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I plan to get a beam expander from Sanwu in the future or maybe I will build I out of 2 lens, a diverging lens and a collimating lens. Thanks for the tip though:)

Cool info! I heard about G8 lenses before but it does not seem as ubiquitous as G7 and is also more expensive. Furthermore when I bought the laser from sanwu, they did not offer G8 lenses so I had to stick with the G7. Maybe I would swap lenses to G8 in the future?

True.Multimode laser diodes have poorer divergence that single mode diode but I was really hoping it would be lower, perhaps less than 2mrad. Maybe I would try using the G8 lens as Paul1598419 suggested

Actually the laser use a G7 lens according to Sanwu when I email them about the type of lens they used on this laser. So I am not too sure why it has terrible beam divergence despite using a G7. Any ideas why?

No problem

I do not have the divergence measurement up to 30m, but this is my new calculated divergences. The one in the review is wrong and I have done the amendments. When distance = 0m, Diameter = 6mm; Test 1 : Dist = 9.136m Dia = 38mm Divergence = 3.5mrad Test 2 : Dist = 6.001m Dia = 20mm Divergence...

More host and beamshot pics for you to enjoy : G7 lens in the head of the laser Tailcap view of laser Host separated into 2 pieces AR coated G7 lens protector closeup Beam infinitely into the night sky More beamshot... Even more beamshots... SD-Laser 303 532nm(~95mW) VS Sanwu...

Thank you for your positive comment. I understand that Relying on my calculations to determine a safe distance to point the laser at is very dangerous as I may not have accounted for all the variables. Fortunately, I did not actually point my laser at any buildings. I said that I point the laser...

Very cool! Good job on the build quality:)

Introduction : Hello LPF, I decided to get my first Sanwu laser, a Challenger II multi-mode 3W 450nm laser, and would be reviewing it in this post. As I am a new member, my review may not meet some of your criteria so I hope you will not be too critical. Anyway, let's jump into the review:)...

Thank you for the advice hakzaw1. I have made the necessary amendments :)

For Sanwu multi mode laser, the Low power mode is 5mW or below thus is eye safe. Therefore, it is safe to use the laser as a pointing device at when set to Low power. Just make sure that you obey laser safety rules and everything should be fine.

Thank you 😊

Thankyou :) . Just a quick question as I am new, I notice many of the members in LPF have a list of the lasers that they own, colour coded, at the bottom their post. How did they do that?

I am from Singapore and I have been interested in lasers since I was about 8. I have experience in electronics as well as programming c++ . Currently, I own a couple of lasers including the common laser 303 as well as higher powered ones such as Sanwu challenger 3w and Chinese Gatling gun style...