Laser Standards and Classifications (2024)

Among the most often asked questions in the laser industry is that of the differences between the various laser standards and classifications. In an effort to provide some clarity on the subject, the following is presented:

ANSI

The American National Standards Institute (ANSI) is an organization for which expert volunteers participate on committees to set industry consensus standards in various fields. The ANSI Z136 Committee has published or has under development seven standards specific to the laser field.

The current version of the main ANSI Z136.1 Standard (Z136.1-2000) assigns lasers into one of four broad hazard Classes (1, 2, 3a, 3b and 4) depending on the potential for causing biological damage. Classification is determined by calculations based on exposure time, laser wavelength and average power for CW or repetitively-pulsed lasers and total energy per pulse for pulsed lasers.(1)

These calculations are used to determine a factor defined as the Accessible Emission Limit, or AEL which is the mathematical product of the Maximum Permissible Exposure limit (MPE) given in the Standard and an area factor computed from the defined term called the Limiting Aperture (LA). That is: AEL = MPE x Area of LA .

Limiting Apertures are dependent on factors such as laser wavelength and are based on physical factors such as the fully dilated pupil size (7mm) and beam “hotspots” (1mm).

For most all exposures to the skin and IR exposures to the eye lasting greater 10 seconds, the involuntary movement of the eyes and the body as well as heat conduction will average an irradiance profile over an area of about 10 mm2, even if the irradiated body part is kept intentionally still. This equates to a size of about 3.5 mm.

Especially in the near-infrared, radiation is penetrating relatively deep into skin and due to scattering, the irradiance profile is averaged over corresponding dimensions. For wavelengths larger than 0.1 mm, an aperture size of 11 mm is specified, as smaller apertures would lead to inaccurate measurements due to diffraction effects.

Each laser class is based on these AEL thresholds:

  • Class 1 lasersor systems cannot emit accessible laser radiation in excess of the applicable Class 1 AEL for any exposure times within the maximum duration inherent in the design or intended use of the laser. Class 1 lasers are exempt from all beam-hazard control measures.
  • Class 2 lasersare CW and repetitively pulsed lasers with wavelengths between 0.4 µm and 0.7 µm that can emit energy in excess of the Class 1 AEL, but do not exceed the Class 1 AEL for an emission duration less than 0.25 seconds and have an average radiant power of 1mW or less.
  • Class 3a lasers have an accessible output between 1 and 5 times the Class 1 AEL for wavelengths shorter than 0.4 µm or longer than 0.7 µm, or less than 5 times the Class 2 AEL for wavelengths between 0.4 µm and 0.7 µm.
  • Class 3b lasers cannot emit an average radiant power greater than 0.5 Watts for an exposure time equal to or greater than 0.25 seconds or 0.125 Joules for an exposure time less than 0.25 seconds for wavelengths between 0.18 µm and 0.4 µm, or between 1.4 µm and 1 mm. In addition, lasers between 0.4 µm and 1.4 µm exceeding the Class 3a AEL cannot emit an average radiant power greater than 0.5 Watts for exposures equal to or greater than 0.25 seconds, or a radiant energy greater than 0.03 Joules per pulse.
  • Class 4 lasers and laser systems exceed the Class 3b AEL.

(1) Note that the ANSI Z136.1 (2000) Standard is under revision and is [proposing the adoption of the IEC Standard’s Classification Scheme described below.

CDRH

The Center for Devices and Radiological Health (CDRH) is a regulatory bureau within the U.S. Federal Food and Drug Administration (FDA) of the Department of Health and Human Services. CDRH has been chartered by Congress to standardize the performance safety of manufactured laser products. All laser products that have been manufactured and entered into commerce, after August 2, 1976, must comply with these regulations.

