After a brief wait for delivery, I received the new Handheld Blue Laser in the mail. It was well packaged and the handheld laser was in a sturdy vinyl box. The box was covered in very nice leather-looking vinyl and containing a cut foam insert. However, the insert was cut for the body of the laser pointer without the battery cover attached. So, to store the handheld laser, you must remove the battery cover. Overall, this is not a critical issue, and removing the batteries from the Red Laser Pointer during storage is probably a good idea anyway. It requires a small amount of time to put the unit together before use and that could be an issue in low light levels. The case is large enough to hold the handheld laser with the battery cover attached and batteries inside, but the foam would need to be cut in the case to allow the handheld laser to be stored in one piece. Also included with the handheld laser was a lanyard with two keys to unlock the laser body, and a 3.5 mm tip sleeve plug that can be wired into a system that will allow remote operation of the laser. This PowerPoint presenter has a green laser pointer and a radio frequency USB receiver with built-in 8GB memory. Simply connect the receiver to the USB port of your computer and you can forward and backward slides by pressing the next and back buttons on the laser pointer. You can also save and get files from the receiver with 8GB memory. It uses built-in rechargeable Lithium battery, Supports PC and Mac. Comes with USB cable and luxurious gift box.
Laser light from laser pointers can potentially burn the retina of the human eye. The danger is obviously greatest if the beam is aimed directly into the eye, rather than merely scattered from the beam and seen from the side. The danger is dependent on the wavelength of the laser light, the power of the laser pointer, the divergence of the laser beam, the distance of the person from the pointer, whether the beam is seen directly or via a reflection, how long the beam is viewed and whether the human eye's natural 'blink response' to bright light occurs.The risk from a laser pointer is often also expressed by the 'class' of the laser pointer, although the definition is a little complicated and class definitions have changed in recent years. At one end of the scale, Class 1 laser pointers are safe for normal viewing. Eye damage from directly viewing the beam of a Class 2 laser pointer is usually avoided by the blink response. Class 3 laser pointers can damage an eye before it has time to blink and have the potential to cause eye injury, especially in the hands of a careless or untrained operator. Class 4 Astronomy laser pointer are even more dangerous, higher power devices.All of this stuff is housed in a sturdy pen-sized housing that holds everything in place and protects the innards from the weather and the operator. Don't try to take the pointer apart as this will void the warranty, as will removing the serial number sticker. Battery life depends on usage, but 2-3 hours of on-time during busy operation can be expected from two AA alkaline cells. Cold temeratures reduce the performance of the laser and batteries, so keep the pointer warm at the chilly star parties. The life of the Sony IR laser diode is about 4,000 hours, or something like 1,600 sets of batteries. The rest of the components will operate unless they are subjected to significant impact. Treat your laser pointer like you treat your eyepieces and it will last a lifetime. The final product of all this technology is a vividly bright green beam! At night, the beam appears to go all the way to the stars. When pointing out a faint fuzzy, folks within several yards of the pointer will clearly see the beam and the place you are pointing.
The handheld laser came with the laser body and battery end cap. Batteries were not provided so I immediately ordered two sets of UltraFire 16340 1200mAh 3.6V Lithium Ion batteries. While they were on order, I decided to buy a couple of Duracell 123 non-rechargeable lithium batteries to try it out. The 123 batteries were rated at 3V, but showed 3.2V when placed into service. Initial inspection of the handheld laser body indicated that it was made of aluminum and anodized in black coating. It is slightly more than 23mm (0.9”) in diameter, 184mm (7.25”) long, and weighs 172g (6.1 oz) with batteries installed. Although not heavy, this handheld laser has enough heft to keep you aware of what pocket you are keeping it in. The body of the laser has several labels containing information and warnings. The largest label on the body is placed right above the pressure activated one click on, one click off button. This label warns that this laser is intended for laser professionals and those over the age of 18 years old. It also clearly states the duty cycle of this laser at 5 to 10 min. of use, with at least a 1 min. rest period. The label also has an OSHA danger placard warning of direct exposure to the laser beam, and it stated wavelength range of 405 to 450 nm. A label below the locking system shows compliance with the FDA, RoHS, and CE Conformity. A white label right above the removable battery cap is printed with the model number and serial number for the handheld laser. Green Laser Pointer produce a beam of light that is coherent, monochromatic, and unidirectional, and can converge most of its radiant power over small areas, even at great distances. Laser pointers are useful ubiquitous devices used in everyday situations, especially in the educational environment. They are also used frequently by children as toys. Their potential to cause retinal damage is a matter of concern, and manufacturers warn against injudicious ocular exposure to laser light. Low-energy green laser pointers are generally considered to be safe devices and their potential to cause retinal damage is questionable. Here we report a case of macular damage caused by a green laser pointer in a teenager, along with a brief review of the literature.
