Can someone with one of the laser sensors from the store here compare their beam spread to mine and let me know if I should have Maurice send me a replacement or if its the same as mine. On the green laser sensors you can adjust the focus on the laser by twisting the front piece.That seems very unusual for a laser as its supposed to be focused and collimated (roughly parallel). That said, I actually looked for awhile to find a laser with bad focus. The previous version had much better focus, but I found the bad focus makes it much easier to align a laser trigger. 

The projected dot of a laser will increase in size the farther it is projected. Laser divergence is measured in milliradians (mrad).The measure of angular spread of a line-generating laser. The angular measurement of laser beam spread with distance. The fan angle determines the line length produced at a certain distance. CALPAC line-generating lasers have a 90¡ã fan angle. Laser is an acronym for Light Amplification by Stimulated Emission of Radiation.

After poking around the internet a bit, It seems like 1.2-1.5mrad is a typical value for laser pointer beam divergence. This is my first laser project and I'm going to be building a mid power blue laser. I've already aquired my laser diode and have tested it using a my own little test rig. I was a little surprised that lasers require focusing optics (first time remember). Is this true, or are the stats I found from really cheap low quality laser optics?I'm looking to output 100-200mw.

The spread laser light was perfect. Laser light at 658nm is much more beautiful than at the HeNe's 633nm. It is an intoxicating red beam, compred to the HeNe's somewhat more yellowish-red. This would be a great diode for small laser light shows.A laser diode capable of large-format holography for just slightly over $100 (this module was actually closer to $500 with the coated anamorphic prisms, collimator and adjustable driver). 

It's only when they're old enough to afford the more expensive and more powerful Laser Cutter that naughty teens can become a threat. The incident you described is EXACTLY the sort of thing that has triggered the crackdown on laser pointers being sold around the world. For the beam to do any optical damage on a typical 5mw laser pointer, it needs to be fairly narrow or it needs to be magnified by other optics. The Sharper Image stores in America no longer carry laser pointers for this very reason.

Beoause the batteries that accompany the laser pointers are small and have short useable life, we generally remove the battery housing as well, and connect the laser to two Dbatteries in series. This will provide many hours of stable operation with extended laser life.By using 2 D-batteries which provides 3.0 volts (instead of the maximum intended 4.5volts), a stable 3 milliwatts power output is obtained. The spectrum of yellow laser light is between the wavelengths of 589nm ~ 594nm.

Yellow-orange burning laser blue , at 593.5 nm, later became available. In September 2005 handheld blue laser pointers at 473 nm became available.For the same optical power, green laser light will seem brighter than other colors.The apparent brightness of a spot from a laser beam depends on the optical power of the laser, the reflectivity of the surface, and the chromatic response of the human eye. Visible laser pointers (400¨C700 nm) operating at less than 1 mW power are Class 2 or II.

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