Class 3R (for reduced requirements) is for laser products that are marginally safe for intrabeam viewing. Currently few differences exist between the two standards.The IEC recognizes that their current classification scheme is problematic particularly as it relates to evaluations with and without optically aided viewing. These definitions are wordy and cumbersome to read out of context, but when given the specifications of a laser or laser system are not difficult to apply.Not capable of emitting in excess of the Class 1 Accessible Emission Limit (AEL) (Note: AEL's vary by laser wavelength and pulse duration)Most lasers in this class are lasers which are in an enclosure which prohibits or limits access to the laser radiation.Not capable of producing damage to the eye (unless disassembled).CD Rom players are an example of a Class 1 laser product.Same criteria for classification as Class 1 but where beam may be hazardous for viewing with magnificationCW and repetitive-pulse lasers in the visible region of the spectrum (0.4 to 0.7 µm) which can emit accessible radiant energy exceeding the Class 1 AEL for the maximum duration inherent in the laser, but not exceeding the Class 1 AEL for any pulse duration < 0.25 s The output of the laser is not intended to be viewed. The American National Standards Institute (ANSI) The intent of laser hazard classification is to provide warning to users by identifying the hazards associated with the corresponding levels of accessible laser radiation through the use of labels and instruction. ANSI Z136.1 – 2007 Revision of ANSI Z136.1-2000 American National Standard for Safe Use of Lasers Secretariat Laser Institute of America Approved March 16, 2007 Flashblindness, afterimage, and glare can occur as a result of exposure to laser pointers and may result in visual dysfunction that can affect visual-critical activity such as driving or flying. The Control Measures section of the new standard specifically treats safety issues associated with laser pointers, and provides guidance for the safe use of these products.The ANSI Z136.1 standard specifies that design of signs and labels be in accordance with ANSI Z535 series of standards for Accident Preventing Signs. Classes of Lasers (adopted from ANSI Z-136.1-2007) Class 1.
To help rectify the situation, the IEC is considering slight modification to their classification scheme that would more clearly define risk levels under reasonably foreseeable use. An example of a Class 2a laser is a supermarket point-of-sale scanner.Is only a hazard if collected and focused in the eye.Prior to 2007, this classification was known as 3a.Ultraviolet and infrared lasers and laser systems that can emit accessible radiant power in excess of the Class 3a AEL during any emission duration within the maximum duration inherent in design of the laser or system, but that cannot emit an average radiant power in excess of 0.5 W for greater than or equal to 0.25 s or cannot produce a radiant energy greater than 0.125 J within an exposure time > 0.25 s.Visible or near-infrared lasers or systems that emit in excess of the 3a AEL but that cannot emit an average radiant power in excess of 0.5 W for greater than or equal to 0.25 s and cannot produce a radiant energy greater than 0.03 CIs a hazard if the direct or reflected beam is viewed.Direct and reflected exposure can cause both eye and skin injury. The ANSI Z136.1 has always striven to have classification guidelines and requirements closely harmonized with the corresponding international laser safety standard issued by the International Electrotechnical Commission (IEC). The IEC introduced a system for the classification of lasers and other products emitting laser radiation in the wavelength range from 180 nm to 1 mm. The new hazard signs contain an equilateral triangle attention symbol in addition to the familiar sunburst pattern. lasers, sometimes called diode lasers, are not solid-state lasers. use complex organic dyes like rhodamine 6G in liquid solution or suspension as lasing media. ANSI Z136.5 - Safe Use of Lasers in Educational Institutions. A Q-Switched laser is a pulsed laser which contains a shutter-like device that does not allow emission of laser light until opened. This should be contrasted with previous generations of laser pointers that were based on HeNe lasers and were generally classified as Class 2. The IEC 60825-1 (International Electrotechnical Commission) standard defined the different laser classes.
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