Design and evaluation of phase-deviation sensitive DOEs with possible application in SLM characterization
Typ
Examensarbete för masterexamen
Master Thesis
Master Thesis
Program
Publicerad
2005
Författare
Milewski, Gabriel
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
The spatial light modulator (SLM) is a component which permits dynamic phase and/or amplitude shaping of the cross section of a light beam. Thanks to a high efficiency, its wide range of applications includes e.g. optical beam steering and applications in signal processing. This Master thesis presents a method for designing pixelated diffractive optical elements (DOEs) producing spots whose intensities are optimized to heavily depend on a particular phase modulation level. A theoretical expression for the sensitivity is derived and both simulations as well as experiments show that the achieved sensitivities are several times higher than when using conventional, intensity-maximizing, DOE design methods. Eventually, a non-interferometric way of determining the phase modulation characteristics of an 8-bit SLM unit using these DOEs is suggested. The results in one case show an agreement within 20◦ with measurements made by interferometry. As the method is subjected to a different setting of the SLM unit yielding a higher residual amplitude modulation, interferometry and phase retrieval using DOEs agree to a lesser extent.
Beskrivning
Ämne/nyckelord
Optik , Fotonik , Optics , Photonics