Three different techniques for extending the depth of field of a low-power (4x) microscope objective system are examined experimentally: wavefront coding with a cubic phase mask, amplitude modulation with a large central obscuration, and added spherical aberration. Their relative merits are discussed and demonstrated with sample images.
A spectropolarimeter utilizing an Oriel MIR8000 Fourier Transform Spectrometer in the MWIR is demonstrated. The
use of the channeled spectral technique, originally developed by K. Oka, is created with the use of two AR coated
Yttrium Vanadate (YVO<sub>4</sub>) crystal retarders with a 2:1 thickness ratio. A basic mathematical model for the system is
presented, showing that the Stokes parameters are directly present in the interferogram. Theoretical results are then
compared with real data from the system, an improved model is provided to simulate the effects of absorption within the
crystal, and error between reconstructions with phase-corrected and raw interferograms is analyzed.