Laser Pointer Prompts Serious Scare at High School, Kansas City, Kan.

The latest news reported by polices in Kansas City, Kan: Laser pointer owned by a student is wrongly pointed to people in inside Wyandotte High School Thursday morning. However, the false pointing of laser pointer has just led a false report of an armed person inside the high school.

Details issue of wrong operation of laser pointer in Wyandotte High School:

After receiving this news, teams of officers and sheriff’s deputies rush to the school at 25^th street and Minnesota Avenue after a student reported someone had a handgun with a laser site.

But after viewing surveillance video, police identified the reported “suspect” and determined the item was a laser pointer.

Caution with laser pointer:

Laser pointer is not any longer a toy, but a practical tool that is applicable in presentation, projection in scientific research, lab experiment, entertainment etc. However, laser pointer operator should always be cautious enough and never point it at other people, animals, moving vehicle, and aircraft.

Operating laser pointer is no kidding, but should be cautious enough with it all the time.

link source:http://blog.berlinlasers.com/2014/05/08/laser-pointer-prompts-serious-scare-at-high-school-kansas-city-kan/

Laser Pointer

Laser pointer is a kind of pen, portable or handheld designed laser devices manufactured from laser module (laser diode). Common laser pointers includes red (635nm, 650nm), green (515nm, 520nm, 532nm), blue violet (405nm), blue (445nm, 450nm, 460nm), yellow (589nm), infrared (808nm, 980nm) infrared laser pointers. Laser pointer is able to emit a long distance visible beam for presentation on targeted objects. However, it might corrupt or affect the workplace navigation objects, such as museum of art or zoo etc. Laser pointer is not recommended in these places.

History
The earliest laser pointer with a wavelength of 633nm is helium-neon (HeNe) gas laser, typically used to generate energy less than 1mW laser beam. The cheapest laser pointer uses red laser diode of wavelength close to 670/650nm. Slightly more expensive laser pointer uses 635nm red-orange laser diode, which is more easily identified by human eyes. There are also other color laser pointers such as 532nm green laser pointer is also available on the market. Early in 21st century, 5933.5nm yellow-orange laser pointer appeared, 473nm blue laser pointer appeared in Sep. 2005, and 405nm blue violet laser pointer appeared in 2010.

Features of laser pointers
Brightness
The irradiated laser light spot from laser pointer not only depends on the power and apparent brightness of surface reflectance of laser beam, also the color vision of the human eyes since human eyes are most sensitive to green light among wavelength range of 520nm-570nm. Human eyes have weaker sensitivity to blue or red light, thus green laser pointer seems brighter than other color lasers with the same power.

Power
Laser pointer power uses milliwatt. In United States, laser is classified by American National Standards Institute and U.S. Food and Drug Administration (FDA). Laser pointers are classified as below:
Class 2 or II: visible laser pointer (400-700nm) less than 1mW
Class 3A or IIIa: laser pointer among 1mW to 5mW
Class 3B/IIIB: laser pointer among power 5mW to 500mW
Class 4/IV: laser power up 500mW

Laser pointer classification
Red Laser Pointer or Red – Orange Laser Pointer
Red laser pointers are being designed with the simplest structure of 635nm or 650nm red laser diodes, easily operable by battery. Red laser pointer appears on the market in the early 21st century at low price and compact design, and 671nm DPSS red laser pointer appears at the same time. DPSS red laser technology assures high product quality and narrower band laser pointer.

Yellow Laser Pointer
593.5nm yellow laser pointer appeared in the early 21st century, available on basis of DPSS technology through a nonlinear crystal adding by 1064nm and 1342nm laser beam. The complex process has made yellow laser pointer inefficient and unstable, low output power of 1mW to 10mW. In addition, majority 593.5nm yellow laser pointers operate in pulse mode using a smaller size and low power pump diode.

Green Laser Pointer
Utilizing 808nm infrared laser excitation nonlinear crystal to produce 1064nm infrared laser light, and then multiplier produces 532nm green laser pointer, belongs to solid-state laser. Some green lasers operate in pulse or quasi-continuous mode to reduce cooling problem and prolong battery life.

