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Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Wow, I didn't realize this thread was going to become so popular!
To address some of the questions, in no particular order:
- Yes you can buy a diode 'bar' (ie, 19 or 40 element array) and carefully cleave it into a ton of small diodes. The issue is that they won't necessarily cleave in the correct direction, and in particular with the higher power bars there isn't much space between the emitters for error. I have done this successfully, and managed to repair a laser in need of a 1W c-mount diode by removing the fried diode, soldering on a poorly cleaved replacement, and I got close to full power out of it. All of the work was done under a stereo microscope, and yes it was quite tricky! For some details of a similar process see
- Yes the diode is clearly multimode, and no it does not have a FAC (fast axis correction) lens. The silver lens assembly glued on the didoe has a simple asphere lens which collimates the laser in the slow axis, and leave the fast axis to fend for itself (thus the terrible beam profile). The fast axis is dealt with in the fiber coupler assembly.
- This diode definitely should be doing more power, how much more I am not sure. The dark spots in the image of the emitter show that it has been damaged (I will try to post a picture of this later), and generally the power doesn't far well after this type of damage.
- I am hoping to put in a 1w 670nm diode that I have (it is on a c-mount, which is what the diode in these packages is mounted on internally, so it should be a 'simple' matter of removing the silver cover and bolting the fresh diode in). I may also try and couple it back into a fiber, although I am not sure what the transmission of the optics in the fiber coupler is at 670nm.
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
Oh wow, "...", this is as close to madness as it gets! I haven't dared to solder the diodes yet but I intend to do some laser soldering with them. At least I managed to ge the In solder, copper bars and a 60W TEC element. Safety goggles, anyone?
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Mystery laser diode
