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Specifying Laser Diode Modules for Photodynamic Therapy

Written by: Danielle Burke on Sep 30th, 2016

Through photodynamic therapy, a range of soft tissue conditions in both humans and animals can be treated using targeted lasers. Here is our guide to the types of laser treatment available and the requirements for a diode laser systems that deliver stable laser energy at specific wavelengths and powers.

Laser diode modules for Low level laser therapy

Low level laser therapy (LLLT), or cold laser therapy, has been used to treat a range of conditions including skin cancer and soft tissue injuries, for wound healing and nerve regeneration. Using LLLT, cells can be stimulated directly, or the light can interact with a drug injected into the body to assist in creating a reaction that aids in the patient’s treatment.

Photo sensitizers

A photo sensitizer is administered to the area to be treated in many applications of photodynamic therapy, using a precise wavelength and power of light from either an LED or a laser source  to excite the photo sensitizer. This method causes a reaction in the body of the patient to treat a localised, injured area.

Direct application

There are cases where a photo sensitizer is not required, as light from a laser source can be applied directly. The light penetrates the skin and treats the soft tissue.  For example, this method can be used to aid in weight loss by exciting the fat cells. The laser liquefies fat within fat cells and causes the cells to release their contents which are then naturally removed from the body. As a result of the collapsed fat cells the area where the laser was administered reduces.  Again, careful selection of the laser is necessary for a precise, localised treatment, with wavelength and power configurations matched to the specific application. Furthermore, a fibre coupled solution enables a more precise and targeted treatment to be administered to a specific area.


The varied requirements for LLLT and photodynamic therapy necessitate versatile modules and assemblies. ProPhotonix offers a range of standard products, and manufactures solutions for many applications in the medical and veterinary fields. Bespoke solutions and custom designs are also available, which enables products to be carefully tailored to meet your needs and ensures that every laser therapy system achieves the most effective results.

For more information on options when specifying a laser diode module for Photodynamic Therapy, contact ProPhotonix at

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