- Joined
- Feb 12, 2016
- Messages
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- 63
These new Nichia MDP blocks are very addictive, they made me totally stop my projects of last years with combining all diodes in NUBM08/44 blocks into one strong low divergency beam, and now I want to check if it is possible to combine 2 or 4 of these NUBM31/36 and obtain 200-400W beam packs.
I do not like newer NUBM36/38 because I think that too congested beams would bring more power density on PBS and mirors - so I prefer to start these experiments with less power-dense emitter chips.
Apart of finding a decent 1000W capable driver the question was how to combine these packs in a way we earlier did with single diodes.
I took a dismantled mini party fridge from ali (this was purchased years ago to make a big ice cooled knd of heatsink), cut a hole in plastic and attached to its vessel a 170x100 mm Al plate with holes to install NUBM36 blocks both vertically and horizontally. I did not want to make it all durty with Arctic silver, so between Al plate and the vessel for ice there is 0.1 mm Indium foil.
This week I have finally received the big 1" PBS cube ordered 2 months ago (this one did not come from Germany but from a cheap optic shop on ali), because the pack would not fit into a smaler 20mm PBS cube I had (only pack from NUBM38 could).
Positive points of this idea:
- no need for waveplate in this set up because the packs are not perfect anyway...
- the combined output will be symmetric unlike two non-symmetrical rectangular inputs.
Then a miror, 40mm kinematic mount, and a pair of custom made Al pieces to position mirror and PBS exactly in the centers of the beam packs. The rest of set up design was like others I did: two 60mm Thorlabs cages side by side.
Now at the wall 5m away you can see pictures of 2 spots and then 1 spot when both are combined. Without filling the vessel with ice I only have tried beaming on for 30 sec at 1A, not at full power. The PBS did not seem to get hot, so this may work at 3A as well.
Later I want to do a knife edging experiment as well... to be continued
I do not like newer NUBM36/38 because I think that too congested beams would bring more power density on PBS and mirors - so I prefer to start these experiments with less power-dense emitter chips.
Apart of finding a decent 1000W capable driver the question was how to combine these packs in a way we earlier did with single diodes.
I took a dismantled mini party fridge from ali (this was purchased years ago to make a big ice cooled knd of heatsink), cut a hole in plastic and attached to its vessel a 170x100 mm Al plate with holes to install NUBM36 blocks both vertically and horizontally. I did not want to make it all durty with Arctic silver, so between Al plate and the vessel for ice there is 0.1 mm Indium foil.
This week I have finally received the big 1" PBS cube ordered 2 months ago (this one did not come from Germany but from a cheap optic shop on ali), because the pack would not fit into a smaler 20mm PBS cube I had (only pack from NUBM38 could).
Positive points of this idea:
- no need for waveplate in this set up because the packs are not perfect anyway...
- the combined output will be symmetric unlike two non-symmetrical rectangular inputs.
Then a miror, 40mm kinematic mount, and a pair of custom made Al pieces to position mirror and PBS exactly in the centers of the beam packs. The rest of set up design was like others I did: two 60mm Thorlabs cages side by side.
Now at the wall 5m away you can see pictures of 2 spots and then 1 spot when both are combined. Without filling the vessel with ice I only have tried beaming on for 30 sec at 1A, not at full power. The PBS did not seem to get hot, so this may work at 3A as well.
Later I want to do a knife edging experiment as well... to be continued