The regulation is known as the Federal Laser Product Performance Standard (FLPPS), and is identified as 21CFR subchapter parts 1040.10 and 1040.11. The FLPPS assigns lasers into one of four broad hazards in a manner similar to the ANSI Z136.1 (2000) Standard - Classes I, II, IIIa, IIIb and IV) depending on the potential for causing biological damage.(2)

  • Class I laser product means any laser product that does not permit human access during the operation to levels of laser radiation in excess of the accessible emission limits as defined in Table I of 21 CFR Subchapter J Part 1040.10. Class I levels of laser radiation are not considered to be hazardous.
  • Class II laser product means any laser product that permits human access during operation to levels of visible laser radiation in excess of the accessible emission limits contained in Table II-A of 21 CFR Subchapter J Part 1040.10, but does not permit human access during operation to levels of laser radiation in excess of the accessible emission limits contained in Table II of 21 CFR Subchapter J Part 1040.10. Class II levels of laser radiation are considered to be a chronic viewing hazard.
  • Class IIIa laser product means any laser product that permits human access during operation to levels of visible laser radiation in excess of the accessible emission limits contained in Table II of 21 CFR Subchapter J Part 1040.10, but does not permit human access during operation to levels of laser radiation in excess of the accessible emission limits contained in Table III-A of 21 CFR Subchapter J Part 1040.10. Class IIIa levels of laser radiation are considered to be, depending upon the irradiance, either an acute intrabeam viewing hazard or chronic viewing hazard, and an acute viewing hazard if viewed directly with optical instruments.
  • Class IIIb laser product means any laser product that permits human access during operation to levels of laser radiation in excess of the accessible emission limits of Table III-A, but does not permit human access during operation to levels of laser radiation in excess of the accessible emission limits contained in Table III-B of 21 CFR Subchapter J Part 1040.10. Class IIIb levels of laser radiation are considered to be an acute hazard to the skin and eyes from direct radiation. Class IIIb laser products may have removable panels that, when displaced, permit access to levels of laser radiation ranging from Class II to Class IV.
  • Class IV laser product means any laser that permits human access during operation to levels of laser radiation in excess of the accessible emission limits contained in Table III-B of 21 CFR Subchapter J Part 1040.10. Class IV levels of laser radiation are considered to be an acute hazard to the skin and eyes from direct and scattered radiation. Class IV laser products may have removable panels that, when displaced, permit access to levels of laser radiation ranging from Class II to Class IV.

(2) Note that the FDA/CDRH LPP Standard is under revision and is [proposing the adoption of the IEC Standard’s Classification Scheme described below.

OSHA

Within the Department of Labor is the Occupational Safety and Health Administration (OSHA), which is responsible for assuring a safe work place. At the present time, OSHA does not have a comprehensive laser safety standard. Instead, the OSHA policy has been to rely on ANSI Z136.1, the generally accepted industry laser standard, and FDA/CDRH laser manufacturer requirements.

IEC

The International Electrotechnical Commission (IEC) is a global organization that prepares and publishes international standards for all electrical, electronic and related technologies. The IEC document 60825-1 is the primary standard that outlines the safety of laser products. Classification is based on calculations and determined by the AEL as with the ANSI standard, but the IEC standard also incorporates viewing conditions:

  • Class 1 lasers are very low risk and "safe under reasonably foreseeable use", including the use of optical instruments for intrabeam viewing.
  • Class 1M lasers have wavelengths between 302.5 nm and 4000 nm, and are safe except when used with optical aids (e.g. binoculars).
  • Class 2 lasers do not permit human access to exposure levels beyond the Class 2 AEL for wavelengths between 400 nm and 700 nm. Any emissions outside this wavelength region must be below the Class 1 AEL.
  • Class 2M lasers have wavelengths between 400 nm and 700 nm, and are potentially hazardous when viewed with an optical instrument. Any emissions outside this wavelength region must be below the Class 1M AEL.
  • Class 3R lasers range from 302.5 nm and 106 nm, and is potentially hazardous but the risk is lower than that of Class 3B lasers. The accessible emission limit is within 5 times the Class 2 AEL for wavelengths between 400 nm and 700 nm, and within 5 times the Class 1 AEL for wavelengths outside this region.
  • Class 3B lasers are normally hazardous under direct beam viewing conditions, but are normally safe when viewing diffuse reflections.
  • Class 4 lasers are hazardous under both intrabeam and diffuse reflection viewing conditions. They may cause also skin injuries and are potential fire hazards.

