Why There Are NO Yellow Light Laser Diodes? Green, Red, Blue... No Yellow?

Why there are NO yellow light laser diodes? Green, Red, Blue... No Yellow?

It has to do with the wavelength of light that has to do with laser energy being generated. Apparently it's not possible, or at least currently possible to generate laser energy in the yellow spectrum. I know this from experience working with, and operating surgical lasers. Hope this helps somewhat.

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Help with glass diodes, ST41 is the only marking

Unfortunately some parts of your description did not translate well, and so cannot be understood to use the "value" in that part of the story.However, overall I suspect (at least) one mistake is that you bought replacement diodes:the ones i bought where some 3.3v zeners diodesHowever diodes which are labelled "ST 41" (and, perhaps have additional numbers like "48" further round the diode body) are likely to be standard silicon small-signal diodes, not zeners. If you supply your reverse-engineered schematic, and if it is clear enough, then perhaps readers may be able to confirm/deny whether a zener diode would make sense in any of the locations where you used them.It is very unlikely that all of the (6?) glass diodes in your photo are zeners, so using zeners for all of those will have been wrong. It is possible (IMHO likely) that none of them should be zeners.

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How does ESD protection work with TVS diodes?

If you consider what the 8 kV ESD really is in terms of energy storage devices and resistors it will look something like this: -Picture from here.The 150 pF capacitor is charged to 8,000 volts but, your target circuit does not actually receive that voltage directly; there is a 330 ohm resistor in the way. That means the peak current delivered can be up to 24. 24 amps. So, when that hits the circuit node called "pin 1", D2 is forward biased and takes the brunt of the 24 amp spike and passes it through to the 6 volt DC bus. If the capacitance on your DC bus is (say) 100 uF, the voltage starts rising at this rate: -$$I = CdfracdVdtLongrightarrow dfracdVdt = dfrac24.24text A100text uF = 242,240 text volts/sec$$But, the CR time for the pulse is only 330 x 150 E-12 = 50 ns and so, the voltage might rise only 12 mV in those 50 ns. Taking this to extremes you could not really see the voltage rising much more than 0.1 volts before the ESD pulse has evaporated to nothing.But how much voltage does the diode drop when taking 24 amps? It will be 1 or 2 volts depending on the diode so, the maximum voltage that might be seen on pin 1 could be as high as 8. 1 volts AND D1 (the other diode) will remain reverse biased with no harm.Of course, 8.1 volts might still do serious harm to your pin so, most folk would have a 1 kohm resistor to the outside world from where your diodes are (see R1 below). This then restricts the current to 8000/1330 amps = 6 amps. The knock on effect should be clear. Even so, it does not guarantee the avoidance of circuit failure and, in addition to the 1 kohm mentioned above, another 1 kohm resistor is placed directly in series with the input pin. The 2nd resistor (R2) makes use of the chip's data sheet that would inform you what the maximum current is that could be injected without harm.The ESD discharge can also be negative, in which case D1 takes the brunt of the current and passes it (more safely) to ground. Also, if pin 1 is an output, you might not be able to live with a couple of kohm of extra resistors and different measures have to be taken

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What is the difference between infrared and laser diodes?

Infrared is a frequency (or identically a wavelength) range on the spectrum of electro-magnetic radiation, ranging from just above visible red at 700 nm for near IR all the way up to 1 mm radiation in the far infrared portion of the spectrum, right before microwaves. IR is between visible light and microwave radiation wavelengths.Laser diodes are semiconductor lasers, or laser chips so to speak. The movement of electrons (charges) across semiconductor charge barriers form charge vacancies that when filled again emit photons that resonate between 2 polished surfaces that act as mirrors in the laser cavity and emit a laser beam through one of these partially reflecting mirrored surfaces. There are many types of lasers from small quantum dot lasers to laser diodes to tunable high energy free electron lasers - laser diodes are just one of these types.What is the difference between infrared and laser diodes?.

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