Recent content by Bluefan

I haven't had much vacation, I've been quite busy with work for my master thesis. Usually I try to reply pretty soon even when I'm busy but the past few weeks were a bit of a mess. I've attached a photo of the puppy I'm working with, a large Coherent femtosecond laser system. The >10 meter long...

Glad to hear you're happy with the LPM! And thanks for the review! The actual name is Bluefan Basic LPM, although it's indeed a budget one ;)

The Bluefan Basic LPM has one strong advantage: Price. I think your point 3 is a bit funny, anti-reflection textured enclosure. The Newport 1825C is a nice little meter, I got one myself as well. What sensor do you have with it Jerry? I'm busy doing my graduation assignment (And I was at CERN...

Nice work Zartoop! A simple opamp amplifier circuit can make life easy by amplifying the signal to let millivolts correspond to milliwats, but if you're satisfied by just applying a conversion factor you already have a working power meter. Assuming TEC's and coatings are fully linear is...

busy pm'ing everybody ...

I have a few A140 diodes laying around from a somewhat older projector that I'm not doing anything with, so I'm selling of a few cheaply. They're unused, they only made like 2 hours when they were still inside the projector. I'm asking 25 euro excl shipping (and shipping diodes isn't expensive)...

Beam dumps have an optimized geometry to absorb as much of the incoming light. There has been quite some research to find the best "black" surface possible, shouldn't be that hard to find.

To add: the top of mount everest should be VERY hot if this were to be true :)

It depends on how high power you want, and it you want it CW or pulsed. Via Sam's laserfaq you can find various projects done by hobbyists, some have quite big lasers running. It's a rather big step to start with such big laser as first DIY project, maybe a smaller solid state laser from parts...

Multimode has a bit lower losses I think. The cable you link to has a 9um core diameter, which is multimode for 532nm, it's singlemode for 1550nm.

Very interesting, but you beam profiles measured are clipped, can you do additional measurements to cover those area's? That would show how the lens clips the beam which is important.

It makes a lousy beam expander as the fiber has a huge diameter and is thus horribly multimode. A DPSS laser has a very low M^2 value, so a single mode fiber (3~4um) would give a far better beam profile than this ~1mm diameter fiber without significantly higher losses.

This thread really grows fast. It really surprises me that it took 4 pages for people to realize the whole "copper for transfer aluminum for dissipation" is nonsense, transfer and dissipation all comes down to the heat conductivity. The volumetric heat only dampens the response of the system. I...

Electromagnetic radiation - Wikipedia, the free encyclopedia Saves me explaining what others have explained in detail :)

I'd say 4 or higher, higher OD's won't be a problem because the fluorescence gives away where the dot is.