Always consult your Laser Safety Officer (LSO) or another qualified laser safety professional when evaluating laser hazards and selecting safety controls. Appropriate controls depend on the actual laser system, application, and reasonably foreseeable worst-case exposure conditions. Always verify the operating wavelength and specifications provided by the laser manufacturer.
1064 nm is a near-infrared laser wavelength commonly associated with Nd:YAG lasers and encountered in a variety of industrial laser systems.
Because 1064 nm radiation is invisible to the human eye and capable of reaching the retina, it presents important laser safety considerations.
Understanding the wavelength is also important when selecting laser safety eyewear, viewing windows, barriers, and other protective equipment.
What Does 1064 nm Mean?
A laser's wavelength describes the wavelength of the electromagnetic radiation it produces.
1064 nm means:
1064 nanometers = 1.064 micrometers (µm)
This places 1064 nm just beyond the visible portion of the electromagnetic spectrum in the near-infrared (near-IR) region.
The human eye can detect only a relatively small portion of the electromagnetic spectrum. Because 1064 nm falls outside that visible range, you cannot see the 1064 nm operating beam with the naked eye.
Is a 1064 nm Laser Visible?
No. The 1064 nm operating beam is invisible to the human eye.
This is an important safety consideration.
You cannot rely on visible brightness to determine:
Whether the laser is operating
Where the beam is traveling
Whether a reflection is present
How intense the laser radiation may be
A hazardous 1064 nm beam or reflection can therefore be present without providing a visible indication to the operator.
What Types of Lasers Operate at 1064 nm?
Nd:YAG Lasers
1064 nm is the fundamental wavelength commonly associated with Nd:YAG lasers.
Nd:YAG stands for neodymium-doped yttrium aluminum garnet, a solid-state laser gain medium.
Nd:YAG lasers are used in a wide variety of industrial, scientific, and other applications.
Fiber Lasers
1064 nm and nearby near-infrared wavelengths are also encountered with fiber laser systems.
However, you should not assume that every fiber laser operates at exactly 1064 nm.
Industrial fiber lasers may operate around:
1064 nm
1070 nm
1075 nm
1080 nm
or at other wavelengths depending on the particular system.
“Fiber laser” describes the laser technology—it does not establish the exact operating wavelength.
Always verify the actual wavelength specified by the manufacturer.
Why Is 1064 nm Hazardous to the Eye?
1064 nm is particularly important from an eye-safety perspective because it falls within the retinal hazard region.
Near-infrared radiation around 1064 nm can pass through the front structures of the eye and reach the retina.
The optical system of the eye can then focus that radiation onto a relatively small area of retinal tissue, potentially increasing the irradiance at the retina.
At the same time, the operating beam is invisible.
This combination makes appropriate engineering controls, administrative controls, and PPE important whenever hazardous 1064 nm radiation could be accessible.
The actual hazard depends on the laser parameters and exposure conditions and should be determined through an appropriate laser hazard evaluation.
1064 nm vs. 1070 nm vs. 1080 nm
These wavelengths are close together and all fall within the near-infrared region, but they should not automatically be treated as interchangeable specifications.
This is particularly important when selecting laser safety eyewear and viewing windows.
For example, eyewear providing:
OD 6+ @ 1064 nm
should not automatically be assumed to provide OD 6+ at 1080 nm unless the manufacturer's published protection range includes 1080 nm.
A single protective product may cover all of these wavelengths, but the actual specifications should be verified.
For more information, see:
Don't Confuse the Operating Beam With the Aiming Beam
Many industrial laser systems use a separate visible aiming, guide, or alignment beam.
For example, an operator may see a visible red beam while the actual processing laser operates invisibly at or around 1064 nm.
The visible beam should not be assumed to represent the wavelength, power, or hazard of the primary operating beam.
Any accessible wavelengths that could present a hazard should be considered as part of the laser hazard evaluation.
