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jomn12 · Apr 14, 2011

haha just kidding about the title but i got a quick question

ok ive bought some lasers before but nothing over 25 dollars
and now i want to buy something strong ive set my price range at 150 us dollars. Im looking at two different lasers a 200mw green priced at 150$ or a 600mw 445nm blue priced at 140$, both are from rayfoss.

since i am a noob it seems obvious to me that i should get the 600mw it is more power and its cheaper. but is there something I must be missing... why is the blue more powerful and cheaper than the green??

heres the link for the blue one
www.rayfoss.com

and i havent made up my mind on which green one i want they are all pretty much the same on ray foss

or if you guys know of a better laser for around that price or cheaper im looking for blue or green (im not interested in red)

thanks for the help

Eudaimonium · Apr 14, 2011

Green is a lot more complicated to produce, and higher powers are more difficult to achieve. Search for "DPSS lasers" for more info on that.

On the other hand, 445nm "blue" (are actually very deep blue with hint of purple-ish, pretty cool) are direct diode systems, which means you have a diode , and lens to collimate it and you're all done, no need for expensive crystals.

200mW green is aproximately as visible as 600mW 445nm, given that it's true 200mW of actual green light.

I cannot advise you on what should you get, both lasers will blow your mind out of sheer awesomeness. Personally I'd go for 200mW green since I have not yet seen 200mW of pure green in person, but I have seen a lot of 445nm lasers.

On the other hand, 445nm color is pretty exotic and, in my personal opinion, much more nicer and attractive than green which is already pretty "common".

icecruncher · Apr 14, 2011

If you are strictly talking power. Although the green has a lower output, the diode used to produce the green is probably much more powerful than the blue one. It's just running through a couple crystals to change freq. drops it significantly.

Green looks scarier to people who don't know. Your eye is more sensitive to the color

Eudaimonium · Apr 14, 2011

icecruncher said:
If you are strictly talking power. Although the green has a lower output, the diode used to produce the green is probably much more powerful than the blue one. It's just running through a couple crystals to change freq. drops it significantly.

Green looks scarier to people who don't know. Your eye is more sensitive to the color

What are you, abstract poem writer?

That what you just wrote makes apsolutely no sense. 808nm IR diode used to pump the DPSS crystals to obtain 532nm green is on average 5x more powerful than final output power as the conversion process yields about 20% efficiency.

So what? You can't use the diode's power in any way. To a user, it's completely non-existent and irrelevant, only thing that matters is the final output power.

And what you probably meant by last part is that human's eyes are a lot more sensitive to green color than blue. Not entirely true. There's photopic and scotopic vision.

Photopic is vision you have during day under normal illumination, where peak sensitivity of eye's cone cells is around 550-555nm.

Scotopic is vision you use during very dimly lit conditions, or no light at all, otherwise known as night vision. The peak sensitivity magically shifts down below 500nm, but rod cells used are overall less sensitive to color.

That's why you're virtually color blind in moonlight. And 600mW of 445nm will outshine 200mW of green by about twice.

Scotopic vision - Wikipedia, the free encyclopedia
Photopic vision - Wikipedia, the free encyclopedia

weeba2kv · Apr 14, 2011

That is so true what Eudaimonium wrote / gave ! +rep

JaiNobeZ · Apr 14, 2011

Lol @ thread title!

(Give a useless title, get a useless response :na

jomn12 · Apr 14, 2011

awesome thanks for the help
i think im gonna go for for the blue one

Bionic-Badger · Apr 14, 2011

Heeyyy.. before you get a laser over $25, or when you do, get some eye protection as well. With the blue, it can be dangerous to look at even the dot shining on a wall and both can instantly permanently damage your eyes if they reflect off something shiny and hit your eye.

icecruncher · Apr 14, 2011

Eudaimonium said:
What are you, abstract poem writer?

