Two issues - losing an object beam and spots on plate
Posted: Mon Jun 10, 2013 9:52 pm
I am currently experiencing two problems in my rinkydink lab.
First, I am having problems with object beams not showing on hologram (are lit by split off object beam does not appear lit on hologram). While I have intermittently had this problem I have solved it by adding mirrors, but I just not sure which problem to fix in current setup??-there are many likely culprits)
I am trying to do a split beam reflection hologram with overhead reference/object beam on plate and front of object and two object beams on sides of object.
The two side beams illuminate the side of object, the hologram is as if those two beams were not present. This is the result: First thought is a polarization issue... so I bought some polarized sunglasses and...well, it looks ok to me. I first put the glasses in object beam between last mirror and object at normal (as if wearing and looking at beam); then I compared to turning glasses 90 degrees (perpendicular to ground) (normal had only faint shadow while perp blocked most of the light). Then I compared this to the reference beam (also lighting front of object) The result was the essentially the same... Pictures So I wonder does it matter that the reference beam goes up over the object and back down to plate/object while object beams stay paralled (almost) to table?
Does the difference in pathlength make a difference? (Using Compass 315 and pathlength is less than 10 inches different)
Does it make a difference that I turn reference beam upwards by with my diverging lense? (not going through center of lense)
Does it make a difference the relative intensity of object and reference beams?
Issue #2. There is a spot in the center of plate (and smaller spots near bottom) Don't know if I burnt (overexposed) center, or if it is a plate issue.
First, I am having problems with object beams not showing on hologram (are lit by split off object beam does not appear lit on hologram). While I have intermittently had this problem I have solved it by adding mirrors, but I just not sure which problem to fix in current setup??-there are many likely culprits)
I am trying to do a split beam reflection hologram with overhead reference/object beam on plate and front of object and two object beams on sides of object.
The two side beams illuminate the side of object, the hologram is as if those two beams were not present. This is the result: First thought is a polarization issue... so I bought some polarized sunglasses and...well, it looks ok to me. I first put the glasses in object beam between last mirror and object at normal (as if wearing and looking at beam); then I compared to turning glasses 90 degrees (perpendicular to ground) (normal had only faint shadow while perp blocked most of the light). Then I compared this to the reference beam (also lighting front of object) The result was the essentially the same... Pictures So I wonder does it matter that the reference beam goes up over the object and back down to plate/object while object beams stay paralled (almost) to table?
Does the difference in pathlength make a difference? (Using Compass 315 and pathlength is less than 10 inches different)
Does it make a difference that I turn reference beam upwards by with my diverging lense? (not going through center of lense)
Does it make a difference the relative intensity of object and reference beams?
Issue #2. There is a spot in the center of plate (and smaller spots near bottom) Don't know if I burnt (overexposed) center, or if it is a plate issue.