power supply for green dpss laser

[ters]

ok here it is... im from the philippines, bought this in manila...

around php1500 (USD33)

my 1st green dpss laser...

more pics next.. still uploading

 

[ters]

output of this LP, im not sure.. it says <50mW output.. on the sticker...

 

[ters]

front side... the "defraction grating"? removed...

another view

inside view.. pot at upper lefthand corner(not clearly shown)

will post schema of voltage regulator next..need to draw it

 

[lasersbee]

I restate what I posted earlier.....

Yeah... that's normal for a cheaper Green pointer... the Xtals are probably
heating up... that's one reason why Laser Pens have a short on time...

Jerry

 

[ters]

and HERE is the schematic I used...

so...should I just use battery and dismiss the idea using an external PS?

 

[ters]

I restate what I posted earlier.....

that's one reason why Laser Pens have a short on time...

Jerry

what do you mean short on time? like I should only turn it ON for a FEW seconds at a time? or does this mean SHORT lifetime?

 

[lasersbee]

and HERE is the schematic I used...

so...should I just use battery and dismiss the idea using an external PS?

That circuit should work (it outputs 3.08volts)..
My problem with that is that you need to drop 9 volts and that translates into the
regulator heating up getting rid of the voltage drop...

Jerry

 

[lasersbee]

[quote author=lasersbee link=1237096269/16#19 date=1237216738]I restate what I posted earlier.....

that's one reason why Laser Pens have a short on time...

Jerry

what do you mean short on time? like I should only turn it ON for a FEW seconds at a time?  or does this mean SHORT lifetime?  [/quote]

I mean that you Laser Pointer will use a short ON time then a longer OFF time (to let the Xtals
cool down... and so on...
It is also called a "duty cycle"...

Jerry

 

[ters]

I mean that you Laser Pointer will use a short ON time then a longer OFF time (to let the Xtals
cool down... and so on...
It is also called a "duty cycle"...

Jerry

oh ok.. I thought short lifespan..cuz that would REALLY suck! now I get it.. lol sorry for the ignorance..

thanks for clearing that up jerry..

btw, since you mentioned duty cycle, I was wondering CAN I DRIVE this LP with PWM?? heheh I mean power given to the LD(and driver) is PWMd? is this correct? im just asking..

hhmmmm you said duty cylce

 

[ters]

Jerry,

what happens IF I continuously power my green dpss laser with external powersupply? say 5 mins... will the crystal GET damaged?