That what you just wrote makes apsolutely no sense. 808nm IR diode used to pump the DPSS crystals to obtain 532nm green is on average 5x more powerful than final output power as the conversion process yields about 20% efficiency.

So what? You can't use the diode's power in any way. To a user, it's completely non-existent and irrelevant, only thing that matters is the final output power.

And what you probably meant by last part is that human's eyes are a lot more sensitive to green color than blue. Not entirely true. There's photopic and scotopic vision.

Photopic is vision you have during day under normal illumination, where peak sensitivity of eye's cone cells is around 550-555nm.

Scotopic is vision you use during very dimly lit conditions, or no light at all, otherwise known as night vision. The peak sensitivity magically shifts down below 500nm, but rod cells used are overall less sensitive to color.

That's why you're virtually color blind in moonlight. And 600mW of 445nm will outshine 200mW of green by about twice.

Scotopic vision - Wikipedia, the free encyclopedia
Photopic vision - Wikipedia, the free encyclopedia

Thanks for trying to make me look like an idiot. I am perfectly capable of that on my own.

The guy asked "why is the blue more powerful and cheaper than the green?"

All I did was answer THAT question!

Boy, lighten up

, please!

Eudaimonium · Apr 14, 2011

icecruncher said:
All I did was answer THAT question!

No you didn't.

Your message was only decypherable to somebody who already knew everything about it, who could piece the words you thrown out together.

And I was not trying to make you look like an idiot, rather just clarifying what you said, just in a way anybody can understand.

Sorry if you took offence. It wasn't meant to be offendive.

jomn12 · Apr 16, 2011

Bionic-Badger said:
Heeyyy.. before you get a laser over $25, or when you do, get some eye protection as well. With the blue, it can be dangerous to look at even the dot shining on a wall and both can instantly permanently damage your eyes if they reflect off something shiny and hit your eye.

ohh i am,

i am buying two blue protective glasses one for me and the other for a room mate i am even considering getting 3 considering i have like 8 room mates

i am gonna buy from
Focalprice.com offers Protective Blue Laser Safety Glasses Goggles (Green) ,discount Protective Blue Laser Safety Glasses Goggles (Green),Protective Blue Laser Safety Glasses Goggles (Green) products,low price Protective Blue Laser Safety Glasses Gog
they have blue laser protection for US$5.34 unless you know of a better place for same or cheaper price

thanks for the heads up

budabob07 · Apr 18, 2011

Why buy a blue 445 nm laser @ 600 mW for $150 when you can make your own 445 nm @ > 1.4 W for around $50
Also,. those goggles don't look like they would protect you from a powerful 445 nm laser. First of all, most 445 nm glasses are orange. Second, those glasses don't list an optical density (OD) so you really have no way of telling how much of the beam they will protect you from. Third, they are only five bucks. Is your vision really worth only five dollars?

icecruncher · Apr 18, 2011

budabob07 said:
Why buy a blue 445 nm laser @ 600 mW for $150 when you can make your own 445 nm @ > 1.4 W for around $50

Lets try this again. You can get a 445nm diode for less than $50.00, but by the time you add the host, driver, lens, battery and maybe a charger You've got a lot more money in it.

budabob07 · Apr 18, 2011

icecruncher said:
budabob07 said:

Why buy a blue 445 nm laser @ 600 mW for $150 when you can make your own 445 nm @ > 1.4 W for around $50

Lets try this again. You can get a 445nm diode for less than $50.00, but by the time you add the host, driver, lens, battery and maybe a charger You've got a lot more money in it.

Click to expand...

Actually, I had a spare block of aluminum for a heatsink, and I built my driver instead of buying a flexdrive for a ripoff 35 bucks. So I only paid 50 for the whole thing

Click to expand...

Eudaimonium · Apr 19, 2011

Although FlexDrive has many advantages over anything DIY, it's still questionable choice to somebody on a budget.

Good work for going DIY, man

Do you have any pictures of your setup?

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