25 Jan
2022
25 Jan
'22
10:05 p.m.
Hello List,
I just found a laser diode with a built-in photodetector in my home. I will play with it and report in the upcoming days. Since these are used in optical drives, they are supposed to be atom-cheap. What is evident right now is that the diode's temperature has to be controlled to keep the wavelength constant.
Regards,
Ferenc
On 1/25/22 21:42, Jacob Lifshay wrote:
On Tue, Jan 25, 2022, 12:05 David Lanzendörfer leviathan@libresilicon.com wrote:
Hi Ferenc Good point with the precision issue... Do you know of any good off-the-shelf laser distance measuring sensor which has a sufficient resolution for determining the exact distance (with an acceptable tolerance), so that we can do the fine adjustment?it isn't off-the-shelf but you could likely easily build one based off of laser-diode self-mixing: https://youtu.be/MUdro-6u2Zg
Jacob
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