The “M” Classes **

As discussed below in the M Classes Table, a laser product is classified as the "non-M" class when both Conditions 1 and 2 are satisfied, i.e. the measured power is below the AEL (and therefore below the MPE for the eye) even when the measurement requirements reflect the possible use of optical instruments. If one of the power values measured according to Condition 1 or Condition 2 is larger than the AEL, the product can no longer be in that "non-M" category, i.e. it can not be Class 1 or Class 2. It can however be in the Class-M category when the power or energy measured with a 7 mm aperture at a distance of 10 cm from the apparent source is below the AEL. The measurement condition of 7 mm aperture at a distance of 10 cm from the apparent source ensures that the exposure of the naked eye to radiation from a Class-M product is below the MPE for the eye, i.e. as long as no optical instrument is used, Class 1M is as safe as Class 1 (and Class 2 as safe as Class 2M).

As the MPE can potentially be exceeded considerably for the Classes 1M and 2M when exposure occurs with optical instruments, the maximum power or energy collected with optical instruments (i.e. the power or energy as measured under Condition 1 and 2) is limited to the AEL of Class 3B. Consequently in terms of the power of a product when measured with a large aperture (5 cm at 2 m) or at close distance (7 mm at 14 mm), this power can be larger for a Class 1M or Class 2M laser product as the power which is allowed for Class 3R, for instance, for a HeNe laser product (632.8 nm) with a 10 mW collimated beam with a diameter of 4 cm (1/e points) at the exit aperture and 5 cm at a distance of 2 m from the laser, the power measured through a 7 mm pupil will be about 0.3 mW, hence the product would be assigned Class 1M (the AEL for Class 1M is 0.39 mW for a point source), however, when measured with a 5 cm aperture. all of the 10 mW would be collected and the measured power would exceed the AEL for Class 3R. The product is to be classified as Class 1M, as this is the smallest AEL which is not exceeded. The irradiance is at least a factor of 3 below the MPE for 0.25 second exposure duration and is also below the MPE for an exposure duration longer than 10 seconds.

The concept outlined here facilitates a practical risk management and also makes the setting of restrictions on the use of a given category of products simpler and more flexible. For instance when the exposure with optical instruments is unlikely, the use of Class 1M and Class 2M will represent a correspondingly small risk for injury. For the practical use of the Class-M category in terms of user controls and restrictions it is important to define which one of the two measurement conditions was not fulfilled, i.e. if the AEL was exceeded for measurement Condition 1, user controls should be considered when it is anticipated that exposure through telescopes can occur. Generally, collimated laser beams with a large diameter fall in that category and an example could be the use of a range finder on a military training ground where it is “reasonably foreseeable” that exposure with large binoculars occurs.

By way of comparison, the use of a Class 1M laser speed meter when used for traffic control, where exposure with binoculars is unlikely, might be acceptable in terms of associated risk, i.e. probability for injury. On the other hand, when a product is assigned to the Class-M category because it failed Condition 2, it is usually safe to be exposed to radiation from the product through binoculars or telescopes, while an exposure with an eye loupe or magnifier would increase the hazard. An example for the general category of products which could fail Condition 2 are LED and various fiber optic based laser sources.

** The “M” Classes portion is an excerpt from Review of Current Topics in Laser Safety By Karl Schulmeister, Austrian Research Centers Seibersdorf

Comparison of Classifications

The following charts have been created to illustrate the various similarities and differences between the classification criteria of the different laser standards.

