700mW 532nm handheld anyone??

Mine has the 2.5W diode, or at least I paid extra to get that diode and I trust that it is indeed that diode.

BUT let us pretend for a minute that it is only the 1.5W diode. It still only needed 1.1W to produce 375mW. If this is the case, regardless of what the current may or may not be, we KNOW that the diode was only putting out 1.1W. So it really doesn't matter which diode it is, or what current it is drawing, because the output power is still lower than BOTH of the different diodes used.

Today I am going to take the crystal set off again and will measure the raw pump diode output. I'm measuring 2.2A of current draw. I'm going to suspect that the pump diode is putting out between 2.2 and 2.4W.

The voltage across the diode and before the diode but after the driver is only ~1.8v. The overall voltage available is probably around 8v although I'm guessing it is a bit less because these batteries weren't full by any means.

beam shots please ;D

GooeyGus said:

So, since I added resistance in series the driver will just work harder to supply the same amount of current.

Click to expand...

How would you explain the tail cap's functionality? For the tail cap is exactly that - resistance in series.

I have a Optotronics RPL-425 that I tested. Something happens when I cross 5 volts. The current drops off a bit, then starts to climb again as the voltage continues to increase. Not sure what is happening at this point.
I repeated the test 3 times and it occurred each time.

Volts Current Draw (Amps)
3.0 .87
3.5 1.15
4.0 1.46
4.2 1.59
4.4 1.70
4.6 1.83
4.8 1.93
5.0 2.07
5.1 2.12 then drops to 1.81 within 3 seconds
5.2 1.87
5.3 1.93
5.4 1.99
5.5 2.08
5.6 2.16
5.7 2.21
5.8 2.28
5.9 2.31
6.0 2.34

Most of the heat buildup was in the handle opposite the switch. I presume this is where the driver is located. Tests were done with my lab grade digital power supply that can output to 6 amps.
Perhaps next week I can chart the output with my Coherent LaserCheck if anyone is interested. I know it is not the best equipment to measure with.
Next time I am wearing my eye protection. This this is bright!

Doug

Please do. I tried this and found that when measuring current and optical output, the optical output had decreased drastically as suggested by Justin.

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I have been unable to get consistent output readings with my LaserCheck. Perhaps the laser is mode hopping and output is unstable. The current drop I had observed before at 5.1 volts occured at 5.2 volts but the output did not seen to drop. I got 6 good readings between 5.0 to 5.2 volts and the output was holding at about 427mw.
I think better equipment and a controlled enviroment is needed to get and conclusive information on this.

Doug

I could not image with 700 MW