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O-like Green Labbie

Hemlock_Mike

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I was recently lucky enough to acquire one of the green labbies which Matt ( Mohrenberg) got from ebay. There are no part numbers on it and Matt assures me that is was originally from O-like --- No power ratings known.

Specs:

Laser head: 1.8" wide x 1.18" high x 3.42" long including fan
Pwr.Supply: 2.0" wide x 1.83" high x 4.34" long Much of this is heatsink
Input power: 130 VAC - 60 Hz
Modulation Port: TTL

The 12" cable between the PS and head has 8 large wires indicating that the head is likely TEC cooled. The power supply has two exposed 10 turn pots which I have not tried yet but I'm assuming control LD current and TEC setting. The Modulation port is a minature two pin plug and from testing is TTL as there appears to be no analog slope.

The laser powers up and stabilizes at ~150 mW after 20 seconds. I went to get a power measurement head and when I came back, a screwdriver handle was smoking!! Yes it has power.

This is all I know so far - I haven't measured divergence because weather here is getting bad :-( but the beam looks tight.



HMike
 

Hemlock_Mike

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OK - Then go buy one. It's that simple. or is this for count?

HMike


Untested observation: The TTL input appears "visually" to have a soft start feature which may limit its use in projos.
 
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Hemlock_Mike

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Sgt -- I'm not giving you any more pictures -- You would likely build something better !!!!
Just Kidding!!! This thing runs coollllll . The fan also seems to be controlled by the PS and remains stable at ~150 mW.

HMike

Also for projo use, the head appears to be electrically isolated from ground so we don't have to worry about the + case driver.
 
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I have several of those, and I think they're the best deal around currently for a TEC-stabilized green. The modulation response can be a little rough, but i don't expect too much from inexpensive Chinese..

Here's a link to the unit on o-like's website. They're rated at 100mW.
 
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Hemlock_Mike

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EF --

There seems to be an RC circuit in the TTL driver circuit which makes modulation a little slow. Also, what are the two 10 turn pots on the top board ued for?

HMike
 
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Only guessing here, but I would imagine one is TEC current and the other is diode current. In my experience, that's pretty much the standard configuration.. I might have to try fiddling with one of mine.
 

Hemlock_Mike

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So far, VR1 is LD current and VR2 is TEC.
VR1 has the most power control. It's slow to watch TEC effect.

HMike

Turning VR2, I assume TEC, CCW a little seems to let the power increase slowly. This may be over cooled. At a room temp of 67 Deg F, the laser housing is running at 73 Deg and the fan housing at 74 Deg. This using an IR temp meter.
 
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Hemlock_Mike

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Gains? -- Please define.
I've noticed that if I use the TTL to shut off the beam, The module may over cool in idle mode which cuts power until it warms up again which takes time.

HMike
 
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Sorry, I thought you were temp tuning it when you were messing with the pots, but you never said that was what ou were doing, so I may have assumed when I shouldn't have..
 

Hemlock_Mike

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VR1 is the obvious power control. VR2 appears to control the TEC and it's hard to adjust because of time lag and variables like that.

HMike
 
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A couple of mine do the same thing you were saying about the laser over-cooling when it's blanked for a bit.. That's actually what I meant be the modulation being rough.. If you come to a blank frame sequence that's too long, the laser takes a second to come back up.. Mine are all perfectly stable when running CW, though.
 
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