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Old 05-18-2010, 04:05 AM   #1
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Question what are nm?

ive been online looking for a new laser. i noticed that some 120mw lasers are more expensive than a 200mw because of the nm. can someone tell me why this is and what do the nm do to the laser? does it make it burn better? also, wha does nm mean? thanks, nick.
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Old 05-18-2010, 04:09 AM   #2
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Default Re: what are nm?

An 'nm' is a nanometer (1.0 x 10^-9) and it determines the wavelength of the laser, 650nm is red, 532nm is green (and near the peak of human eye-sensitivity), 473nm is blue, 405nm is a violet shade. Green lasers cost more because they're DPSS, as are blue lasers, but are far less inefficient.
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Old 05-18-2010, 04:09 AM   #3
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Default Re: what are nm?

Facepalm! Do some research. Have you heard of wikipedia?
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Old 05-18-2010, 04:11 AM   #4
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Default Re: what are nm?

Nano meters. itis the unit of measurement of seeing colours in the spectrum.it classifies the colour of the laser Eg Green is 532nm.
use the search button.
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Old 05-18-2010, 04:15 AM   #5
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Default Re: what are nm?

lol, okay. thanks. so all the nanometers mean is just the original color? i dont get why they just say "red IR filtered laser." lol, thanks guys
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Old 05-18-2010, 04:17 AM   #6
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Default Re: what are nm?

Unless they're talking about a DPSS red laser like 671nm then they just have no idea what they're talking about.
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Old 05-18-2010, 05:03 AM   #7
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Default Re: what are nm?

Quote:
Originally Posted by 1Nick View Post
lol, okay. thanks. so all the nanometers mean is just the original color? i dont get why they just say "red IR filtered laser." lol, thanks guys

Some lasers, called DPSS, use an IR diode to make the color. Because of this the lasers output can be mixed with the IR. IR is invisible, so you wont see it.

The problems of IR mixing with the colors are
1. It can give false power readings. If you buy a 200mW DPSS laser, and 150mW comes from IR, then you are not getting the full 200mW of color.
2. Because IR is invisible, if you caught a stray beam it will damage your eyes because you cant see it. Also if it did not have a filter, you would need goggles to protect you from the IR, along with goggles to protect you from the original color.

This is how companies produce cheap lasers. As stated above, a 200mW laser that is only producing 50mW of color is garbage. The better lasers have an IR filter, and produce a much higher color power. So the beams are brighter, and can burn more stuff.

The good thing is that IR filters are cheap, and somewhat easy to install. The bad part is if you have a cheap laser, it will cut the power in half in most cases. You want to buy from a company a laser that gives you a power reading with the filter.

The IR diode is referred as a pump diode in the diagram.


Last edited by Tech_Junkie; 05-18-2010 at 05:26 AM.
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Old 05-18-2010, 05:07 AM   #8
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Default Re: what are nm?

Nice link! I have a chart handy as well which shows the eye's sensitivity of the various wavelengths:
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Old 05-18-2010, 06:11 AM   #9
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Default Re: what are nm?

1Nick.. depending how long or short the wave of light is .. determines its color. Red is more spaced out while green is going to be shorter or tighter. You measure this with nanometers which is one billionth of a meter

Tiny right?
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Old 05-18-2010, 06:23 AM   #10
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Default Re: what are nm?

Quote:
Originally Posted by 1Nick View Post
lol, okay. thanks. so all the nanometers mean is just the original color? i dont get why they just say "red IR filtered laser." lol, thanks guys

also standard diode lasers (not dpss) do not emit ir because they are a single wave length....


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Old 05-18-2010, 08:02 AM   #11
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Default Re: what are nm?

The link isnt currently working, but I have seen it before in mfo's thread, it is a nice chart as well.
BTW: when you come across a pic you like, just right click it and save to the hard drive, then when you want to post it, just click the paper clip symbol and upload the pic.
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20mW rated 473nm PGL III-C outputing 55+mW and peaked at 96mWthanks Glenn!!
80mW rated 589nm PGL III-C
300mW rated 532nm PGL-III-C---Peak---450mW!!!

250mW labby from ebay---peaks near 300mW!


125mW viper DL-peak 188mW
50mW focusable ~Top laser 301-peak 44.12mW
Several modded pens 10 -30mW
*DIODE*
445nm diode pocket mini build, 700mA ~ 600mW---
445nm diode in 18650 kit---1.1A---1W

16X LCC chrome pckt mini, flex 500mA, outputting 303.2mW with G1
LOC with RKCSTR-- 434mA thanks FPyro-peak 305.1mW with G1
130mW 3.8mm diode pointer from moh-peak 140mW
635nm AtlasNova 5mW outputting 2mW
8X BH08LS20 diode in MX host 420mW with DFW lens thanks FPyro!!
SF-AW210 in jayrob pocket mini, flex drive 177mA~230mW with G1 glass
5mW ebaser with star cap puttin out 34mW
50mW focusable ~Top laser 302
200mW 808nm skylasers pointer-peak 291.2mW
*GAS*
Melles Griot He-Ne Bare Tube w/ mini PSU
JDS UNIPHASE 1508 Novette
Melles Griot Bare Tube HeNe w/ power supply
Cheap surplus Bare Tube HeNe
543nm Bare tube HeNe--Awesome tube!

Andover Holography LPM 1
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Old 05-18-2010, 08:05 AM   #12
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Default Re: what are nm?

this could have easily been achieved by the search button but hey we all do it
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Old 05-18-2010, 01:35 PM   #13
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Default Re: what are nm?

Quote:
Originally Posted by kingdave2357 View Post
...have a chart handy as well which shows the eye's sensitivity of the various wavelengths...
Oh man, now I've gotta get me a 589... I didn't realize that yellow was way up there...
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Old 05-18-2010, 03:00 PM   #14
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Default Re: what are nm?

Quote:
Originally Posted by CAM View Post
But yellows are very expensive and are usually a combination of a red and green beam.
Yes, they are expensive but no, they aren't "usually a combination"; most of the 589nm lasers we talk about around here are DPSS (and most have been purchased by way of a Glenn CNI GB )
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Old 05-18-2010, 03:52 PM   #15
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Default Re: what are nm?

traveller is correct... yellow is not at all usually a combi package... DPSS


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Old 05-18-2010, 10:55 PM   #16
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Default Re: what are nm?

Quote:
Originally Posted by Crazy Jay View Post
1Nick.. depending how long or short the wave of light is .. determines its color. Red is more spaced out while green is going to be shorter or tighter. You measure this with nanometers which is one billionth of a meter

Tiny right?
damn, that is small!
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