LPF Site Supporter
- Jun 12, 2015
Thanks 18LJ, I’m bookmarking that
Nice reference site.Ya i didnt anticipate anyone would be able to pull this off without access to some legit lab equip. i just thought maybe it would be helpful/ give ideas maybe cuz ur the first person ive seen in awhile try and pull of a temp wl shift. Plus its 2021 & about damn time we start seeing some orange around here!
your getting real close to orange! i should make one of theese thingsHello Guys!
I did it! I managed to fire the thing up. First without vacuum. I got down to a promising -40°C! I didn't measure the wavelength at this stage. However it already looked like a deep orange.
View attachment 73152
Next step: connecting the vacuum pump. The pump I currently have, only gets me down to 2mBar, not nearly enough to make the thermal insulation nice and good. However its better than nothing.
Turning the pump on made the temperature plummet. I got down to -62°C!!!
I got the spectrometer and started measuring.
View attachment 73151
Low and behold, I already got 621,5nm!
Thats only 14,5nm down from the start, with around 87k temperature difference.
That makes the drift around 0,166nm/k.
So getting to the maximum of the tec I am currently using (100k difference) would make that wavelength to around 619,3nm. Using the better but more expensive 5 stage tec with 120k delta gives me 616,08nm.
Using the 633nm diode to start with would give me 613nm! Just like my first prediction. Nice that everything works out.
I will get a better vacuum pump this weekend. I will see how good this gets.
This is a picture of the spot from 621nm and 638nm. The cam does not show the difference very well. Its clearly orange.
View attachment 73153
I am hoping to archive that. I did every „good practice“. The casing should hold the vacuum just fine. I did go to grate efforts to make every seal a metal/metal or metal/Glas seal. Everything should be very tight.Really great work! Looks like all that effort is paying off.
Is the seal for the diode chamber good enough to hold vacuum for a while?