Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



Which Green Laser Should I Get (cost aside)?

Which diode is the best choice (cost aside)?

  • NDG7475

    Votes: 9 100.0%
  • NDG700

    Votes: 1 11.1%
  • NUGM01

    Votes: 1 11.1%

  • Total voters
    9

HydroSean

New member
Joined
Mar 25, 2016
Messages
529
Points
0
I am in the market for a new diode for my next build project. I want the highest power green laser diode which from my quick research is 1W. I noticed there are two 1W diodes and also a 700mW one. The two 1W ones are the NUGM01 and NDG7475 and the 700mW one is the NDG700, all are 520nm in wavelength. Has anyone had first hand experience with all three of these and if so what do you think are the pros and cons of each, differences?

Here are the links for each diode from DTR:

NDG7475

NDG700

NUGM01

All input is appreciated. :thanks:
 
Last edited:



CurtisOliver

Well-known member
LPF Site Supporter
Joined
Jun 12, 2015
Messages
6,881
Points
113
The NDG7475 is the best choice, as it nominally outputs around 1.4W along with the NUGM01T. They both cost around the same as well. But with the NDG7475, you have the additional lottery of bagging yourself a efficient 1.6W diode. But should be noted, that you shouldn't expect it. As for the NDG700, it isn't safe to run past 1W. Both the NDG7475 and the NUGM01T need appropriate heatsinking when overdriven.
 

RedCowboy

Well-known member
Joined
Jul 10, 2015
Messages
9,492
Points
113
NDG7475 is currently the strongest and has better divergence than the NUGM01 from what I have read.
 

Lifetime17

Well-known member
LPF Site Supporter
Joined
Dec 15, 2014
Messages
6,137
Points
113
Hi,
yes if this is your first 520 get the 7475 it won't let you down . I have all the 520's DTR sells and by far the 7475 is awesome. And yes it needs a host with good sinking nothing cheesy . Do it right it is a costly diode and be good to it, they are very bright and a beautiful WL..

Rich:)
 

BowtieGuy

Well-known member
LPF Site Supporter
Joined
Oct 14, 2012
Messages
6,090
Points
113
Agreed, definitely go with the NDG7475 if you can, although it probably won't be a lot more visible than the NDG700.
One other thing is that the NUGM01 has a Gball lens attached, and if you remove it to use a G-2 or similar lens for focusing, the diode becomes open can, and is much more susceptible to to damage.
 

HydroSean

New member
Joined
Mar 25, 2016
Messages
529
Points
0
Sounds good to me guys, looks like the NDG7475 is the clear winner. Does this diode get very hot quickly? Can you guys recommend a minimum heatsink size and duty cycle or compare how hot it gets as opposed to the NUBM44?
 

Sta

Well-known member
Joined
Jan 27, 2014
Messages
1,729
Points
83
Sounds good to me guys, looks like the NDG7475 is the clear winner. Does this diode get very hot quickly? Can you guys recommend a minimum heatsink size and duty cycle or compare how hot it gets as opposed to the NUBM44?
I just ran a quick test of my 7475 (2.4A, S4X host). After 1m 30s it got slightly warm, after 3m it was pretty warm but not hot. So the heatsinking problem is much less dire than that of the 44. I think it would be good for a Luke ROTJ build!
 

HydroSean

New member
Joined
Mar 25, 2016
Messages
529
Points
0
Does the NDG7475 have IR bands in its spectrum? I don't want to risk damaging my eyes so would it be worth it to put in an IR filter?
 

diachi

Well-known member
Joined
Feb 22, 2008
Messages
9,793
Points
113
Does the NDG7475 have IR bands in its spectrum? I don't want to risk damaging my eyes so would it be worth it to put in an IR filter?

Do you know how DPSS lasers work and the difference between DPSS and direct diode...? :confused:
 

CurtisOliver

Well-known member
LPF Site Supporter
Joined
Jun 12, 2015
Messages
6,881
Points
113
Hydrosean, Laser Diode & DPSS wiki links for your reference. Also have a look at this page for understanding what other types of laser there are.

This is a DPSS pointer.

compared to a diode based pointer.
 
Last edited:

HydroSean

New member
Joined
Mar 25, 2016
Messages
529
Points
0
I was thinking due to the many layers of semiconductors in the diode that there would possibly be additional bands in the spectrum. Seeing as how this is a high powered diode in all and most likely uses multi quantum states
 

CurtisOliver

Well-known member
LPF Site Supporter
Joined
Jun 12, 2015
Messages
6,881
Points
113
Whilst it is possible (more with the red diodes), it is unlikely to cause you a problem. The 520 diode is InGaN and primarily operates in the lower end of the spectrum. It is even less likely that a well made diode will output ir as well as visible. I haven't done too much research into diode technology but I'm sure most diodes don't output ir unless defective.
 




Top