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I have plenty of OCs, about 80 in fact. What are you looking for? Steve

Grey text is way too dark for older eyes.. Steve

You were saying? See attached.,. For the OP, a current review of laser spark plug research is: Laser ignition - Spark plug development and application in reciprocating engines Progress in Quantum Electronics Volume 58, March 2018, Pages 1-32 Fiber delivered laser spark plugs are coming...

I arranged for DZ to have a sweet little box of optics at SELEM. Don't want to steal his thunder, so stay tuned. Did see two line operation at one time while at SELEM. Steve

Before I sold it to my friend, I had a 55 mW unit on a spectrometer with 0.5 nm resolution. The lasing medium shifted center wavelength outside the classic three 1120 nm yag lines by 5 nm during warmup. It also had a lasing band about 3 nm wide centered on its moving center frequency. That...

For the guys who keep pounding me with PMs on how to shift the wavelength. Preliminary explanation It is very coating dependent and less pump diode dependent. To change colors you need to change what is reflected in BOTH the IR and the Visible. You also need to kill the competing lines by...

I know what it likely is now, will confirm when it gets here. Self doubling, broadly tunable, rare earth material. Pump is going to be out near 970-980 where most cheap spectrometers with silicon detectors are starting to be blind. There are other pump bands. There are four possible host...

That's known as a wavelength hop, not a sweep. Ours had a 5 nm slow sweep (linear change no winking) caused by index of refraction changes as the material heated up. There are some materials that self double.... for example NYAB. If I had to guess, this is going to possibly be pumped...

It is a process I've seen in other mediums. :-) I can tell that much from the pictures. However it is limited by thermal conductivity of the host crystal microcrystal. You will NOT be overdriving this low cost one much, its designed for low power. If I have time today I will have a friend...

I bet I get called a liar until some of these folks find out that ONE properly chosen crystal can adsorb the pump diode light, lase, wavelength shift the primary lasing line 100 nanometers from resonant Raman scattering, and frequency double, but not be the mythical "direct doubled diode"...

I had a high powered 561 one, but sold it to a friend who really wanted it. About 55 mw for 1.17 amps pumped. Wavelength shifted a few nm longer during warmup, as typical for some solid state materials with wide gain bandwidth. 3 mm beam diameter , about 1,1 mR. Hit around 55 mw. Not a...

On mine lasing started at 561.1 and slowly shifted to about 565 when warmed up. Its very coherent, and had a beautiful transverse mode. So it has a gain bandwidth of at least 5 nm. I sold it, and ordered a 575 immediately, so was in no hurry to reverse engineer it. I did see one discrete...

Take a pair of calipers, measure carefully the rod length and diameter in centimeters. Weigh it on an accurate gram scale. Weight divided by volume = density. YAG has a density of ~4.6 Phosphate type 750 laser glass has a density of about 2.4 , others have a density around 2.9 or so...

Re: B&Wtech 473nm unit / Spectrometer Mods & Info nearest NE lines from the database. 614.3062 nm 616.3593 618.2146 Steve.

I've installed ND:GLASS amplifiers. I know it quite well. The giveaway is it will lase around 1054 instead of 1064. It has, depending on mix, 30 to 50 nm of gain bandwidth which is the real reason it is used in big amplifiers. Due to thermal shock, and the low thermal conductivity of...

Density Grasshopper, Density. Measure the Density, not the hardness! It is almost certainly YAG, as ND: Glass has only really ever had one specific use in the last two decades in the laser industry. ND:Glass is used for it's wide gain bandwidth compared to ND:YAG. ND:Glass is used for...

Re: B&Wtech 473nm unit / Spectrometer Mods & Info Some Xenon lines, Angstroms 5116.46 5127.24 5162. 5164.39 5167.30 5185.85 5206.07 5245.27 5248.98 5251.89 Steve

Re: B&Wtech 473nm unit / Spectrometer Mods & Info Have some Neutral Neon numbers from the database, in Nanometers this time .. 456.8962 460.7284 462.3908 587.1792 587.2127 589.9114 591.8306 595.9200 598.7056 598.8897 600.0365 602.7263 615.6283...

Re: B&Wtech 473nm unit / Spectrometer Mods & Info Just remember gas plasma devices such as spectrum tubes have a negative Delta V characteristic, so they will need a ballast resistor anywhere from 4.7 Kilo Ohm to 56K Ohms depending on the lamp. Two to five watt wire wound or metal film...

Re: B&Wtech 473nm unit / Spectrometer Mods & Info Yes, and if you use a cruddy peak finding algorithm that second line really throws off your center frequency on calibration. That little bump of a second line, kept us on Ion lasers in the lab for another two years. When doing the...