Lippman photos as filters?
Posted: Mon Nov 02, 2009 11:01 pm
I was looking for narrow notch filters having dichroic filters in mind, but came across holographic filters. To me these seemed to be closely related to Lippman plates so I turned to looking for information about them.
Does anyone have experience with this or any information or suggestions on this subject? Notch filters would correspond to reflection colours, bandpass filters to transmission colours, how does one get one or the other version?
The filter is intended for use with a laser, will the coherence of the laser be an advantage in producing the filter, or could it lead to problem with speckle noise? Swelling could be a severe problem if the filters doesn't match the wavelength used to produce it, but also an opportunity if the shift is such that it can be trimmed back to the desired wavelength by angular adjustments. I guess angles off the perpendicular direction causes a redshift so that the filter should be blueshifted e.g. due to shrinkage after having been produced under moist conditions.
The holographic filters I found information on were quite thick which I assume may be required for obtaining the narrow bandwidth. What bandwidths could be expected with Lippman photos?
Erik Z
Does anyone have experience with this or any information or suggestions on this subject? Notch filters would correspond to reflection colours, bandpass filters to transmission colours, how does one get one or the other version?
The filter is intended for use with a laser, will the coherence of the laser be an advantage in producing the filter, or could it lead to problem with speckle noise? Swelling could be a severe problem if the filters doesn't match the wavelength used to produce it, but also an opportunity if the shift is such that it can be trimmed back to the desired wavelength by angular adjustments. I guess angles off the perpendicular direction causes a redshift so that the filter should be blueshifted e.g. due to shrinkage after having been produced under moist conditions.
The holographic filters I found information on were quite thick which I assume may be required for obtaining the narrow bandwidth. What bandwidths could be expected with Lippman photos?
Erik Z