405 nm Diode dull?

[wolfhunter9154]

I recently purchaced a 150 mW laser doide and driver parts and it was working fine for a day but today I chenged the battery and when I did that the diode is dim now. (it was a brand new battery) any ideas?

 

[daguin]

I recently purchaced a 150 mW laser doide and driver parts and it was working fine for a day but today I chenged the battery and when I did that the diode is dull now. (it was a brand new battery) any ideas?

Links to what you got?

Current setting (mA)?

Type of batteries?

What is it mounted in?

Peace,
dave

 

[wolfhunter9154]

It is set to 50 mA with a 9v battery and I have the driver set up on a breadboard. This is what I got here

 

[daguin]

It is set to 50 mA with a 9v battery and I have the driver set up on a breadboard. This is what I got here

How did you measure the 50mA setting?

Did you try it with another, new battery?

Peace,
dave

 

[wolfhunter9154]

Yes Itried a new battery. I measured the mA on the circuit with a voltage tester. It might be something in the circuit but it was working fine a few minutes before.

 

[FireMyLaser]

Does it still draw 50mA? What is the voltage over the laser diode?

 

[daguin]

Yes Itried a new battery. I measured the mA on the circuit with a voltage tester. It might be something in the circuit but it was working fine a few minutes before.

Place your DMM in series with the battery and measure the current.

Peace,
dave

 

[wolfhunter9154]

Yes it still draws 50mA and the diode voltage is 4.89 v

 

[wolfhunter9154]

Place your DMM in series with the battery and measure the current.

Peace,
dave

What do you mean by DMM?

 

[FireMyLaser]

It has most probably turned into an LED, from ESD while changing battery.

 

[wolfhunter9154]

It has most probably turned into an LED, from ESD while changing battery.

Just curious but what would the esd be from?

 

[FireMyLaser]

From you.

 

[pseudolobster]

What do you mean by DMM?

Digital Multi-Meter. (a voltage/amperage/resistance tester)

Anyways, there's a few things that could have caused this... ESD, if you touched the diode pins without grounding yourself first, maybe you disconnected the diode momentarily when the driver was turned on, charging its capacitor to unsafe voltages, then when you hooked the diode back up it discharged into the diode, perhaps you shorted the resistor or potentiometer, sending the current up to 1500mA for a second, could be a reflection went back into the die causing catastrophic optical damage, or maybe it was just bad juju, and your diode is cursed.