Blue Laser

[Isoleucine]

Oh I don't have a filter capacitor. All im doing is hooking the 9volt battery up to the driver, then from the driver, I will solder on the diode onto the driver board.

Oh and millirad, all I need to do left is to short the output pads in your previous post...

as in:
Solder on the diode and then connect the two output pads?

 

[archen]

Hey, I hope i'm posting in the right place, if not... let me know and i'll look around or start a new thread.

I'm new to lasers and my friend and I are trying to build a 405nm laser. We just bought the diodes from ebay and these are the specifications http://www.captainjacksonshoppingcenter.com/imagesForHongkong/laserdiode/100mwdatasheet.pdf

For quick reference, the threshold current is 40ma and the operating current should be about 100ma - 150ma.

We are building our own circuits, but we aren't sure if we absolutely need a focusing lens to get a visible beam/bright dot. Also, we aren't sure where or what type of focusing lens is needed.

 

[Eudaimonium]

Hey, I hope i'm posting in the right place, if not... let me know and i'll look around or start a new thread.

I'm new to lasers and my friend and I are trying to build a 405nm laser. We just bought the diodes from ebay and these are the specifications http://www.captainjacksonshoppingcenter.com/imagesForHongkong/laserdiode/100mwdatasheet.pdf

For quick reference, the threshold current is 40ma and the operating current should be about 100ma - 150ma.

We are building our own circuits, but we aren't sure if we absolutely need a focusing lens to get a visible beam/bright dot. Also, we aren't sure where or what type of focusing lens is needed.

Do not run at 120mA or more, will decrease life a lot.

Use:
AixiZ

I don't know why people think that there is a collimated beam coming from the diode. It's not. There is aproximately 40° in light emission in every angle from axiz where the diode is pointed.

Meaning that from 1 meter , "dot" is around 50cm on the wall.

Aixiz or similar diode housing is needed.

 

[qumefox]

Measuring current with the LD running is also the exact same method as using the dummy load. Simply put a 1 ohm resistor in series with the LD and measure across it. It's highly advisable to use a dummy load to set the initial current of the driver though. Don't want to hook up a LD with the driver accidentally set for a really high current.

 

[archen]

thanks!