Class IEC 60825 (Amend. 2) U.S. FDA/CDRH ANSI-Z136.1 (2000)

Class 1

Any laser or laser system containing a laser that cannot emit laser radiation at levels that are known to cause eye or skin injury during normal operation. This does not apply to service periods requiring access to Class 1 enclosures containing higher class lasers.

Class 1M

Not known to cause eye or skin damage unless collecting optics are used.

N/A

N/A

Class 2a

N/A

Visible lasers that are not intended for viewing and cannot produce any known eye or skin injury during operation based on a maximum exposure time of 1000 seconds.

N/A

Class 2

Visible lasers considered incapable of emitting laser radiation at levels that are known to cause skin or eye injury within the time period of the human eye aversion response (0.25 seconds).

Class 2M

Not known to cause eye or skin damage within the aversion response time unless collecting optics are used.

N/A

N/A

Class 3a

N/A

Lasers similar to Class 2 with the exception that collecting optics cannot be used to directly view the beam

Visible Only

Lasers similar to Class 2 with the exception that collecting optics cannot be used to directly view the beam

Class 3R

Replaces Class 3a and has different limits. Up to 5 times the Class 2 limit for visible and 5 times the Class 1 limits for some invisible.

N/A

N/A

Class 3b

Medium powered lasers (visible or invisible regions) that present a potential eye hazard for intrabeam (direct) or specular (mirror-like) conditions. Class 3b lasers do not present a diffuse (scatter) hazard or significant skin hazard except for higher powered 3b lasers operating at certain wavelength regions.

Class 4

High powered lasers (visible or invisible) considered to present potential acute hazard to the eye and skin for both direct (intrabeam) and scatter (diffused) conditions. Also have potential hazard considerations for fire (ignition) and byproduct emissions from target or process materials.

Overview of Laser Safety Classes*

Class

Type of lasers

Meaning

Relationship to MPE

Hazard Area

Typical AEL for CW Lasers

Class 1

Very low power lasers or encapsulated lasers

Safe

MPEs are not exceeded, even for long exposure duration (either 100 seconds or 30000 seconds), even with the use of optical instruments

No hazard area (NOHA)

40 µW for blue

Class 1M

Very low power lasers; either collimated with large beam dia­meter or highly divergent

Safe for the naked eye, potentially hazardous when optical instruments** are used

MPEs are not exceeded for the naked eye, even for long exposure durations, but maybe exceeded with the use of optical instruments**

No hazard area for the naked eye, but hazard area for the use of optical instruments** (extended NOHA)

Same as Class 1, distinction with measurement requirements

Class 2

Visible low power lasers

Safe for unintended exposure, prolonged staring should be avoided

Blink reflex limits exposure dura­tion to nominally 0.25 seconds. MPE for 0.25 seconds not exceeded, even with the use of optical instruments.

No hazard area when based on unintended exposure (0.25 seconds exposure duration)

1 mW

Class 2M

Visible low power lasers; either collimated with large beam diameter or highly divergent

Same as Class 2, but potentially hazardous when optical instruments** are used

MPE for 0.25 seconds not exceeded for the naked eye, but maybe exceeded with the use of optical instruments**

No hazard area for the naked eye when based on accidental exposure (0.25 seconds exposure duration), but hazard area for the use of optical instruments** (extended NOHA)

Same as Class 2, distinction with measurement requirements

Class 3R

Low power lasers

Safe when handled carefully. Only small hazard potential for accidental exposure

MPE with naked eye and optical instruments may be exceeded up to 5 times

5 times the limit of Class 1 in UV and IR, and 5 times the limit for Class 2 in visible, i.e. 5 mW

5 times the limit of Class 1 in UV and IR, and 5 times the limit for Class 2 in visible, i.e. 5 mW

Class 3B

Medium power lasers

Hazardous when eye is exposed. Wear Eye Protection within NOHA. Usually no hazard to the skin. Diffuse reflections usually safe

Ocular MPE with naked eye and optical instruments may be exceeded more than 5 times. Skin MPE usually not exceeded.

