Excimer lasers rely on carefully controlled gas mixtures to generate high-energy ultraviolet pulses. These mixtures typically combine a noble gas such as argon, krypton, or xenon with a halogen source, while neon and/or helium are commonly used as buffer gases. The exact formulation depends on the required wavelength and system design.
Whether used in semiconductor processing, micromachining, research, medical systems, or optics manufacturing, excimer laser gas plays a direct role in output stability, pulse consistency, and overall laser efficiency. Industrial excimer platforms are commonly offered at wavelengths such as 193 nm and 248 nm, reflecting the importance of gas chemistry in determining laser operation.
Excimer Laser Gas Types and Wavelengths
Excimer lasers are classified by the rare gas–halogen combination used in the laser mixture. Each combination produces a different ultraviolet wavelength and is suited to different industrial, scientific, and medical applications. The gas mixture typically contains:
A rare (noble) gas such as argon, krypton, or xenon
A halogen component such as fluorine or chlorine
A buffer gas, typically neon or helium, which stabilizes the discharge and improves energy transfer
Small changes in the gas mixture composition can influence pulse energy, beam stability, and operating lifetime, making the precise formulation of excimer laser gas an important part of laser performance.
We support gas requirements for the most widely used excimer laser families, including:
Argon fluoride (ArF) excimer lasers operate at a wavelength of 193 nm, deep in the ultraviolet region. This extremely short wavelength allows very fine resolution and high photon energy, making ArF lasers ideal for applications requiring precision and minimal thermal damage.
The gas mixture typically contains:
Argon (Ar) as the noble gas component
Fluorine (F₂) or another fluorine source as the halogen
Neon or helium buffer gas
During the electrical discharge inside the laser chamber, argon and fluorine form a short-lived excited molecule known as an excimer (excited dimer). When this molecule returns to the ground state, it releases ultraviolet radiation at 193 nm.
Key Characteristics
Very short UV wavelength
High photon energy for precise material interaction
Excellent absorption in many polymers and biological tissues
Minimal heat-affected zones during ablation
Typical Applications
ArF excimer lasers are widely used in:
Semiconductor lithography
Microelectronics fabrication
Ophthalmic surgery (LASIK and corneal reshaping)
Micro-machining of polymers and organic materials
Scientific spectroscopy
Because fluorine is highly reactive, ArF laser gas mixtures require strict purity control and specialised handling systems.
Tested, Custom Gas Mixtures with Global Distribution
We guarantees the highest quality and precision for individual gas mixtures. Gas cylinders are available for purchase or rent.
Your gas mixture is produced using comprehensive analytical methods, such as fourier transform infrared spectroscopy (FTIR) and gas chromatogram (GC). Goss Scientific guarantees the composition’s accuracy, covering factors like the purity of individual gases, their proportions, and concentration within the final mixture.
The cylinders are precisely filled to the ppm range, with high stability of the gases to ensure the mixture’s quality. Fluorine concentration is carefully monitored using the BUSE fluorine monitor. The analysis results serve as the foundation for issuing the Certificate of Analysis (CoA) or Certificate of Conformity (CoC).
Krypton fluoride (KrF) excimer lasers emit ultraviolet light at 248 nm, which is slightly longer in wavelength than ArF but still within the deep UV region. This wavelength provides an excellent balance between precision material processing and laser efficiency.
Typical gas composition includes:
Krypton (Kr) as the noble gas
Fluorine (F₂) as the halogen source
Neon or helium buffer gas
KrF excimer lasers are among the most widely used excimer systems due to their relatively stable operation and efficient energy conversion.
Key Characteristics
Strong UV absorption in polymers and organic materials
Good pulse energy and beam uniformity
Well-established technology with robust industrial systems
Typical Applications
KrF lasers are commonly used in:
Semiconductor lithography
Thin film processing
Laser annealing of semiconductor materials
Polymer micro-machining
Surface modification of plastics and medical devices
KrF systems are particularly popular in industrial laser processing environments because of their balance of wavelength precision and operational reliability.
Tested, Custom Gas Mixtures with Global Distribution
We guarantees the highest quality and precision for individual gas mixtures. Gas cylinders are available for purchase or rent.
Your gas mixture is produced using comprehensive analytical methods, such as fourier transform infrared spectroscopy (FTIR) and gas chromatogram (GC). Goss Scientific guarantees the composition’s accuracy, covering factors like the purity of individual gases, their proportions, and concentration within the final mixture.
The cylinders are precisely filled to the ppm range, with high stability of the gases to ensure the mixture’s quality. Fluorine concentration is carefully monitored using the BUSE fluorine monitor. The analysis results serve as the foundation for issuing the Certificate of Analysis (CoA) or Certificate of Conformity (CoC).
Xenon chloride (XeCl) excimer lasers produce ultraviolet radiation at 308 nm, which lies closer to the near-UV region. This wavelength interacts differently with materials compared to deeper UV excimer lasers, offering strong absorption in biological tissues and some inorganic materials.
