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Anyone working in Photonics?

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Terry Bites:
Loads of photonics applications in medical imaging and diagnostics. Cutting Edge Giga buck industry!

jpanhalt:
More than 50 years ago, I chose photochemistry for an advanced degree.  Never regretted it; although, that is not what I ended up doing.  I know photonics is different, but if your uni offers it and you have the time, I recommend at least one advanced course in chemistry.

PartialDischarge:

--- Quote from: jpanhalt on March 21, 2021, 05:00:23 pm --- I know photonics is different, but if your uni offers it and you have the time, I recommend at least one advanced course in chemistry.

--- End quote ---

Chemistry in this field is quite important for things like waveguides, resonators or interferometers... right now I'm reading about the opto-electrical uses of LiNbO3...

mawyatt:

--- Quote from: MasterTech on March 21, 2021, 09:07:52 pm ---Chemistry in this field is quite important for things like waveguides, resonators or interferometers... right now I'm reading about the opto-electrical uses of LiNbO3...

--- End quote ---

Used LiNbO3 in an optical Serrodyne Phase Modulator in early precision Fiber Optic Gyros (Patent 5339055). The optical phase modulator is driven with a waveform that ideally produces a true optical frequency shift of the laser diode without introducing harmonics or spurs. This optical frequency shift was used to "Close the Loop" of the precision Fiber Gyro to get away from the interference pattern offset sinusoidal effects and force the operation at the sine mid-point crossing where the waveform is perfectly linear (see Sagnac effect). Reading (counting) the forcing function (variable frequency for VCO) produced a linear relationship between VCO frequency and rotation rate. LiNbO3 is a very useful Electro-Optical material with beneficial voltage controlled properties.

Best,

JohnnyMalaria:

--- Quote from: mawyatt on March 21, 2021, 09:56:17 pm ---LiNbO3 is a very useful Electro-Optical material with beneficial voltage controlled properties.

--- End quote ---

Indeed. I've used acousto-optic modulators made with it (as well as other that use flint glass or lead molybdate). In my application, I use two to derive a precise, stable and known frequency difference of the order of a few kHz between two laser beams. They combine to create a kind of interferometer to detect nanoparticle motion.

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