So this could help equalize the potential safety risk. In a show situation, however, it may be possible to reduce the power of a low-divergence beam to give the same visual effect as a higher-power, wider beam. A narrow beam concentrates more light in a given area, compared with a wider beam of the same power.
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Safety implications: All other factors such as power being equal, a low-divergence beam is a greater potential safety risk than a high-divergence beam.
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It can be helpful if a specification lists the beam size at a given distance for example, “This laser produces a spot size of 1.5 cm at 25 meters.” A laser also may change divergence depending on the power setting at low power the divergence will be less (narrower) than when the laser is turned up to maximum output. One reason for not listing it is that divergence can be difficult to measure. You may or may not see divergence listed on specifications. The term “Apparent Brightness” does not denote the amount of power the laser modules produce, nor does it denote the actual output power of the system at the output window. As another example, a very narrow, tight laser beam may hold its brightness over a very long distance, but a wider, less focused laser beam may appear brighter over short distances. For example, a 638nm red appears to the eye approximately three times brighter than a 655nm red (which is a deeper color) at the same power. This is based on the fact that the eye perceives different colors as being more or less visible, and that different ways of producing a beam may make it more of less visible in different situations. “Apparent Brightness” is another term used, which specifies the amount of “apparent” visibility the laser may offer. This also usually means the amount of power the laser modules will produce inside the laser housing. The “Maximum” output power usually means the amount of power the laser could produce if the modules are more powerful than their normal or typical power output.Īnother term is “Typical Output Power”.The “Minimum” output power usually means the amount of power the laser modules will produce inside of the laser housing (see diagram above).One term is Minimum/Maximum Output Power: There are some terms you might see that are used to describe laser power measurements. When this second method of defining a laser’s power is used, it is important for you as a customer to be able to correctly understand and interpret the amount of power your laser is capable of producing, at the output window. Typically, on the order of 15-30% of the power is lost inside the projector, as the beams travel through the optical path. The amount of power lost varies depending on the quality of the optics, the beam path design, and other factors. It could even be that the name or model number is unrelated to the laser power.īecause the beam must then go through combining optics and then bounce off steering and scanner mirrors, inevitably there will be some power lost before the beams finally exit through the output window. A projector called “Beautiful Laser 2500” could be 2500 mW (2.5 W) at some point in the beam path- or it could be less powerful. Similarly, the laser name or model number may or may not accurately reflect the power of the laser beam.It may also be done so that a limited range of labels needs to be printed and kept in stock for example, for use on lasers less than 1 watt, on lasers between 1 and 5 watts, on lasers between 5 and 10 watts, etc.) (This may be done to have an extra “safety factor”: e.g., treat the laser as if it were 5 watts. The label is true - the laser emits less than 5 watts - but the Warning/Danger label in this case is stating a power that the laser could not reach. In some cases, the Warning/Danger label’s stated power level may be well above the maximum the laser could ever put out.įor example, the label may state that the power is “<5 W” when the laser beam is only 2 watts. The Warning or Danger label required on laser equipment will state a power level which is at or above the maximum the laser could ever produce.To know the power of a laser projector, do NOT rely solely on the Warning/Danger label, or the model name/number. To give an example, 500 mW is the same as 1/2 watt. Laser power is measured in milliwatts or watts. Laserium® Laserist: Greatest Job on Earth.
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