Laser surgery uses a focused beam of coherent light to cut, vaporise, coagulate or ablate tissue instead of, or alongside, a steel blade. The laser delivers energy at a specific wavelength that tissue absorbs, turning light into heat in a controlled volume so the surgeon can remove or seal tissue precisely. For a theatre, dermatology or ophthalmology buyer, the key questions are which wavelength suits the intended procedures, how the beam is delivered, what safety controls are required, and the cost of consumables and servicing over the system's life.
Different lasers do different jobs because wavelength governs absorption. A wavelength absorbed strongly by water cuts and vaporises soft tissue; one absorbed by haemoglobin or pigment targets vessels or skin lesions; another passes through clear ocular media to treat the retina. Choosing a laser is really about matching wavelength to the tissue target.
How a surgical laser works
A laser produces light that is monochromatic, coherent, and highly directional, so it can be focused to a small, intense spot. In tissue, that energy is absorbed by a chromophore, most often water, haemoglobin or melanin, and converted to heat. Depending on power, spot size, and exposure time, the effect ranges from gentle coagulation through cutting to explosive vaporisation. The surgeon controls dose through power in watts, spot size, and whether the beam is continuous or pulsed. Pulsed and Q-switched modes concentrate energy into very short bursts, which confines heat to the target and spares surrounding tissue, a principle used heavily in dermatology and ophthalmology. Because the beam seals small vessels as it cuts, laser surgery can reduce bleeding in vascular tissue.
Common surgical laser types and their wavelengths
Several laser media are used across surgery, each defined by its wavelength and tissue interaction.
CO2 laser
The carbon dioxide laser emits in the far infrared and is absorbed almost entirely by water, making it an excellent soft-tissue cutting and vaporising tool for ENT, gynaecology, dermatology and oral surgery. Its energy is absorbed superficially, giving precise ablation with limited depth of penetration.
Nd:Y AG and holmium:Y AG
Neodymium-doped YAG lasers penetrate more deeply and coagulate larger volumes, useful in urology and some tumour work, and can be delivered through a flexible fibre down an endoscope. Holmium: YAG is strongly absorbed by water and is a workhorse for lithotripsy of urinary stones and soft-tissue work in urology, fragmenting stones with short pulses while limiting damage to surrounding mucosa.
Diode and KTP lasers
Compact diode lasers span a range of wavelengths for coagulation, vascular and soft-tissue applications. The frequency-doubled KTP laser emits green light absorbed by haemoglobin, suiting vascular lesions and some prostate procedures.
Excimer and ophthalmic lasers
Excimer lasers emit ultraviolet light that ablates corneal tissue with sub-micron precision for refractive surgery, while other ophthalmic lasers treat the retina or perform capsulotomy through the clear media of the eye. Because the eye transmits some wavelengths and absorbs others, ophthalmic systems are engineered around the specific structure being treated, and the same wavelength that passes harmlessly through the cornea can be focused to act on the retina.
No single laser does everything well, which is why some departments run more than one platform or choose a multi-wavelength system. The practical lesson for a buyer is to start from the list of procedures and the tissue each targets, then let that dictate the wavelength rather than being drawn to a specification sheet. A powerful source at the wrong wavelength for your work is of little use, while a modest system matched to the tissue target performs case after case reliably.
Beam delivery and consumables
How the beam reaches the tissue varies. Many systems use an articulated arm with mirrors or a flexible fibre passed down an endoscope, while others couple to a scanner or a slit lamp. Fibres, handpieces and scanner tips are often consumables with a defined life, so the delivery system is part of the running cost, not an afterthought. When comparing platforms, check which delivery options each procedure needs, whether fibres are reusable or single-use, and how they are reprocessed. A laser that cannot reach the operative site in the way a speciality works offers little value, however capable the source.
Laser safety and staff protection
A surgical laser is a controlled hazard, and safety governance is mandatory, not optional. Every laser is assigned a hazard class, and Class 4 surgical lasers can injure eyes and skin and ignite drapes or airway gases. Controls include a designated laser-controlled area, warning signs and interlocks, wavelength-specific eye protection for everyone present, a nominated laser protection supervisor, and non-reflective instruments. Plume from tissue vaporisation must be captured by a smoke evacuator. Fire risk near the airway or with alcohol-based prep demands specific precautions. The HSE guides managing artificial optical radiation at work, and local rules should be documented before a laser list runs.
Key specifications a buyer must check
Match the wavelength to the tissue target for your intended procedures first, then review power range, pulse modes, spot-size options and the delivery systems supported. Check footprint, cooling requirements and mains supply, aiming-beam type, and the interlock and safety features. Confirm which fibres, tips and filters are consumable and their cost, and whether the platform covers more than one speciality. For shared theatre lasers, portability and quick set-up between rooms may matter. Verify the training and accreditation the manufacturer requires for safe operation.
Standards, regulation and governance
A surgical laser is a medical device needing UKCA or CE marking and a declaration of conformity, and it is built to the IEC 60601 family, including the particular standard for laser equipment safety. Great Britain device registration and vigilance sit with the MHRA, with wider guidance on GOV.UK. Clinical use is shaped by local laser safety policy and, where relevant, national clinical guidance. Ask suppliers for the declaration of conformity, the laser class documentation and the recommended protective eyewear specifications for each wavelength.
Consumables, servicing and total cost of ownership
Purchase price is only the start. Fibres, handpieces, scanner tips and filters are consumed, some lasers need periodic recharging of the lasing medium or optics service, and cooling systems need maintenance. Wavelength-specific eyewear must be provided for every member of staff in the controlled area. Model the cost per case across fibres and tips at your expected volume, add the service contract and eyewear, and compare that with the throughput each platform supports. Ask about warranty, loan cover, engineer response times, and the price of failure-prone optics. The MediGear buyers team can compare laser platforms across specialities, or contact us for guidance.
Procurement checklist
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Match the laser wavelength to the tissue target for your intended procedures.
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Review power range, pulse modes, spot sizes and supported delivery systems.
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Confirm which fibres, tips and filters are consumable and their cost.
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Verify laser class, interlocks, controlled-area needs and required eyewear.
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Check UKCA or CE marking, IEC 60601 laser-safety compliance and MHRA registration.
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Confirm smoke evacuation for surgical plume and airway fire precautions.
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Model cost per case across fibres, tips, servicing and protective eyewear.
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Check the training and accreditation the manufacturer requires.
Conclusion
Laser surgery covers a family of very different tools, and the right one is defined by wavelength, delivery and the safety framework around it rather than headline power. Decide which tissue targets and procedures the system must serve, confirm the delivery options and consumables, and build the safety governance and eyewear into the plan from the outset. Comparing verified laser platforms through MediGear helps your service choose a system matched to its procedures and to safe, cost-effective use.
Disclaimer
This article is for informational purposes only. It is published by MediGear (medigear.uk) for general information and procurement guidance, and is not clinical, diagnostic, treatment, technical, engineering, legal or regulatory advice, nor a product endorsement, guarantee or substitute for professional assessment. MediGear does not provide medical consultations. Buyers should consult their clinical, biomedical, estates and regulatory contacts, and the manufacturer's documentation, and independently verify all specifications, certifications, compatibility and suitability before purchase. Specifications, certifications and availability are correct at the time of publication and may change without notice. MediGear is a medical-equipment distributor and does not sell medicines or pharmaceutical products.