Typical gas mixtures include:
Xenon (Xe) as the noble gas
Hydrogen chloride (HCl) or chlorine-based compounds as the halogen source
Neon or helium buffer gas
In the laser discharge, xenon and chlorine form an excited excimer molecule that emits UV light when it dissociates.
Key Characteristics
Slightly longer UV wavelength
Efficient energy generation in pulsed operation
Suitable for medical and scientific applications
Typical Applications
XeCl excimer lasers are widely used in:
Dermatology treatments (psoriasis and skin therapy)
Medical phototherapy
Laser pumping of dye lasers
Scientific research and spectroscopy
Surface cleaning and modification
Because chlorine compounds are used in the gas mixture, careful gas management and safety procedures are essential.
Tested, Custom Gas Mixtures with Global Distribution
We guarantees the highest quality and precision for individual gas mixtures. Gas cylinders are available for purchase or rent.
Your gas mixture is produced using comprehensive analytical methods, such as fourier transform infrared spectroscopy (FTIR) and gas chromatogram (GC). Goss Scientific guarantees the composition’s accuracy, covering factors like the purity of individual gases, their proportions, and concentration within the final mixture.
The cylinders are precisely filled to the ppm range, with high stability of the gases to ensure the mixture’s quality. Fluorine concentration is carefully monitored using the BUSE fluorine monitor. The analysis results serve as the foundation for issuing the Certificate of Analysis (CoA) or Certificate of Conformity (CoC).
Xenon fluoride (XeF) excimer lasers operate at approximately 351 nm, which lies in the near ultraviolet region. Although less common than ArF or KrF lasers, XeF systems are used where slightly longer UV wavelengths are beneficial.
Typical gas mixtures include:
Xenon (Xe)
Fluorine (F₂)
Neon or helium buffer gases
The XeF excimer forms under electrical discharge conditions and emits UV radiation when the molecule dissociates.
Key Characteristics
Near-UV wavelength
Good beam uniformity
Useful for scientific and photochemical applications
Typical Applications
XeF excimer lasers are used in:
Scientific research
Photochemistry
Materials processing
Laser pumping applications
These systems are less common in high-volume industrial processing but remain important in specialized laboratory environments.
Tested, Custom Gas Mixtures with Global Distribution
We guarantees the highest quality and precision for individual gas mixtures. Gas cylinders are available for purchase or rent.
Your gas mixture is produced using comprehensive analytical methods, such as fourier transform infrared spectroscopy (FTIR) and gas chromatogram (GC). Goss Scientific guarantees the composition’s accuracy, covering factors like the purity of individual gases, their proportions, and concentration within the final mixture.
The cylinders are precisely filled to the ppm range, with high stability of the gases to ensure the mixture’s quality. Fluorine concentration is carefully monitored using the BUSE fluorine monitor. The analysis results serve as the foundation for issuing the Certificate of Analysis (CoA) or Certificate of Conformity (CoC).
Why Gas Quality Matters
The performance of an excimer laser depends heavily on gas purity, correct mixture balance, and stable handling conditions. High-quality excimer laser gas helps support:
Stable pulse-to-pulse energy
Consistent wavelength generation
Reliable ignition and discharge behavior
Longer operational stability between gas services
Reduced contamination risk inside the laser chamber
Because the active medium contains only a small proportion of halogen-containing gas and a much larger proportion of buffer gas, even small changes in gas composition can affect laser behaviour. Manufacturer documentation for excimer systems also highlights the need for controlled gas handling and safety procedures.
Gas Composition Overview
A typical excimer laser gas mixture contains:
A noble gas such as argon, krypton, or xenon
A halogen component such as fluorine or chlorine, sometimes introduced through compounds such as HCl
A buffer gas, commonly neon or helium
This gas mixture forms the laser gain medium used in pulsed UV excimer lasers. In some excimer systems, the fluorine content is very low, with manufacturer site-preparation materials describing concentrations up to about 0.2% in certain premix configurations.
Applications
Excimer lasers are used across advanced technical and industrial environments, including:
Semiconductor and electronics manufacturing
Wafer debonding and laser lift-off
Micromachining of polymers and delicate materials
Optical sensor manufacturing
Pulsed laser deposition
Medical and ophthalmic procedures
Scientific and laboratory research
These applications value excimer lasers for their pulsed UV output and high precision in material interaction.
Safety and Handling
Excimer laser gases require careful handling by trained personnel. While much of the mixture may consist of inert or simple asphyxiant gases such as neon, halogen-containing components can present additional inhalation and irritation hazards. System manufacturers specify dedicated safety measures for installation, operation, leak management, and servicing.
For this reason, excimer laser gas supply should always be paired with proper packaging, traceability, and handling procedures suited to the laser platform and operating environment.
Can’t find something? Email us at sales@gossinst.co.uk or message our team via the contact page. We are always happy to answer any questions you may have regarding our products and will be delighted to assist you in locating precisely what you need.
