Hi Jerry,
Thanks very much for those figures Do you by any chance happen to have any corresponding temperature figures? I'm wondering how effective that heatsink is at higher mW outputs without a TEC and or fan.
Hi Jerry,
Thanks very much for those figures Do you by any chance happen to have any corresponding temperature figures? I'm wondering how effective that heatsink is at higher mW outputs without a TEC and or fan.
I've had it run for about 15 minutes at over 800mW and the
heat sink only gets warm to the touch... I'm thinking of installing
a small CPU fan on it..
Jerry
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At similar powers I found that a fan was required. The z-bolt heatsink accepts 40mm fans..
Of course - otherwise meaningful measurements can't be made, the thing would mode hop faster than one could see any clear picture. But to stabilize it to within a few thousands of a degree for a longer term is pretty tough, as the power dissipation is much higher than for the red diodes, and probably I need to spice up my Tec drivers.
You mean for the movie? I guess that was around 16C. But in general the single mode zones depend strongly on the temperature and the particular diode as well, so one needs to make systematic current/temperature scans for each diode separately, to find its single mode spots.
I just did a test on the A140 445nm LD I got from Dan...
I installed it into an Aixiz Module using the same 405 G-1 lens
I used to test the A130 in Post #51 of this Thread..
It is also mounted in a Z-Bolt clam shell heat sink..
Here are my results...
I tested in 100mW increments and stopped at 1500mW..
I used an Opto Power Corporation OPC-PS4005 Laser
Diode Driver and our Newport 1825C LPM with a Thermopile
Sensor as the last test.
It is to be noted that on both tests the resolution of the
current was limited to 10mA so the readings indicated could
be 1 to 9 mA more...
Starts lasing @ 3.77V -- 7mW
050mW ---- 260mA ---- 3.82V
100mW ---- 300mA ---- 3.87V
200mW ---- 370mA ---- 3.95V
300mW ---- 440mA ---- 4.02V
400mW ---- 510mA ---- 4.08V
500mW ---- 580mA ---- 4.13V
600mW ---- 650mA ---- 4.17V
700mW ---- 720mA ---- 4.21V
800mW ---- 790mA ---- 4.25V
900mW ---- 880mA ---- 4.28V
1000mW -- 960mA ---- 4.31V
1100mW -- 1050mA --- 4.34V
1200mW -- 1150mA --- 4.36V
1300mW -- 1260mA --- 4.39V
1400mW -- 1380mA --- 4.42V
1500mW -- 1570mA --- 4.45V
The readings are a bit different from my A130 test... but that could
also be due to perhaps the A130 was a low end binned LD or the
A140 was an extremely high end binned LD...
To really know if the A140 LD are better we need more tests by
other members... The tests I performed are not destructive... and can
be done by anyone that has an LPM and DMM...
These tests will not blow your 445nm Laser Diode if you keep the tests
under 1200mW and follow a few standard safety measures... IMO
Once I find more time and more 445nm LDs I'll do some more of these
tests to get a better Average Idea of what these LDs are..
Jerry
Last edited by lasersbee; 07-03-2010 at 12:40. Reason: Value Correction
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