Green beam specs

[trencheel303]

I prefer DPSS over diode to be honest. It's a far more interesting process with a nicer beam (assuming it's not acting up in some obscure TEM mode) and some great colours to boot. One of my 532nm pens has such a thin beam it looks like a glowing green needle. hard to measure but it's either 1mm or less in width. I think I got lucky with that one as my other green pen and my skylasers HL beams are XXXL size in comparison.

It's hard to say which laserbtb host I prefer but honestly for aesthetics and general use I think I definitely prefer the HL... but its heatsinking isn't as good as the PL (with the PL you can feel the heft towards the front of the laser) and for 300mW of green a PL might be better as the better heatsinking will lead to an overall more stable laser with longer run times. The pump diode for a 300mW 532 can't be that far off the same power as 1.6W 445 and even that heats my PL quite quickly. Others can comment but I imagine the HL would cook quite quickly.

 

[xirrious]

Im gonna get the PL host theb I think and also a bunch of eBay pens and hope I get a good one out of thirty or so lol

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[xirrious]

In had forgotten the diode in a dpss system is twice the output under the best conditions ... I have a pen with the needle beam and I love it but also beam width increases visibility.. relative to.viewing angle of course but for any given angle of observation a wider beam will by physical laws in turn has to have a higher visibility. Assuming all given scenarios are with a standard power output. Love my needle pen but it rarely produces anything close to a Gaussian beam aka TEM00. mode hops like a mofo

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[xirrious]

Tho my previous post isn't always true there is a range of variables that come into play but in general I think the above post can be taken as mostly correct. Pls correct me if I am mistaken

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[trencheel303]

In had forgotten the diode in a dpss system is twice the output under the best conditions ... I have a pen with the needle beam and I love it but also beam width increases visibility.. relative to.viewing angle of course but for any given angle of observation a wider beam will by physical laws in turn has to have a higher visibility. Assuming all given scenarios are with a standard power output. Love my needle pen but it rarely produces anything close to a Gaussian beam aka TEM00. mode hops like a mofo

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A pump diode will be a fair bit more than twice as powerful as the output, else we'd be seeing uncanny efficiency that'd make powers much higher than what we currently see.

I'm not sure on your observations re beam width. A thinner beam has more concentrated photons and will appear brighter than a fatter beam for a given power output. Think of it this way, if you shine a 445 at a wall 50 metres away the beam at the aperture will be easier to see than at the termination point where it has diverged considerably.

 

[xirrious]

Here is how I think of it... the beam is translucent now I know we are talking about light but any translucent material will become more opaque thus more visible with increasing thickness. If viewed perpendicularly two beams of the same power I believe the thinner beam must be less visible as it affects less particles n the air. Both our views are valid I believe and in fact the rayleigh effect may cancel out any difference in visibility.. im in over my head a bit so pls dont take my posts as arguments in any sense.. im just trying to understand the physics best I can

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[xirrious]

Think of it. The reason viewing angle changes visibility is because it effectively alters the thickness of the beam your viewing if that makes sense

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[trencheel303]

If I had an LPM I'd settle it... once and for all. but here's some food for thought.

I have three greens, my Skylasers HL, and two NewWish Pens. For now we'll count out one of the NewWish pens as it has a relatively phat beam and the dot isn't as bright as the other two.

The remaining two have reasonably thin beams, but the pen laser has a very thin needle like beam. The beam, when both lasers are warmed up and on good batteries, appears to be about as bright as that of my Skylasers HL. However, the dot is not as bright and the splash it makes can nowhere near light the room as effectively as the Skylasers HL. The pen also doesn't get anywhere near as warm as the Skylasers HL (over a given time period) and defocussed it can't hurt my skin as much or do as much burning. Without an LPM it's all speculative but we can make a "reasonable assumption" that the pen isn't as powerful as the HL... yet its beam rivals it

Also, viewing angle increases brightness because of the way the light is scattered. Light will reach your eyes easier parallel to the beam (i.e., directly behind the laser, or in front of it) rather than from the side.

I also forgot, I did this photo recently:

It's not as easy to tell in the photo, but even here you can see the fattened beams don't have as much apparent brightness as the ones raw from the laser.

 

[xirrious]

Your right and thankyou very much. I concede defeat lol. Im still going to research this as I want to know WHY also. But thanks.tons trencheel you answered one question for me at least. Im still new to the hobby and appreciate your positive feedback alot and you've helped me decide I'd trade power for beam diameter and divergence. My green pen has a needle thin beam and very low divergence but its like 5mw tops I want a lil more power lol

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[trencheel303]

Your right and thankyou very much. I concede defeat lol. Im still going to research this as I want to know WHY also. But thanks.tons trencheel you answered one question for me at least. Im still new to the hobby and appreciate your positive feedback alot

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You're welcome. I learn something new about lasers almost every day and enjoy imparting that information just as much. Better to educate and grow the community than put newcomers off by sending neg reps...!