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| 1. What is the difference between 635nm and 650nm? -They are identical including a high quality collimating lens except that the 635nm wavelength appears brighter to the human eye than the 650nm wavelength. The 635nm laser diodes are hard to produce and are seldom available. They are especially sought after by collectors and those instructors who teach in an environment of high ambient light.
2. You say that the lasers are true 5mW but the specifications rate the lasers between 1-5mW. How do you guarantee 5mW? I will be using the laser for diffraction pattern experiments at college and will be able to ascertain the wavelength then. Have you conducted any such test yourself? I'm only curious because I already own a similar laser that's rated between 3-5mW and it comes around 3.4mW. I am interested in buying a 5mW laser but I would like some reassurance? - See attached scan of my calibration certification. Each pointer is checked before shipping. Calibration certification
3. What's the difference between the APC and non-APC green lasers? - The APC pointers have a negative feedback circuit (APC = Automatic Power Control) that insures that the output power will not exceed 5mW. This makes them more suitable for indoor use. It has a small green LED placed just above the "ON" button to show when the pointer is radiating. You need to start with a unit that has a nominal output of say 10-15mW and incorporate a sensor after the MCA and send a voltage back to the driver circuit that will establish a "set point" that represents a certain output level. The driver circuit then adjusts the current to the pump diode to achieve that level. This is in addition to the photodiode that is in the pump diode assembly itself which is used to keep the pump diode from going crazy (chaotic non-linier device that it is). An additional benefit feedback with headroom has is that the device is no longer subject to the "cool-down" rule and may be kept on continuously.
4. Can the whole beam be seen on a regular green laser pointer? - If it is very dark the beam can be seen. These are the most visible pointers you can buy but they are not "light sabers". See attached picture sent by a customer showing the beam from a green laser pointer.
5. Do you think red laser will be visible at 50 feet in bright sunlight aimed against a stucco wall? - No. If this is a requirement, I think you need to consider green laser pointers.
6. I was wondering for the laser pointer ... in the dark, do you only see a dot or do you see a beam? - It has to be very dark or some smoke added - this goes for all of them. Please see attached picture sent by a customer showing the dot. For the beam, see question #3. Green Laser Dot
7. If
I use green laser pointer in the dark, will the beam itself be visible to
the naked eye?
8. Is the range of green laser pointer roughly 15,000 ft then ? if outdoors in darkness with few clouds? - Talking about range for these devices is pretty useless. A seller can say any "range" they want. It will be much farther than you will be able to see. What is important is the quality of the optics. Our pointers are superior in this regard.
9.
How
long will the green laser pointer work without having to change the batteries?
10. Could you give me safety information on laser pointers? - Here is a website that would be helpful: http://www.laserinstitute.org/
11. Could you give me more information about laser pointers? - Here's FDA Important Information about laser pointers: http://www.fda.gov/cdrh\radhealth/products/lpm.html
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