Low power green laser pointer is visible even at night since scattering by atmospheric molecules. This laser device is often used for astronomy star and constellation pointing by astronomy enthusiasts or astronomers. 5mW green laser pointer (Class IIIa) is the safest laser for astronomy with visible beam in darkness. There is no need to select higher power laser for astronomy projection.

Blue Laser Pointer
473nm DPSS green laser pointer is low power and unstable. Early in 21st century, high power 445nm blue laser came in market usually in portable or handheld design. 460nm blue laser with the purest blue light is always available in pen design mainly used for projection.

Blue violet laser pointer
405nm blue violet laser pointer belongs to semiconductor laser, close to ultraviolet light, low visibility, but can stimulate fluorescence. It is applicable for paper money detection, chemicals test.

Laser Pointer Applications
Laser pointers are usually used as an eye-catching point in education, business presentation, and visual demonstrations.
● Red laser pointer can be used in almost any indoor or low light situations, pointing out details by hand may be convenient.
● Green laser pointer can be used for astronomy enthusiasts.
Green laser beam in moonless light, often can be seen clearly, accurately pointing out individual stars to others nearby. In addition, green laser pointer can be used by astronomers in astronomy lectures, which can direct a specific location of star or constellation accurately. Laser alignment is more easily by using eyepiece.
● Tour guide
Laser pointer makes convenient and rapid targeting of tentacles difficult objectives. It can accurately indicate target.
● Wide travelers and explorers
Laser pointers can be used in outdoor adventure, indicating distant targets and issuing distress signal to make travel more secure.
● Construction sites and mining field
Laser pointers makes precise instructions for remote buildings, avoids approaching the danger zone, and commander kilometer away field easily.
● Fire, rescue, help, and earthquake
Laser pointer is especially important in many emergency life-saving occasions.
● Entertainment
Low level power laser pointers can add good entertainment atmosphere in bars, gatherings.
● Industry lasers
Laser pointers can be used in industrial field. For instance, Construction Company may use high quality laser pointer in order to improve accuracy of specific distance from the display in large project.
● Scientific research
Laser pointers can also be applicable in scientific research field, such as photonics, chemistry, physics, and medicine and so on.

Laser pointer hazards and Laser Safety

● Laser pointer is harmful to human eyes. Never point lasers to human eyes directly, keep it away from child in order to avoid accidental injury. Please wear laser safety glasses while using a laser pointer indoor or close operation. Avoid direct eye stare at laser beams.

● Do not continuous light laser pointer too long (especially green laser), in summer no more than 30 seconds. Please stop laser pointer immediately if laser pointer feels hot until completely cooled.

● Green laser pointer may need to warm-up for some time in winter. It can be placed in a pocket to warm it up, put in battery, continuous light time is not more than one minute. It can prevent excessive aging of laser pointer or overheating to damage laser diode or laser module of laser pointers.
● Laser pointers cannot be used in the zoo for free frightened animal.
● Astronomy amateurs in the use of laser pointer for star pointing should not frequent and prolonged use of laser pointer, so as not to interfere with other people stargazing and photography.
● Stop using laser pointer in crowed public places in order to avoid harming others.
● High power laser pointers with significant thermal effects cannot be used continuously for a long time, especially for temperature sensitive solid state laser.
Article Resource: http://www.berlinlasers.com/laser-tech

980nm Infrared Laser Pointer

There have been a large kind of optical apparatus available on the market. However, unseen beam 980nm IR laser pointer is a very exceptional laser apparatus which is adept to supply the most exclusive infrared light source for occasions where unseen light source is required. For instance, 980nm IR laser pointer will be greatly applicable for military protecting against, scientific research, health remedy, astronomy etc.

As the outcome of longer wavelength than those of evident lightweight, 980nm IR laser pointer is able to task invisible emission in the light spectrum beyond the red light. This kind of exceptional 980nm infrared laser pointer has large effect of climate on the soil. 980nm IR laser pointer is emitting a large variety of power as well as unseen laser light projecting.

