rhd
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2,000mW "Silver Sabre" - High-Wavelength (455nm) Build
This is one of the two twins I wrote about here:
http://laserpointerforums.com/f65/sabre-twins-power-wavelength-binned-twin-445s-71534.html
I built two lasers using this host, one binned for the highest efficiency diode, and one binned for the highest wavelength diode. This is the build that uses a diode that was cherry picked for wavelength. It was the highest wavelength of several dozen tested. It measures in at 455nm. It's amazing how much brightness the high wavelength adds here. I mentioned this in the original thread, but it bears repeating - you can _definitely_ tell the difference in colour vs a 445nm equivalent (which is what the black twin was). This 455nm is a gorgeous blue, and a very very highly visible wavelength. I'll discuss relative brightness "science" a bit below, but subjectively this is just flat out the brightest beam I have seen. As I mentioned in the original thread, this build seemed a tad bit brighter than the 2,600mW 445nm build.
The build is focusable, and includes a G2 lens in a custom focus adapter. It's quite stable at 2W when measured on my Ophir. It runs on 2x 26650 lithium ion cells. You should be able to get several hours of run time from the capacity in a single charge. If for some reason you're dead set on using 18650s, they'll work just fine in this build, you just need to use spacers. Spacers can be ordered online from a number of sources for about $2, or you can improvise. I would of course recommend sticking with good 26650 cells, but I realize that most of us have 18650s coming out of our shoes already. Shipping lithium ion batteries is prohibited by the postal system for non-ground shipping, so please don't ask. However, I can recommend some GREAT cells, at a decent price here.
I have some ethical reservations about pointing you to a wavelength comparison tool that I created, so I'll preface this by saying that there is a lot of debate about how well relative brightness calculations hold up in the real world, and there are certainly people who just flat out don't trust the CIE data or Raleigh scattering formulas that they're based on. But for whatever it's worth (and I'll let you decide that), my relative brightness tool suggests that 2.0W of 455nm light should look about as bright as either 2.3W or 2.9W of 445nm light (the difference depends on whether you use the original CIE tables, or the Judd-vos revision):
Relative Perceived Brightness Calculator - 445nm vs 455nm (CIE 1931 data)
Relative Perceived Brightness Calculator - 445nm vs 455nm (Judd-Vos data)
10% of the sale price will be donated to Rob. See here:
http://laserpointerforums.com/f37/all-members-please-read-72009.html
You MUST own laser protection goggles appropriate for this wavelength, and
You MUST be over 20 years of age, and
You MUST be familiar and experienced with the appropriate safety precautions to take with lasers of this power.
This is not a laser pointing device. At all times, protective laser safety glasses appropriate for this wavelength must be worn by the operator. This laser should not be used around 3rd parties (non-operators) pets, or for any recreational purpose.
This laser is meant to be used as a portable calibration laser light source for LPM (laser power meter) sensors and meter systems. In order to ensure the most reliable calibration for your system, it is prudent to use multiple calibration lasers, representing multiple wavelengths, as well as multiple output powers, spanning the range of an LPM sensor's working detection range.
This is one of the two twins I wrote about here:
http://laserpointerforums.com/f65/sabre-twins-power-wavelength-binned-twin-445s-71534.html
I built two lasers using this host, one binned for the highest efficiency diode, and one binned for the highest wavelength diode. This is the build that uses a diode that was cherry picked for wavelength. It was the highest wavelength of several dozen tested. It measures in at 455nm. It's amazing how much brightness the high wavelength adds here. I mentioned this in the original thread, but it bears repeating - you can _definitely_ tell the difference in colour vs a 445nm equivalent (which is what the black twin was). This 455nm is a gorgeous blue, and a very very highly visible wavelength. I'll discuss relative brightness "science" a bit below, but subjectively this is just flat out the brightest beam I have seen. As I mentioned in the original thread, this build seemed a tad bit brighter than the 2,600mW 445nm build.
The build is focusable, and includes a G2 lens in a custom focus adapter. It's quite stable at 2W when measured on my Ophir. It runs on 2x 26650 lithium ion cells. You should be able to get several hours of run time from the capacity in a single charge. If for some reason you're dead set on using 18650s, they'll work just fine in this build, you just need to use spacers. Spacers can be ordered online from a number of sources for about $2, or you can improvise. I would of course recommend sticking with good 26650 cells, but I realize that most of us have 18650s coming out of our shoes already. Shipping lithium ion batteries is prohibited by the postal system for non-ground shipping, so please don't ask. However, I can recommend some GREAT cells, at a decent price here.
I have some ethical reservations about pointing you to a wavelength comparison tool that I created, so I'll preface this by saying that there is a lot of debate about how well relative brightness calculations hold up in the real world, and there are certainly people who just flat out don't trust the CIE data or Raleigh scattering formulas that they're based on. But for whatever it's worth (and I'll let you decide that), my relative brightness tool suggests that 2.0W of 455nm light should look about as bright as either 2.3W or 2.9W of 445nm light (the difference depends on whether you use the original CIE tables, or the Judd-vos revision):
Relative Perceived Brightness Calculator - 445nm vs 455nm (CIE 1931 data)
Relative Perceived Brightness Calculator - 445nm vs 455nm (Judd-Vos data)
10% of the sale price will be donated to Rob. See here:
http://laserpointerforums.com/f37/all-members-please-read-72009.html
You MUST own laser protection goggles appropriate for this wavelength, and
You MUST be over 20 years of age, and
You MUST be familiar and experienced with the appropriate safety precautions to take with lasers of this power.
This is not a laser pointing device. At all times, protective laser safety glasses appropriate for this wavelength must be worn by the operator. This laser should not be used around 3rd parties (non-operators) pets, or for any recreational purpose.
This laser is meant to be used as a portable calibration laser light source for LPM (laser power meter) sensors and meter systems. In order to ensure the most reliable calibration for your system, it is prudent to use multiple calibration lasers, representing multiple wavelengths, as well as multiple output powers, spanning the range of an LPM sensor's working detection range.
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