The blink response should protect the human eye at any distance from any visible-light laser pointer beam with a power under 1 mW, typical of a Class 2 laser pointer. For laser pointers that are more powerful a greater distance is required to allow for blink response protection. For a given laser pointer beam, a quantity called the Nominal Ocular Hazard Distance (NOHD) can be calculated. Serious eye damage is probable within the NOHD and less likely at greater distances. The NOHD depends on the power, wavelength, divergence and diameter of the beam and the length of time the laser pointer beam will be viewed. For example, a 10 mW, collimated, continuous wave, green (532 nm) laser pointer beam with a diameter of 1 mm and divergence of 10-3 radian, being viewed directly for 10 seconds has a NOHD of 55 m. Clearly, this laser pointer, typical of many green laser pointers, is a potential hazard to someone close to it and should be used with care.Laser pointer devices are a common and essential part of everyday life. This may lead to an increasing number of exposures to this type of Blue Laser Pointer device. However, there is debate about the ocular risks posed by inadvertent exposure to standard laser pointer devices, with the presence of an actual laser-induced injury often inconclusive or entirely absent in some studies.1–3 Literature supporting laser pointer-induced retinal injury has been limited to only a few articles on class 3A red laser pointers, and even less literature exists on the retinal hazards of class 3A green laser pointers. In the literature, retinal lesions induced by laser pointers (both green and red devices) include foveal granularity, perifoveal drusenoid-like deposits, or foveal ring-shaped hypopigmented lesions, subretinal hemorrhage, vitreous or chorioretinal hemorrhage, retinal edema, scars in the pigment epithelium, and rarely choroidal neovascularization.
We performed quantitative measurements, showing that the weak unit emitted approximately 10 times more invisible IR light than the visible green. Green light activates the eye's blink reflex, which provides a protective mechanism. However, we are completely vulnerable to IR radiation, since exposure to it may only be noticed after significant retinal damage has occurred. After further investigation, we found that this problem is common in low-cost GLPs, although its seriousness varies widely. We propose a simple diagnostic method to detect IR radiation that requires only access to a common Web camera.Inexpensive GLP operation is based on three key elements, each of which marks a milestone in the history of laser technology. First, a semiconductor 808nm-wavelength diode laser pumps a neodymium-ion oscillator, which produces radiation at 1064nm.High powered green laser pointer’s light beams and dots are many times brighter than other laser pointers and are much more soothing to the eye. This makes them much more visible. In fact, you can see the actual high intensity laser beam, not just the small dot because of the power of green laser beams. When it is important that the laser dot is visible regardless of lighting a Laser Gloves is by far the best choice, and are surprisingly cheap. This is the reason why today’s astronomers, military personal, serious business professionals and educators use high powered green laser pens.Mini handheld green laser pointer pens come for sale in a variety of different power watts. The class ii or 1mw green laser pointer pens and class 3A 5mw green laser pointers are the safest to use. It is actually against US regulations to use green laser pointers that have high power laser beams over 5mw in public environment. Anything more powerful than class ii 1mw or 3A 5mw is not necessary for presentations or even armature astronomy. The laser beam and dots of class ii 1mw and 5mw green laser pointers are extremely powerful and visible in dark or light condition.