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How are the beam specs for your 405nm 2W laser?

Also which spectrum of light excites the fluorescence molecules is entirely dependent on the molecule you are exciting. I know for many organic material 375nm does not work as well as 405nm. Perhaps you can tell us what dyes/molecules you are trying to excite?

Thanks I just saw engraving kit and didn’t understand why you need fluorescence . Although 405nm does induce fluorescence also.

What is the advantage of UV laser for engraving over 405nm which have very good beam specs usually. I also worry about the safety of lasers where you can’t see the beam.

On a side note they offer those standard Chinese 303 lasers, but basically verify their output for a higher cost. Frankly you are better off buying several of these lasers at a lower cost and keeping the best one for use. I lucked out and got an amazing pen DPSSL green laser with amazing beam...

I am very happy with my purchases from Sanwu lasers and they replaced a diode for me promptly and at no cost. You can also ask them for example what diodes provide the best beam specs if that is more important to you then pure power. They answered me correctly and provided TEM00 mode lasers with...

People have given you good advice and your questions all have been answered in previous post that you did not seem to research (for burning ability and power). I have bought from good companies and bad (including eBay and Laserpointerpro). The quality and price at Laser Pointer Pro is very hit...

I bought this laser or very similar model more than a year ago. I didn't measure the actual output power, but I have no doubt it is as advertise. I actually had to be careful pointing it on the deck or leaves (could start a fire). The case is actually heavy and feels very solid and it does seem...

Also you said you were going to use the lasers at night hiking so I doubt you will use safety glasses in the dark hiking.

Well any laser above 5mw can cause issues with your eye if you look directly into them. Green lasers tend to be safer in that they appear brighter and you are more aware of the intensity of the beam. Violet and red appear less bright at same power levels so you can think they are less dangerous...

I have every colour of the Sanwu Pocket lasers and like them all. I like that the red laser and violet laser are single mode. I like the blue and green lasers too for the colour. I was using a 50mw 520nm pocket laser for astronomy, but I replaced it with the 5mw Laserland pen style 510 laser...

Camera is not the same as the human eye and blues appear brighter on camera.

For night time use, I would go with green since it is bright at lower power so safer. Also, to see the beam at a distance divergence and collimation is important. The divergence of the green diodes can be good at lower powers, which will still appear bright. The blue lasers tend to have higher...

The frequency of the laser does effect the burning ability of the laser. Colour effects how much of the energy of the laser beam is absorbed by the material per the area illuminated. This is a complicated formula as it is dependant on the material being burnt. In general, I would expect low...

You have to be careful using those brightness calculators and what you mean by brighter. When I use my lasers for star pointing those brightness calculators don't say the whole story. Looking at a laser beam pointing into the sky is effected by how the laser is scattered in the atmosphere. This...

I have both the Sanwu Pocket 50mw 520nm green laser and the Laserlands 5mw 510mw Laser Pointer Pen (the small pen format). They both are green diode lasers and work in cold weather (I am in cold country Canada). The Sanwu Pocket laser is shorter and both fit in the Orion laser pen mount (I have...

You could be right Paul about the power of my Golden 2W 445nm O-like laser (Although I would be surprised if it were even 50% lower at the speed it sets things on fire). I was only comparing it against similar 445nm lasers I own that have been measured by others (and here on the forums). Also...

Steve perhaps if you did have a PhD in optical physic you might understand it could mean many things. I am not sure if they are talking about internal focus or they mean the beam diameter could be changed by buying an external beam expander. There are several other options and the pictures did...

Thanks for the replies guys. Good point Alaskan about the beam expander being available. O-Like doesn't even mention if the beam can be focused or not. Another good point about the duty cycle will be lower, but Jet Laser doesn't even quote the duty cycle for the PL-E mini. Also, the point about...