EN IEC 60825-1 Safety of Laser Products - Part 1: Equipment Classification and Requirements

The “EN IEC 60825-1 Safety of laser products - Part 1: Equipment classification and requirements” standard, developed by the International Electrotechnical Commission (IEC) and later published as a European standard within the scope of harmonization efforts, applies to the safety of laser products emitting laser radiation in the wavelength range of 180 nm to 1 mm.

Although lasers that emit light at wavelengths lower than 180 nm (in the vacuum ultraviolet range) exist, potential optical radiation hazards are naturally minimal since the laser beam must normally be contained within a vacuum housing, and therefore they are not included within the scope of this standard.

A laser product may consist of a single laser with or without a separate power source, or it may incorporate one or more lasers in a complex optical, electrical, or mechanical system.

Typically, laser products are used for demonstrating physical and optical phenomena, material processing, data reading and storage, information transmission, and display. Such systems have found applications in industry, business, entertainment, research, education, medicine, and consumer products.

This standard applies to a wide range of laser products, from simple laser pointers and barcode scanners to complex industrial systems, medical devices, entertainment displays, research equipment, and consumer electronics containing lasers or high-intensity LEDs, and these products are treated similarly under the rules.

The main objectives of the EN IEC 60825-1 standard are as follows:

• Classifying laser products according to the degree of optical radiation hazard they present under normal operation and reasonably foreseeable failure conditions.
• For manufacturers, defining requirements for protective properties, engineering controls, labeling, and user instructions.
• Minimizing unnecessary exposure to laser radiation and reducing the risk of injury through established safety measures and warnings.
• To assist users and regulators in identifying appropriate control measures based on the assigned class.

This standard focuses on eye and skin hazards from laser radiation (coherent or highly directional light), rather than electrical, mechanical, or chemical risks (which are covered by other standards).

Laser product classification is based on the accessible emission limit. Classification (accessible emission limit) is based on the maximum permissible level of laser radiation that can escape the product under defined measurement conditions (aperture size, distance, monitoring time). Products are divided into classes reflecting increasing levels of danger:

• Class 1: Safe under all reasonably foreseeable conditions (including, in some cases, optical imaging aids). No danger during normal use.
• Class 1M: Safe for unassisted viewing, but potentially dangerous when viewed with optical instruments (e.g., magnifying glasses or telescopes).
• Class 2: Visible lasers (400-700 nm), the natural avoidance response (blinking within approximately 0,25 seconds) prevents injury in most cases.
• Class 2M: Similar to Class 2, but dangerous when viewed with optical aids.
• Class 3R: Low-risk lasers that can exceed the eye avoidance response limit but are below higher danger thresholds (risk of injury from direct exposure is small but possible).
• Class 3B: Medium-power lasers; direct beam imaging or specular reflection imaging is hazardous, diffuse reflection is generally safe.
• Class 4: High-powered lasers can cause injuries from direct, specular, or diffuse reflections, and often pose fire hazards.

Class 1C, a newer subclass introduced in the latest revision, applies to certain high-power enclosed systems designed for skin contact applications (e.g., some cosmetic or medical devices) where emissions are limited to intentional contact points.

The classification takes into account wavelength-dependent biological effects, pulse characteristics, and extended source and point source behavior. It also includes updates consistent with the International Commission on Non-Ionizing Radiation Protection's exposure limit guidelines.

The basic requirements for manufacturers are as follows:

• Testing and measuring accessible emissions under normal operating and single failure conditions.
• Risk analysis elements include assessing whether failures are reasonably foreseeable and whether functional safety features (e.g., automatic power reduction) are necessary.
• Engineering controls: such as interlocking systems, key switches, emission gauges, and light curtains.
• Labeling: Class-specific warning labels, diaphragm labels, descriptive text, and symbols.
• User information: Instructions, precautions, and a user guide for higher grades.

Components sold for integration into end products are generally exempt if the end product is compliant, but removable, operable laser systems must comply with the regulations.

Many countries adopt EN IEC 60825-1 standard compliance for equivalence to national regulations (e.g., 21 CFR 1040 in the USA). The EN IEC 60825-1 standard harmonizes laser safety requirements worldwide, facilitating international trade while protecting users.

This standard is vital for laser safety because lasers produce highly concentrated, coherent light that, even at low power levels or with short exposure times, can cause serious and often irreversible injuries, primarily to the eyes (e.g., retinal burns leading to permanent vision loss) and skin (e.g., burns or scarring). Without standardized controls, the rapid proliferation of lasers in consumer products (such as markers and toys), industrial tools (cutting/welding machines), medical devices (surgical/laser therapy), the entertainment industry (shows/projectors), and emerging technologies leads to uncontrolled hazards, increased accidents, lawsuits, and obstacles to innovation and global trade.

In short, lasers can cause irreversible damage very quickly. This standard, class hazard level, and typical examples specify the necessary safety precautions:

• Class 1: Safe under all normal conditions.
• Class 2: Safe (apparent) due to the blinking reflex.
• Class 3R: Low risk, but risk of injury when viewed directly.
• Class 3B. Dangerous for direct viewing.
• Class 4: High power, dangerous even from scattered reflection.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services compliant with the EN IEC 60825-1 standard.