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



Laser Pointer Store

my handheld TEC-cooled ML501P73 almost finished

lasersbee

Well-known member
Joined
Sep 20, 2008
Messages
17,503
Likes
1,604
Points
113
Nice impressive test results... waiting for more
info when the TEC batteries are charged.
Hopefully you won't blow the LD..
Looks like cooling really helps output power.
Would have liked to know what the temperature
at the Diode was at 1455mW...

Jerry
 
Last edited:

Joined
Feb 21, 2016
Messages
475
Likes
273
Points
0
the thermometer shows around 1-2c at best after some time but i have installed the sensor on top of the diode heatsink instead of inside so i assume the real diode's temperature is around 0c or even minus numbers
 

Alaskan

Well-known member
Joined
Jan 29, 2014
Messages
10,570
Likes
1,609
Points
113
Is this normal for red laser diodes to be able to get that much more when chilled so low? If it is, I've got a TEC cooled array in my future.
 
Joined
Feb 21, 2016
Messages
475
Likes
273
Points
0
Is this normal for red laser diodes to be able to get that much more when chilled so low? If it is, I've got a TEC cooled array in my future.
yes it actually is and also those 639nm diode can change a bit the wavelengh with lower temperatures thats why i wanted to make a tec cooled laser
 

Alaskan

Well-known member
Joined
Jan 29, 2014
Messages
10,570
Likes
1,609
Points
113
Four years hanging out here and I didn't know the power out could be pushed that much more when TEC Cooled!
 
Joined
Feb 21, 2016
Messages
475
Likes
273
Points
0
i did the final tests,at 1,4A without cooling i got the reading of 1270mw and at this point i turned on the tec and the output start climbing till it hit 1485mw


after that i pushed the current at 1.5A just to see the results and i got 1522mw :wave:
 

Attachments

CurtisOliver

Well-known member
Joined
Jun 12, 2015
Messages
6,203
Likes
1,686
Points
113
You've stumbled on something great there. Nice! :)
3x the rated power, probably with the wavelength staying low too.
 

Alaskan

Well-known member
Joined
Jan 29, 2014
Messages
10,570
Likes
1,609
Points
113
Now my question is how long will the diode last at 1270 mw without cooling, and 1500+ with.
 
Joined
Feb 21, 2016
Messages
475
Likes
273
Points
0
i don't really know the lifespan at those currents but if someone makes a build that high at least those diodes are not very expensive those days :)
 

Alaskan

Well-known member
Joined
Jan 29, 2014
Messages
10,570
Likes
1,609
Points
113
When you shine that laser on the wall, do you have some laser goggles you could use to take a photo of the spot through so we can see its shape?
 
Joined
Feb 21, 2016
Messages
475
Likes
273
Points
0
its defenetly almost the same with DTR's images,the 2 element lens has the same spot shape but its abit smaller.to be honest you can't have it all with those diodes,you either have have better beam-low power or the opposite.
 




Top