Core Viewpoint - The use of Class3R lasers in concerts can create impressive visual effects, but safety measures must be in place to mitigate potential risks associated with laser exposure [1][5]. Group 1: Laser Classification and Safety - Class3R lasers are commonly used in concerts and are categorized as medium to high power lasers, capable of producing bright and clear beams in dark environments [2][3]. - The International Electrotechnical Commission (IEC) classifies lasers into four categories (Class1 to Class4) based on their output power and potential hazards, with Class3R being a specific subset that poses certain risks [2][3]. - Safety risks associated with Class3R lasers include potential retinal damage from direct eye exposure, which can occur even with brief contact [3][5]. Group 2: Risk Mitigation Measures - To control risks, dynamic energy regulation systems are employed during concerts to monitor and adjust laser output in real-time, ensuring that exposure levels remain within safe limits [4]. - Specific safety measures include maintaining a minimum distance of 3 meters between the laser beam and the audience, and projecting lasers at angles greater than 30 degrees to avoid direct exposure [4][6]. - It is recommended that audience members avoid direct eye contact with laser beams and take precautions, such as closing their eyes or turning away during laser displays [6].

近些年，不少演唱会倾向于使用激光打造出众的舞美效果。那么，大型演出使用的高密度激光是否安 全？人们应该如何避免被激光伤害？科技日报记者日前就此采访了相关专家，为您一探究竟。 科技日报记者 王姗姗 前不久，某歌手在生日演唱会上，使用高密度激光打造"激光银河"舞美特效，很好地调动了现场气氛， 但有观众将此调侃为"致死量激光"。这也引发了公众对激光危害的讨论。 演唱会通常会使用"动态能量调节系统"实时监控和调整激光输出。"在演唱会中，'动态能量调节系统'通 过传感器监测环境光强、观众位置和激光路径，自动降低或调整激光功率和方向，以防止观众过度暴 露。"韩德专举例道，当监测到激光强度超过阈值时，这套系统会动态调低激光能量。同时，该系统还 可以通过调整激光投射角度和高度，避免光束直射人群，减少眼部或皮肤受伤的可能性。 第二，要采取必要的防护措施。例如让激光设备以30度以上仰角投射激光，并确保光束路径与观众头部 保持3米以上的安全距离。 此外，如果现场工作人员长时间处于激光覆盖区域，则需佩戴符合标准的激光防护装备，防止眼部因激 光照射出现刺痛、视物模糊等不适。 避免眼睛直视光束 针对现场观众"致死量激光"的调侃，韩德专认 ...

Core Viewpoint - The use of high-density lasers, specifically Class3R lasers, in concerts has raised public concern regarding safety, particularly in relation to potential eye damage from direct exposure [1][5]. Group 1: Laser Classification and Safety - Class3R lasers are commonly used in concerts and are categorized by the International Electrotechnical Commission (IEC) as having medium to high output power, suitable for creating visually impactful stage effects [2][3]. - The IEC standard 60825-1 classifies lasers into four categories (Class1 to Class4), with Class3R being a subcategory that poses certain safety risks if not managed properly [2][3]. Group 2: Safety Measures and Recommendations - To mitigate risks associated with Class3R lasers, it is crucial to limit the output power and exposure duration, with a recommended maximum exposure time of 0.25 seconds [4]. - Dynamic energy regulation systems are employed during concerts to monitor and adjust laser output in real-time, ensuring safety by preventing excessive exposure to the audience [4]. - Additional safety measures include projecting lasers at angles above 30 degrees and maintaining a minimum distance of 3 meters between the laser beam path and the audience [4]. Group 3: Public Awareness and Precautions - Despite the safety measures in place, there are still risks associated with improper exposure to Class3R lasers, which can lead to eye damage or skin issues if individuals are repeatedly exposed [5]. - Audiences are advised to avoid direct eye contact with laser beams and to take precautions, such as closing their eyes or turning away during laser displays [5][6].