- Joined
- Feb 12, 2016
- Messages
- 589
- Points
- 63
Here I have finished the long expected device to combine 4 beams from Sharp GH04W10AGC diodes in the old fashioned Lasertack micro-KE beam combiner!
These are not new diodes DTR is selling now but still the old ones what Hakzaw extracted for me from used Junktronix modules.
Old fashioned I mean because LT does not produce combiners any more with offset of 3 mm. The new modules are for combining like IIII. But with the old one I can do the beam geometry
II
II
and this is better for later focusing and cylindrical correction than IIII shape would be.
The story was that:
First - I have connected all diodes in series and tried to arrange the beams with mirror prisms rated for 400-480nm which I have been using all the way for NUBM44 and NUBM08 but these ones did not reflect well these 405-410nm beams (pic. 2). Probably because at this range limit the reflection efficiency was too sensitive to beam polarisation... so Alex Schatalow from Lasertack has sent me the replacement - new prisms rated especially for 390-440nm free of charge. Thank you Alex!!!
Second - the oval holes in the mirror mount bases were not long enough - I drilled them to elongate a little to be able to install prism mirrors almost at the bottom - 0.5mm high from the baseplate. In this way more of the reflected upper beams were passing over the bottom prisms. The whole was mounted on the Al box for electronic components having the size to insert 2 cubes of ice. I tried this with Ushio red diodes earlier and this trick helped to keep them at room temperature over 10 minutes working time or such.
Once mirrors adjusted the spot at 5m distance is about 1cm long. At 0.1-0.2A it looks as a line but at 1A becomes thicker. The wall paint still does not burn at this power.
These are not new diodes DTR is selling now but still the old ones what Hakzaw extracted for me from used Junktronix modules.
Old fashioned I mean because LT does not produce combiners any more with offset of 3 mm. The new modules are for combining like IIII. But with the old one I can do the beam geometry
II
II
and this is better for later focusing and cylindrical correction than IIII shape would be.
The story was that:
First - I have connected all diodes in series and tried to arrange the beams with mirror prisms rated for 400-480nm which I have been using all the way for NUBM44 and NUBM08 but these ones did not reflect well these 405-410nm beams (pic. 2). Probably because at this range limit the reflection efficiency was too sensitive to beam polarisation... so Alex Schatalow from Lasertack has sent me the replacement - new prisms rated especially for 390-440nm free of charge. Thank you Alex!!!
Second - the oval holes in the mirror mount bases were not long enough - I drilled them to elongate a little to be able to install prism mirrors almost at the bottom - 0.5mm high from the baseplate. In this way more of the reflected upper beams were passing over the bottom prisms. The whole was mounted on the Al box for electronic components having the size to insert 2 cubes of ice. I tried this with Ushio red diodes earlier and this trick helped to keep them at room temperature over 10 minutes working time or such.
Once mirrors adjusted the spot at 5m distance is about 1cm long. At 0.1-0.2A it looks as a line but at 1A becomes thicker. The wall paint still does not burn at this power.
Attachments
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1 serial connection.jpg806.4 KB · Views: 30
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2 450nm mirrors.jpg783.7 KB · Views: 32
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3 extended hole.jpg451.9 KB · Views: 31
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4 405nm mirrors.jpg522.2 KB · Views: 32
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5 box lid.jpg597 KB · Views: 31
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6 beams stack.jpg556.9 KB · Views: 31
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7 beams stack 0.1A.jpg398.7 KB · Views: 32
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8 5m 0.2A.jpg660.6 KB · Views: 30
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9 5m 1A.jpg501.8 KB · Views: 29