interferometro on line
interferometro on line
Good morning, I'm Antonio from Barcelona, I have a question, I would appreciate your opinion. I have managed to mount an interferometer with the reference beam and the object beam of the montage, the circles look good but they move a little, I can not send a video because it tells me too large size despite being 3 Mega, it is important that the circles are completely still or may have a small movement, I send you a photo, and if I can send a video, thank you very much
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Re: interferometro on line
video
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Re: interferometro on line
No movement, and black fringes , not gray but black. What laser are u using ?
Re: interferometro on line
Is the 315 rated at a 20mw ? Never saw a 315-20? But theses are normally rock solid? You have it connected with a heat sink, and allowing a few minutes to stabilize?
After finally seeing your video, u may be getting a back reflection
Of the lens you are using, can u send a picture of your interferometer?
After finally seeing your video, u may be getting a back reflection
Of the lens you are using, can u send a picture of your interferometer?
Re: interferometro on line
good morning, I feel the delay, the laser gives 19mw, I really do not know how much it was, it is from 1999, I have reassembled the interferometer, with another laser, to see the stability of the table, and it is a disaster, the stripes They are not still, despite the works that are on the street I think it is the table, surely some of the legs that do not support well, it is an issue that I have to solve before continuing, greetings and thank you very much
Re: interferometro on line
Set up a simple interferometer, w laser beam expanded and to a glass slide or plate, watch the reflection off the plate projected on a white card located just above the laser itself, fringes should be seen and stable, this set up uses only the front and rear surface of the glass plate so stability of the set up is secure... now these guys are going to start crying about how this set up can’t guarantee the coherence , that’s not what we care about now! If you laser is not stable it will show with jumping fringes...
https://www.instagram.com/s/aGlnaGxpZ2h ... 9tnm18jhcx
https://www.instagram.com/s/aGlnaGxpZ2h ... 9tnm18jhcx
Re: interferometro on line
Looks like air motion to me. I would build an enclosure for the interferometer out of cardboard boxes, with only a hole to allow the beam to enter and another hole to observe the fringes (but if possible, put a piece of glass over the observation hole).
Re: interferometro on line
It's mode hopping. The sudden shifting from one state to the other and back again is typical of mode hopping.
Re: interferometro on line
if the ready light is on steady most likely the laser is OK. Phil
PS Lots of information on 315M @ Sam's Laser FAQ
PS Lots of information on 315M @ Sam's Laser FAQ