Hazard area for the eye (NOHA), no hazard area for the skin

500 mW

Class 4

High power lasers

Hazardous to eye and skin, also diffuse reflection may be hazardous. Protect Eye and skin. Fire hazard.

Ocular and skin MPE exceeded, diffuse reflections exceed ocular MPE

Hazard area for the eye and skin, hazard area for diffuse reflections

No limit

**Note for optical instruments: two classes of optical instruments are accounted for: such that increase hazard of well collimated beam with large diameter, i.e. telescopes and binoculars, and such that increase hazard of highly divergent beams (such as from fibers or LEDs), i.e. eye loupes and magnifiers. Generally only one of the group of optical instrument for a given laser product leads to an increase in the hazard. Therefore, at the discretion of the manufacturer, a specific wording can be added to the warning label. See sections on optical instruments and warning labels below.

* Chart Courtesy of David Sliney

Note: The above table discusses the classification scheme and concept of the new (2001) edition of IEC 60825-1 and compares it to the previous scheme in terms of AEL values and definition of the classes. However, additionally to some changes of the class definitions and classification scheme, also the measurement requirements for assessing the class, i.e. the aperture diameter and distance, are somewhat different in the new edition in comparison with the previous version. Therefore, if in above table it says “unchanged”, this means that the concept, definition and AEL of the class is unchanged, but it does not mean that a specific laser product, which was classified as for instance Class 4 because the emission as measured with the previous requirements was slightly above the AEL for Class 3B, might not be classified as Class 3B following the measurement requirements of the new edition of the standard.

Summary of Concept of Subclasses "M"

Time Base

Class

Class -M

AEL for Class 1, 1M

100 seconds or 30000 seconds

Generally safe, even for intentional exposure, for the naked eye and with optical instruments

Safe even for intentional exposure of the naked eye, potentially hazardous for exposure with optical instruments of either category 1 or 2

AEL for Class 2, 2M

0.25 seconds

Safe for accidental exposure, for the naked eye and with optical instruments

Safe for accidental exposure, potentially hazardous for exposure with optical instruments of either category 1 or 2

Measurement Conditions* (measured power < AEL)

Condition 1

Condition 2

To account for possible use of

Binoculars, telescopes

Eye loupes, magnifiers

Unaided eye

Usually limiting condition for

Large diameter well collimated beams

Divergent beams

-

Aperture diameter

50 mm

7 mm

7 mm

Distance

2 m

14 mm

10 cm

b* simplified presentation, strictly only applicable for point sources and for wavelengths in the retinal hazard region. The 2m measurement distance is measured from the physical product while 14 mm and 10 cm distance are measured from the position of the apparent source. For other wavelengths and extended sources the measurement requirements differ and are not discussed here.

Laser Standards and Classifications (2024)

FAQs

Laser Standards and Classifications? ›

For visible-beam consumer lasers, there are four main classes. Each is described in more detail here: Class 2, Class 3R, Class 3B and Class 4. The first two Classes are relatively safe for eye exposure; the last two are hazardous. The chart below shows how the eye injury hazard increases as the laser's power increases.

What are the ANSI classification of lasers? ›

These classifications are Class 1, Class 1M, Class 2, Class 2M, Class 3R, Class 3B, and Class 4, with Class 1 lasers being exempt from any kind of control due to their lack of hazard and Class 4 lasers requiring strict controls in order to reduce the risk of exposure to the eyes or skin.

What are the FDA classification of lasers? ›

Laser Hazard Classes

The FDA recognizes four major hazard classes (I to IV) of lasers, including three subclasses (IIa, IIIa, and IIIb). The higher the class, the more powerful the laser is and the greater the potential to pose serious injury if used improperly.

