295 reputation
21650
bio website 3.14.by
location Moscow, Russia
age 33
visits member for 4 years, 8 months
seen Aug 30 at 3:31

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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Aug
25
awarded  Enlightened
Aug
25
awarded  Nice Answer
Jul
30
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.
Jul
30
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...
Jul
30
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...
Jul
30
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...
Jul
30
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?
Jul
6
awarded  Notable Question
Jun
29
awarded  Notable Question
Jun
28
awarded  Popular Question
Jun
20
awarded  Famous Question
Apr
11
awarded  Popular Question
Mar
9
awarded  Popular Question
Feb
15
awarded  Popular Question
Feb
15
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.
Jan
5
awarded  Notable Question
Dec
7
answered diffraction grating