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The use of laser pointers has become widespread. The pointers are useful and common tools for educators in the classroom and at conventions and meetings these days. However, laser pointers are meant to be safe when used for their intended purpose as a consumer product.

What is a laser pointer?

In a nutshell, a laser pointer (sometimes known as laser pen) is a compact, handheld laser device. This is typically used to highlight an object or point of interest by illuminating it with a bright spot of colored light. It operates by using an energy source to power a laser diode, which then emits a low-powered, coherent beam of visible light.

However, it is important that not all laser pointers are safe. It can cause retinal damage if it is shone into an eye, for example.

When was the laser pointer invented?

The pocket-sized laser pointers that we know today can be dated back to the 1980s. In 1958, Bell Labs researchers proposed a theory for creating lasers. Hughes Aircraft produced the first laser two years later, utilizing rubies, light, and mirrors to create the beam. The first semiconductor laser was then developed in 1962. This technology, also known as diode lasers, made laser pointers more affordable and accessible to the general public.

How does a laser pointer work ?

An energy source (also known as a pump), a laser (or gain) medium, and an optical resonator are all components of a laser. The pump essentially delivers energy, which the gain medium amplifies. This energy is transformed to light, which is reflected via the optical resonator before emitting the final output beam.

How powerful are Laser Pointers?

These are the tips to tell the strength of a handheld laser:

The pointer's output is likely less than 5 milliwatts if it's small and works on button batteries.

It's likely to be more powerful and exceed 5 milliwatts if it's pen-sized and operates on AA or AAA batteries.

If it's flashlight-sized and utilizes a cluster of AA or AAA batteries or lithium cells, it'll most likely have a power output of more than 5 milliwatts.

Batteries in pointers sold with battery chargers are prone to discharge quickly and be overpowered.

A detachable cover that spreads the beam into a pattern is included with some pointers. Without the cap, the beam becomes a single beam with a maximum power of 5 milliwatts.

Different laser powers have different colors -

The most common laser pointers are the red diodebeam. Other colors are becoming more available which include green and blue colors. The green

laser is of particular concern since the human eye is 50 times more sensitive to green light for the same power.

Laser pointers should only use red lasers with a wavelength of 633-690 nm. Outside of registered laser labs, laser pointers with a power of more than 5 mW are forbidden.

Green laser pointers should not be used due to the eye’s sensitivity to green light. Green lasers can provide a risk of IR exposure.

Color doesn't matter when it comes to eye damage risks. No matter what color the beam is, more milliwatts means more possible eye hazard.

Uses of laser pointer :

The most prevalent use of commercial laser pointers is to help presenters during lectures or corporate presentations.

The laser pointer beam will produce a little dot of light on whatever item it is focused at, making it a high-tech alternative to the retractable, metal pointer. It can be used to direct the audience's attention to a specific slide presentation point.

Other uses for pointers include aligning other lasers, laying pipes in construction, and serving as aiming devices for weapons.

Laser pointers are useful for a variety of functions, including corporate presentations, lectures, public speaking, and stargazing. This laser pointer can also be used for teaching indicator, outdoor hiking and more.

Laser pointers are utilized in a wide range of applications in the industrial, commercial, and consumer markets, including:

For educational and corporate presentations as pointing devices

For distance measurement and leveling in the workplace

Laser shows with special effects

In the event of an emergency, as a beacon

Sights for laser guns.

Misuse of laser pointer :

Laser pointers aren't meant to be toys! They are priced similarly to other electronic toys, and many parents and children treat them as such. When used appropriately as a visual or instructional tool, laser pointers are perfectly safe. When used incorrectly, they can cause substantial eye damage. However, when utilized incorrectly, even low-power lasers can create glare, flash-blindness, and afterimage difficulties.

Many people buy cheap pointers from nations with lax regulations, and these pointers have a very high output that could be hazardous to others. Most countries, however, do not have strict rules in terms of the output of the laser. 

At concerts and movie theaters, a member of the crowd may find it amusing to wave the laser dot around on the stage or on the screen. Misuse like this will backfire. Ordinary people are more likely to support laser pointer restrictions or bans when they are distracted, harassed, annoyed, or temporarily blinded.

Safety Guidelines :

- Laser pointers are approved for use as for classroom and lecture presentations. These laser pointers should be used in accordance with guidelines. Power level the laser light emitted from a laser pointer can not exceed 5 milliwatts (mW).

- All laser pointers should have clear warning labels. Pointers that emit <5 mW have a Caution label. Lasers over 5 mW should have a Danger label. Many pointers that do not have warning labels have not had a hazard analysis performed and may be more powerful than expected.

- All laser pointers must have an on/off switch that requires constant pressure from your finger to operate.

- Due to the eye’s sensitivity to green light, and also green lasers carry a risk of IR exposure, green laser pointers should not be used. Only red lasers pointers (633-690 nm) should be used.

- Never stare into the beam of a laser. Always point the laser away from an audience and keep your finger away from the power button when facing people.

- Avoid shining laser at shiny objects.

- Do not use collecting optics such as lenses or binoculars when using a laser pointer.

- Do not aim laser pointers at aircraft, buses or automobiles.

- Do not aim laser pointers within offices or at other buildings.

- Never aim at law enforcement officers or someone who may interpret the pointer as a laser aimed weapon.

In summary, much like the digital watches about 15 years ago, laser pointers have become very affordable recently due to new developments in laser technology. Laser pointers are helpful tools but they must be used responsibly. Common sense dictates that users should never direct a laser pointer beam at another person. And lasers with power over 5 mW should not be used as pointers.

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