, standard clinics should run multi-wavelength platforms (Q-switched, picosecond).

• Very high melanin absorption means the highest PIH risk among short wavelengths — 694 nm on darker skin demands extra conservatism.
• Legacy ruby systems face scarce parts; used purchases carry high risk (see new vs used).

Why are green tattoos hard?

Green ink’s absorption band misses the mainstream wavelengths (532/1064) — 694/755 nm are among the most effective for green, which is exactly where ruby and alexandrite keep their niche.

Can you still buy new ruby systems?

A few vendors persist; most modern platforms approximate the band with 755 nm alexandrite stacks — the route has largely been superseded.

• Q-Switched
• Tattoo Removal
• 755 nm