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Old 06-17-2014, 11:19 AM #17
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Default Re: Nichia 1.4W NDB7675 462nm Laser Diode

Just bought mine

Now in 2 weeks, I'll buy something to put it in


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Old 06-17-2014, 12:02 PM #18
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Default Re: Nichia 1.4W NDB7675 462nm Laser Diode

Quote:
Originally Posted by IWIRE View Post
Is it just my imagination or does this diode produce more heat than a 445nm driven at the same current ? It sure seems to get hotter quicker than my 2.3w 445 nm. Glad I used a host with a good heat sink.
As a general rule, the more inefficient the diode is the more heat it will dissipate when compared to a diode that displays higher output
at identical amperage (ie. one that is more efficient). Efficiency and wavelength are inversely proportional and since this diode exhibits
higher wavelength, naturally efficiency will be less.

Quote:
Originally Posted by ZRaffleticket View Post
I recently had a streak of some really terrible luck and I no longer have my 476/480, so I wanted the most suitable replacement
How did this happen!?!? My sincere condolences. I s'pose this diode is the next best thing

The more I look at everyone's build thread the more I want to buy one Resistance is futile

Last edited by will manners; 06-17-2014 at 12:36 PM. Reason: I need to learn how to splell :P
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Old 06-17-2014, 12:39 PM #19
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Default

Quote:
Originally Posted by will manners View Post

Efficiency and wavelength are inversely proportional and since this diode exhibits higher wavelength, naturally efficiency will be less.



The more I look at everyone's build thread the more I want to buy one Resistance is futile
Well it might be natural to you ! But I didn't know that
I know ignorance is no excuse. But it's the only one I got
Thanks for the explanation
Hey at least I noticed it seemed to get warmer faster

Might as well just order the thing. Stop tormenting yourself and step into the 462nm realm.
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Old 06-17-2014, 09:11 PM #20
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Default Re: Nichia 1.4W NDB7675 462nm Laser Diode

Quote:
Originally Posted by IWIRE View Post
Well it might be natural to you ! But I didn't know that
I know ignorance is no excuse. But it's the only one I got
Thanks for the explanation
Hey at least I noticed it seemed to get warmer faster

Might as well just order the thing. Stop tormenting yourself and step into the 462nm realm.
Heat is the defining factor behind red-shifting.

Thus, if the diode is more efficient, and more input goes to output light, rather than output heat, the diode will heat up less. Though this might only result in a delayed time before hitting the same temperature as a less efficient diode.
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405nm 500mW
442nm 15mW Melles Griot HeCd
445nm 1W
455nm 100mW LaserBTB
457nm Tunable OMNI 532
465nm Tunable OMNI 532
467nm 1.8W NDB7675
472nm Tunable Omni 532
473nm 2x 100mW Melles Griot lab heads w/ PSUs
476nm Tunable OMNI 532
488nm Single line 35mW
496nm Tunable OMNI 532
502nm Tunable OMNI 532
514nm Tunable OMNI 532
520nm 40mW MSV2
532nm Various pointers
543nm GreeNe 2mW
568nm ~20mW ArKr whitelight line
589nm 126mW PGL-III-C
594nm Rigel-6; 4.75mW + <1mW
604nm 2x <1mW multiline
609nm Ne Penning mixture Ar line from REO 612nm
612nm HeNe 1mW ML 4 line; Raman 6 line
629nm <1mW Raman 6 line
633nm 1-4mw red HeNe
635nm Raman 6 line
638nm 20mW single mode
640nm Raman 6 line
647nm ~10mW ArKr whitelight Kr line
650nm Raman 6 line
658nm LPC-826
685nm 20mW
808nm Modded NewWish pen


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Old 06-17-2014, 09:32 PM #21
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Default Re: Nichia 1.4W NDB7675 462nm Laser Diode

Quote:
Originally Posted by IWIRE View Post
Well it might be natural to you ! But I didn't know that
I know ignorance is no excuse. But it's the only one I got
Thanks for the explanation
Hey at least I noticed it seemed to get warmer faster

Might as well just order the thing. Stop tormenting yourself and step into the 462nm realm.
The minute I put mine on an LPM and saw its terrible efficiency (1.7W @ 2.4A) I smiled with glee because I knew the wavelength was higher. Sure enough, it clocks in just shy of 470nm at 469nm.
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Old 06-17-2014, 09:48 PM #22
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Default Re: Nichia 1.4W NDB7675 462nm Laser Diode

Quote:
Originally Posted by bloompyle View Post
Heat is the defining factor behind red-shifting.

