So I'm about to buy a Highly- Astronomy Military Zoom Green Laser Pointer Tactical Pen 5mW 532nm*but I saw a 5mW 405nm and I was just wondering what the difference is
So, the short answer to your question is the different wavelengths appear as different colors... 532nm is green and 405nm is violet. The green wavelengths are right in the center of the visible spectrum, so they are "easier" to see by the human eye. That being said, there is a good chance the 532nm pointer you are looking at will appear to be brighter than the 405nm even though they are advertised as both being 5mW. You may even be fortunate enough to see the beam in the night sky.
The real answer is for you to read the forum rules, stickies (especially those about laser safety and forum etiquette) , and make an introductory post in the appropriate section to let us know a little about yourself. Then, use the forum search tool and you will find there is a TON of information about your very question already posted here. Probably way more than you expect! This is a great forum with many active members who are very knowledgeable about laser operation and construction.
Enjoy your time here and again, welcome to the forum! Good luck with your purchase.
So I'm about to buy a Highly- Astronomy Military Zoom Green Laser Pointer Tactical Pen 5mW 532nm*but I saw a 5mW 405nm and I was just wondering what the difference is
The only way to find out is to buy and and test it with a LPM. But other than that, you can't find out. I'd say that the laser you are looking at would be around 30-100mw, so you will need safety goggles.
If you want a high-powered laser for a cheap price, I'd go with lazerer. I bought a green laser from amazon before and it was very low quality.
I see the word "astronomy" in your post. If you are using this laser for star pointing, you do NOT use safety goggles as the goggles intended job is to block a particular color.
Jerry, I'm an astronomer, too. For pointing purposes, you want a green laser not much brighter than 5 mW. Anything stronger and the brightness of the beam will destroy your nightvision.
I can not say a thing about the laser you ask about, however I can recommend Z-bolt's astronomy laser :