Not as visible as usually utilized evident laser in lightweight spectrum, 980nm IR laser pointer is playing a distinct function in everyday life. 980nm infrared laser pointer is mostly used as a great device for evening dream illumination. For example, evening dream devices are being used in pattern of near infrared illuminator. It supplies very wide evening variety for persons to make clear view or detection of people or animals without being discerned by other persons. The 980nm Infrared laser pointer conveys image through the kind of thermal transmission.

Military fighters will furthermore use this exceptional 980nm IR laser pointer in goal acquisition, surveillance, night vision, homing and following. It will help solider to make clear and unquestionable estimation and targeting of foes. The advanced submission of 980nm infrared laser pointer will substantially improves effectiveness of enemy detection on the genuine battlefield. This invisible infrared laser pointer is applicable for both infantry and civilian reasons. The infrared laser pointer is able to notice emery by sensor of human normal body temperature emission.

Not as visible as prescribed optical devices, human eyes have no feeling of lightweight emitting from 980nm IR laser pointer. It is especially unsafe if there is no safety assess of operating a high driven IR laser pointer. The 980nm infrared laser pointer will make direct blast to eyes, which can origin serious retina impairment such as temporary unseeing. As a matter of detail, laser operators should completely realize the danger of infrared laser pointer, and wear laser security goggles in order to hold safe use of this exclusive apparatus. Just let this gadget to be a genuine laser pointer device of evening hurter in work, but not a plaything in hands.

Dangers of Laser Pointer Directed At Aircraft

There have been a large quantity times when laser pointers are directed at airplane. It is quite unsafe one time laser pointers are directed at eyes of pilots. I will share some data of why it is harmful and how can it injure human.

How can laser pointer injure navigate?

Laser pointer is a kind of optic apparatus which is distinct from usual accessible commanded lights or sunlight. Laser light directed at airplane can be hazard. For example, the bright light emitting from laser pointer can cause disruption or provisional flash blindness to pilot. whereas there is only a very slim light beam projecting from laser pointer, the beam will become a very broad line of laser beam as the outcome of its beam divergence and fan bend. The big breadth beam from laser light can make emission while it is pointed on window, glass or bright objects on airplane or airplane. The echoed radiation from laser pointer will convey provisional blindness to pilot. It is far less likely, though still likely, that evident or inevident beam of laser light can cause permanent damage and hazard to human eyes.

What is the danger of laser pointer emitting to eyes?

The super brilliant visual consequences from laser pointers can bring for the time being divert or block of navigate dream. It is just the cause why optical lights are dangerous in atmosphere.

● Disruption and startle. The unforeseen light emitting from laser pointers can divert the pilot during evening time while airplane landing or takeoff. The navigate has no feeling of what is going to do under such status. They may be threaten while dazzled by brilliant laser light and lose control of feeling under such circumstance.

● Dazzling in strong laser beam. The provisional pointing of laser pointer might make a broad line of laser beam light on aircraft or airplane. With the increases of strong light brightness, it will hinder with vision of navigate. Night dream will be effected by the strong light emitting from the laser or brilliant light.

● Temporary blindness. Temporary flash blindness is recounted condition when the likeness takes from a couple of second to a couple of seconds to fade away. The provisional blindness will convey provisional visual disorders.

Safety assesses of laser pointer operation:

Pointing a laser pointer at pilot, airplane or airplane can be gravely dangerous and outcome in arrest, trails or prison judgments. At the same time, high driven laser pointer up 5mW is also ostracised in most of countries and states. Users should be careful enough while pointing laser pointers at evening, so as to prevent possibility when laser apparatus are directed at airplane or airplane. Pilots should be aware the information of laser hazards and be full acknowledgeable with rudimentary recovery procedures in case of laser light exposure. Let laser pointer to be your tool in your generally application areas, but not a tool for fighting to hurt other ones.