Thus, if the diode is more efficient, and more input goes to output light, rather than output heat, the diode will heat up less. Though this might only result in a delayed time before hitting the same temperature as a less efficient diode.
Thanks for the info ! You guys teach me a little more each day ! The more I learn. The more I realize how little I know. REP +1

Quote:
Originally Posted by IsaacT View Post
The minute I put mine on an LPM and saw its terrible efficiency (1.7W @ 2.4A) I smiled with glee because I knew the wavelength was higher. Sure enough, it clocks in just shy of 470nm at 469nm.
I wish I knew what mine is. Spectrometers are out of my league right now. I priced some I swear my billfold started vibrating like a cell phone with fear
Mine must not be near as high as yours. With a G2 I'm getting a little over 2w at 2a
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Old 06-17-2014, 09:51 PM #23
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Default Re: Nichia 1.4W NDB7675 462nm Laser Diode

Quote:
Originally Posted by IWIRE View Post
Thanks for the info ! You guys teach me a little more each day ! The more I learn. The more I realize how little I know. REP +1


I wish I knew what mine is. Spectrometers are out of my league right now. I priced some I swear my billfold started vibrating like a cell phone with fear
Mine must not be near as high as yours. With a G2 I'm getting a little over 2w at 2a
Granted my 1.7W was with a 3 element, so I would get more with a G2 lens but I like the beam specs better of the 3 ele. You might message a few people and ask if they will measure it for you. You could also email your nearest university and ask them if they would allow you to spectro your laser or if a grad student could do it for you. I cannot afford a spectrometer, but Cyparagon was nice enough to do it for me. Universities are the best if you have one near you and they are willing to help you out. Just make sure it is calibrated.
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Old 06-17-2014, 10:16 PM #24
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Default Re: Nichia 1.4W NDB7675 462nm Laser Diode

Quote:
Originally Posted by IsaacT View Post
Granted my 1.7W was with a 3 element, so I would get more with a G2 lens but I like the beam specs better of the 3 ele. You might message a few people and ask if they will measure it for you. You could also email your nearest university and ask them if they would allow you to spectro your laser or if a grad student could do it for you. I cannot afford a spectrometer, but Cyparagon was nice enough to do it for me. Universities are the best if you have one near you and they are willing to help you out. Just make sure it is calibrated.
Thanks for the info. REP +1 We do some electrical work at one of the Universities here sometimes. That might be my in I don't know anyone that attends it. If not I might PM one of the members that can do it for me, when I get tired of trying to get good beam shots of it That thing is beautiful !
I haven't tried it with a 3 element, I have some, I'll have to try one on it.
I run a 3 element on the new 3.5w 445nm. I hate that beam with a G2. I like it with a 3 element
The 462nm beam really doesn't seem that bad to me. Granted I don't have the eye for beam quality that you guys have. I'm going to try a 3 element on it though
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Old 06-17-2014, 10:20 PM #25
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Default Re: Nichia 1.4W NDB7675 462nm Laser Diode

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Originally Posted by IWIRE View Post
Thanks for the info. REP +1 We do some electrical work at one of the Universities here sometimes. That might be my in I don't know anyone that attends it. If not I might PM one of the members that can do it for me, when I get tired of trying to get good beam shots of it That thing is beautiful !
I haven't tried it with a 3 element, I have some, I'll have to try one on it.
I run a 3 element on the new 3.5w 445nm. I hate that beam with a G2. I like it with a 3 element
The 462nm beam really doesn't seem that bad to me. Granted I don't have the eye for beam quality that you guys have. I'm going to try a 3 element on it though
I just find I get less splash. I hate splash so it works for me. I think you get a smaller diameter beam with a g lens but as we all know divergence is inversely proportional to beam diameter. So I'll stick with the 3ele for now. I do have a g lens though, I may try it out sometime. Thanks for the rep
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