For more information, see:
What Laser Safety Glasses Are Used for 1064 nm?
Laser safety eyewear should provide protection at the actual laser wavelength and sufficient optical density (OD) for the reasonably foreseeable worst-case exposure conditions.
Knowing that a laser operates at 1064 nm establishes the wavelength that needs to be considered, but it does not by itself establish the required OD.
The required OD should be determined through the laser hazard evaluation.
If you already know that you require a specific OD at 1064 nm, compare that requirement directly against the eyewear manufacturer's published OD specifications.
For more information, see:
What Laser Safety Window Is Used for 1064 nm?
The same general principle applies to laser safety viewing windows.
The window must provide appropriate wavelength coverage and sufficient OD for the reasonably foreseeable worst-case exposure conditions at the window.
A laser's total wattage alone does not determine the required window OD.
Window location, exposure geometry, beam characteristics, reflections, and other factors can affect the potential exposure at the window.
For more information, see:
What About Laser Safety Barriers?
Wavelength is also relevant when evaluating laser safety barriers because laser-material interactions can vary with wavelength.
Laser Safety Industries performs irradiance testing at 1064 nm for barriers intended for common near-infrared fiber laser applications.
Many industrial fiber lasers operate at 1070 nm or other nearby wavelengths within the broader 1060–1080 nm region. Based on the barrier material, available testing, application, and expected exposure, Laser Safety Industries may recommend these barriers for appropriate applications within the broader 1060–1080 nm range.
However, this should not be interpreted to mean that the barrier has been independently irradiance-tested at every individual wavelength between 1060 and 1080 nm.
The specific test wavelength and test conditions should be distinguished from the broader range of applications for which a barrier may be recommended.
For more information, see:
Are Reflections From a 1064 nm Laser Dangerous?
They can be.
A direct beam is not the only potential source of hazardous laser exposure.
Depending on the laser, material, geometry, and distance, specular and diffuse reflections also present a hazard.
A specular reflection can remain relatively directional, while a diffuse reflection spreads laser energy over a wider range of directions.
Diffuse reflection generally reduces irradiance as the energy spreads, but:
Diffuse does not automatically mean safe.
This is particularly important with high-power Class 4 lasers.
Because 1064 nm radiation is invisible, you also cannot determine whether a reflection is hazardous simply by looking for visible light.
Containment and other controls should therefore consider reasonably foreseeable worst-case beam paths and reflections.
Does Class 4 Tell Me What Safety Equipment I Need?
No.
Laser classification and laser hazard evaluation are related, but they are not the same thing.
A laser classification describes the laser product according to its accessible emission and potential hazard under specified conditions.
The laser hazard evaluation considers the actual laser, task, exposure conditions, and environment to determine appropriate controls.
Knowing that a 1064 nm laser is Class 4 therefore does not, by itself, tell you the required eyewear OD, viewing-window OD, barrier rating, or complete containment configuration.
For more information, see:
The Bottom Line
1064 nm is an invisible near-infrared wavelength commonly associated with Nd:YAG lasers and encountered in fiber and other industrial laser systems.
Because radiation at this wavelength can reach the retina and cannot be seen by the human eye, appropriate laser safety controls are important whenever hazardous radiation could be accessible.
Remember:
1064 nm is invisible.
It falls within the retinal hazard region.
Not every fiber laser operates at exactly 1064 nm.
1064 nm, 1070 nm, and 1080 nm should not automatically be treated as interchangeable specifications.
Eyewear and windows should be evaluated using their published wavelength and OD specifications.
Laser Safety Industries' near-IR barrier irradiance testing is performed at 1064 nm; broader 1060–1080 nm recommendations should not be interpreted as testing at every wavelength in that range.
Classification alone does not determine the required safety controls.
Always verify the specifications of the actual laser system and base safety controls on the laser hazard evaluation and reasonably foreseeable worst-case exposure conditions.