KTP laser treatment

Author: Anoma Ranaweera B.V.Sc; PhD (Clinical Biochemistry, University of Liverpool, UK), July 2014.

What is a laser?

The term LASER stands for light amplification by stimulated emission of radiation. Lasers produce an intense beam of light of a particular colour and wavelength which can be varied in its intensity and pulse duration.

Lasers can be used for the treatment of various dermatological conditions depending on the wavelength, pulse characteristics, and fluence (energy output) of the laser.

A variety of lasers are available; they are differentiated by the medium that produces the laser beam and the wavelength generated.

What is a KTP laser?

A KTP laser is a solid-state laser that uses a potassium titanyl phosphate (KTP) crystal as its frequencing doubling device. The KTP crystal is engaged by a beam generated by a neodynium:yitrium aluminium garnet (Nd: YAG) laser. This is directed through the KTP crystal to produce a beam in the green visible spectrum with a wavelength of 532 nm.

How does a KTP laser work?

What is KTP laser used for?

The following skin disorders may be treated with KTP lasers using an US Federal Drug Agency (FDA)-approved machine, such as The Excel V® (Cutera). The Revlite SI (ConBio) is a Q-switched KTP laser. Bothe of these lasers also have a 1064 nm module.

Cutaneous vascular lesions

Pigmented and non-vascular skin lesions



What does the laser procedure involve?

The patient should wear eye protection, consisting of an opaque covering or goggles, throughout treatment.

Are there any side effects from KTP laser treatment?

Side effects from KTP laser treatment are usually minor and may include:

Related information

Email Newsletter

Would you like to receive our dermatology updates by email?


Submit your images

We're seeking high-quality photos of skin diseases.  


Machine diagnosis

Watch DermNet's proposal to create a 'Skin Disease Image Recognition Tool' - winner of the 2017 'Clinicians' Challenge Active Award' by the NZ Ministry of Health and HiNZ.

Subscribe to our mailing list

* indicates required
DermNet NZ Newsletter