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It depends by community. What is cyan (█) on a computer is called blue by many people around the world. East asian countries even call █ blue, except when it is █ and grows. Being grown up with computers with BASIC and EGA colors, I definitely won't call █ blue, and am borderline hesitant of...

Sounds like me Sounds like me I'd be willing to be added to this list, but I can forecast that I'll be gone for stretches of many months, possibly years, while still staying interested int he laser scene and willing to help you fellows.

Guess those Chinese don't like the Japanese. Naku is Japanese for Cry (also bird cry, often used when inflected differently, and the first syllable in deceased)

Noone else notice 317718 is "billie" up-side-down?

Our spectrometer is fitted with a cylindrical lens on the linear CCD to mitigate exactly this problem.

Indeed. Depending on the grating you could have for example a 500lines/mm grating with a bandwidth of 1000nm but only 1.5nm effective resolution, or a 2400lines/mm with 100nm bandwidth that has 0.15nm resolution. The bandwidth stems from where the first order rainbow starts overlapping the...

No, the spectrometer is calibrated on 25 wavelengths, all within 0.2nm (0.1nm typically). There are 4 calibration coefficients (cubic curve) with an R value of 0.999995. The resolution you speak of is 0.36 at 188nm and 0.45 at 1036nm (non-linear as you said). The spectrometer is going back for a...

See my edits. I did not see your reply as I kept refreshing page 1 and I also didn't see it pop up in my subscriptions (probably because the system thought I read the reply when I refreshed page 1) I think heat sinking is adequate. When I keep it running in the closed Aixiz for half an hour I...

Any old black felt-tip might work. I used a DVD permanent marker.

How and at what current did you measure the wavelength? I'm measuring 509nm at 108mA with no lens. :cryyy: Edit: I did a reference test with a DPSS 532 (those don't drift much, right?) at 30°C it measures 533.85nm. The calibration sheet of the spectrometer is from 2014 and all wavelengths from...

Received the SB217HL91 : 505.0nm . After some electronics yoga it's looking good. That mess at the diode pins looks better in 3D. Pins are fully intact because I don't mutilate diodes.

What mode? :oops: - Zom-B

Not steampunk enough :eg:

Make it or so that you can't accidentally turn it on. But the downside is, maybe it will attract kids.

SB217HL91. PM. Fix your /quote ;)

Someone should really update the laser wiki because there's so much information that keeps being re-asked. You mean the HL vs HN? And how is lower threshold = higher max? Only because the rest of the specs is the same and there's less thermal loss? If all things are equal, I'll take the new...

Do you know the recommended drive current? I'll take a 505nm if that's the wavelength at the recommended current (which one doesn't matter) btw wasn't the SB217HL91 supposed to be more like 502nm? Are these just the high tail of the bell curve and you kept the remaining three to yourself...

So the M140 CAN levitate despite idiotically inconvenient beam profile. It doesn't even matter if the long or short axis is horizontal. It does matter that I choose a power setting at which the beam looks somewhat gaussian. If I switch the power to max while levitating (using a switch, not a...

This procedure works wonders! I forgot I have my MXDL at work to be wavelength-tested, so I had to do with an LPC-826 and a crappy driver bringing it to 180mW. Levitating Sharpie-particles is so easy!! I was able to levitate new particles down to 50mW, and just below that it instantly loses any...

"Widely use in industrial and LAB !" - This made me crack. Sounds worse than something off aliexpress.