Hi,
First of all I'm not a newbie to lasers, since I work with them for about 3 years now.
In the beginning I worked with fibre-coupled 808nm diodes of 1 watt, but I stopped those because I prefer to SEE something instead of visible IR.
Currently I use a 700mW 445nm blue laser on my portal cnc machine to engrave mostly dots and lines in wood.
This works nicely, but a 445nm laser is not a point source of light and focussing it is quite hard. If I want to focus to an acceptable small point, then I need to focus at less then 1" from my diode and lens and then I can burn small points of aproximately 0.2 mm size. These points are not points, but rectangles because thats the way how a 445nm focusses.
Yesterday I tried to focus my laser at a distance of for example 1 meter (3 a 4 foot) and while I managed to get a more or less small point, it was a lot bigger then what I needed to burn a spot on wood. I also read that on a 445nm this would be very hard to do.
What I want to do is have a laser beam go through a closed loop galvanometer at 20kpps and then throw the beam about 1mm away on wood. The galvo's deviate the beam and then I could position with that my beam and burn small dots.
Question: Can a 405nm blu-ray diode be focussed at a distance at a very small spot (445 cannot)
Question2: Are there also drivers for those 405nm which can source the needed current to the diode, but which can be turned on/off bij TTL or PWM?
I'm more or less looking to buy something like this.
Kind regards,
Bart
First of all I'm not a newbie to lasers, since I work with them for about 3 years now.
In the beginning I worked with fibre-coupled 808nm diodes of 1 watt, but I stopped those because I prefer to SEE something instead of visible IR.
Currently I use a 700mW 445nm blue laser on my portal cnc machine to engrave mostly dots and lines in wood.
This works nicely, but a 445nm laser is not a point source of light and focussing it is quite hard. If I want to focus to an acceptable small point, then I need to focus at less then 1" from my diode and lens and then I can burn small points of aproximately 0.2 mm size. These points are not points, but rectangles because thats the way how a 445nm focusses.
Yesterday I tried to focus my laser at a distance of for example 1 meter (3 a 4 foot) and while I managed to get a more or less small point, it was a lot bigger then what I needed to burn a spot on wood. I also read that on a 445nm this would be very hard to do.
What I want to do is have a laser beam go through a closed loop galvanometer at 20kpps and then throw the beam about 1mm away on wood. The galvo's deviate the beam and then I could position with that my beam and burn small dots.
Question: Can a 405nm blu-ray diode be focussed at a distance at a very small spot (445 cannot)
Question2: Are there also drivers for those 405nm which can source the needed current to the diode, but which can be turned on/off bij TTL or PWM?
I'm more or less looking to buy something like this.
Kind regards,
Bart