How are lasers classified? ›

Lasers are classified according to [FDA] or [IEC] standards. The classification of a laser indicates the maximum hazard for the eyes and skin caused by the respective laser radiation. Laser classes define the hazard for the eyes and skin resulting from laser radiation exposure.

What is the difference between Class 1 and Class 4 lasers? ›

The classifications categorize lasers according to their ability to produce damage in exposed people, from class 1 (no hazard during normal use) to class 4 (severe hazard for eyes and skin).

What is 4 laser classification? ›

For visible-light lasers, Class 4 lasers' have an output power 500 milliwatts and above. There is no upper limit for Class 4 -- this is the most hazardous laser classification. Class 4 is the same as the Roman numeral "Class IV" you may see on some lasers' labels.

What is the ADA code for laser? ›

Code D7465 is the one and only procedure code that is specifically technique-sensitive to the laser.

Does the FDA regulate lasers? ›

The FDA has the authority to regulate all kinds of lasers.

Who regulates lasers in the US? ›

FDA/The Center for Devices and Radiological Health (CDRH) is a regulatory bureau within the U.S. Federal Food and Drug Administration (FDA) of the Department of Health and Human Services. CDRH has been chartered by Congress to standardize the performance safety of manufactured laser products.

Are class 2 lasers legal? ›

Class 2 lasers are considered safe for normal operation.

In Australia, the U.K., and many other countries, only Class 2 lasers can be sold as "pointers" or for pointing purposes. (In the U.S., pointers can also be Class 3R.) Class 2 is the same as the Roman numeral "Class II" you may see on some lasers' labels.

What is the most hazardous classification of a laser? ›

Class 4 lasers and laser systems operate at greater than 500 mW (continuous), can emit any wavelength, and are considered an eye, skin, fire, and diffuse reflection hazard. The most stringent control measures have been established for these lasers.

What is a class 5 laser? ›

Class 5 Photonics offers ultrafast, high power laser systems and EUV sources for demanding applications from bio-imaging to ultrafast science and attosecond science.

What is a class 1 laser? ›

The classifications are as follows: Class 1. This class is eye-safe under all operating conditions. A Class 1 laser is safe for use under all reasonably anticipated conditions of use; in other words, it is not expected that the MPE can be exceeded. Class 1 Product.

Are Class 4 lasers illegal in US? ›

Are Class 4 lasers illegal? A. Therapeutic Class 4 lasers are NOT illegal. However, there have been some Class 4 laser pointers which have been sold illegally, can cause severe eye damage and are not permitted for sale in the US.

What is the strongest laser class? ›

Class 4 is the highest class in terms of laser hazards. If you're within the hazard zone, you're exposed to severe eye and skin injuries. In addition, combustible materials shouldn't be in the laser's surroundings to avoid fire hazards. Diffuse reflections of class 4 lasers are also hazardous.

Are Class 3 lasers safe? ›

Higher powered Class IIIb or IEC Class 3B lasers are dangerous and can cause either temporary visual effects or an eye injury.

Is ANSI Z136 safe for lasers? ›

ANSI Z136 Laser Safety Standards

This standard provides guidance for the safe use, maintenance, service, and installation of optical communications systems utilizing laser diodes or light emitting diodes operating at wavelengths between 0.6 mm and 1 mm.

What are Class 3 and 4 lasers? ›

Class 3 lasers have between 1 and 500 mW. This group is referred to as therapeutic 'cold' lasers and come with 'eye caution to eye danger'. Class 4 lasers have more than 500 mW and are referred to as 'hot' lasers.

What are Class 5 lasers? ›

Class 5 Photonics offers ultrafast, high power laser systems and EUV sources for demanding applications from bio-imaging to ultrafast science and attosecond science.

What are Class 3B and 4 lasers used for? ›

One thing remains certain, current scientific and clinical research proves that class 3B lasers are best suited for therapeutic applications and class 4 lasers are best suited for tissue destruction.

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