275 reputation
21549
bio website 3.14.by
location Moscow, Russia
age 33
visits member for 4 years, 7 months
seen 2 days ago

Software developer (in love with C++). Hardware geek (FPGA's, STM32, AVR, crazy stuff from discrete components), love LED indicators (7-segment, alphanumeric). Trying to understand ASIC design & manufacturing better at the moment. Also, trying to wrap my head around lens design, but that is not going to be that easy.

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2d
comment What causes this IR emission in UV 365nm LED?
@boyfarrell You was right, apparently strong signals make sensor non-linear, so software processing was removing harmonics not perfectly.
2d
comment What causes this IR emission in UV 365nm LED?
It seems harmonic suppression is in software? Due to different sensitivity between IR and UV strong signals might saturate the sensor and make correct software processing impossible...
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comment What causes this IR emission in UV 365nm LED?
It appears there is indeed significant non-linearities involved when suppressing strong harmonics. Weaker signal somehow does not produce this "ghost" IR...
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comment What causes this IR emission in UV 365nm LED?
That was quite unusual... I was able to replicate the situation where IR peak was removed by IR-cut filter, but IR-pass (680nm+) filter does not show anything behind it...
2d
accepted What causes this IR emission in UV 365nm LED?
Jul
29
accepted Stimulated emission in Nd:silica glass, energy levels broadening and lasers
Jul
28
comment What causes this IR emission in UV 365nm LED?
Physics of 1064nm and 808nm leakage in 532nm lasers is completely clear to me (808nm diode pump, 1064nm from Nd:YVO4 not converted by non-linear crystal). In this case there is an LED, not a laser, so I am in doubt there might be something similar.
Jul
28
asked What causes this IR emission in UV 365nm LED?
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awarded  Notable Question
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awarded  Notable Question
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awarded  Popular Question
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awarded  Famous Question
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awarded  Popular Question
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awarded  Popular Question
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comment Can light emitting diodes be used to generate UV wavelengths?
Now 365nm LEDs are quite common, and even shorter-wavelength ones are available though very expensive.
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awarded  Notable Question
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answered diffraction grating
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awarded  Popular Question
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comment Spectrum of generic $\mathrm{CO_2}$ laser
I only have few ZnSe lenses. So for a rough spectrometer I still need suitable diffraction grating and detector. Regarding the specs - there are nothing else, Chinese manufacturers only care about raw output power, that's it. If it is only one line - that would already answer my question, but I am not sure it supposed to be 1 line without line selection.