The Researches On The Characters And The Applications Of The Partially Coherent And Partially Polarized Light

In this dissertation, the properties of paYtially coherent and partiallypolarized light are studied based on the beam coherence --polarization (BCP)matrix approach and propagation law of mutual intensity .The models of beamsstudied in the works are Gaussian Schell-model (GSM) beams and partiallypolarized Gaussian Schell-model (PGSM) beams.The irriadiance distribution at the observation screen of Young's experiment isana1yzed. The YOung's experiment is treated as a two-slit diffractionphenomenon .The dependence of irradiance distribution on the parameter of GSMbeams and slit size (obscure ratio) is studied.The intensity and polarization changes of partia1ly coherent and partiallypolarized light in Young's experiment are studied. Detailed mathematicalfOrmulations and numerical results are given to illustrate the dependence of theintensity distribtltion and degree of polarization of the light at the observationalscreen on the coherence property of the incident light and the orientation ofpolarizers. The more general applicable advantage of the method is pointed out.The polarization properties of GSM beams and PGSM beams passing through apo1arization grating (PG) are studied where the finite size of the PG is considered.The degree of polarization P fOr GSM and PGSM beams in passing through PGschanges upon propagation and is llonunifOrm across the transversal crosssection.lt has been fOund that the finite number of the period and trucation of thePG affect the behavior of the P and the variation of the P for PGSM beams isdependent on the ratio aI / a2.A detailed study of the focal shift of PGSM beams is made. It is found thatapart from the Fresnel number and trucation parameter, the focal shift of PGSMbeams depends on the angle of polarizer and tl1e ratio aI / a2.The phase optimization for use with GSM beam is discussed. The simulatedannealing process is app1ied for the calculation of the diffractive phase (DPE)I I 1element. The optical resconstruction of the DPE is modeled by the convolution of a coherent diffraction pattern and the far-field intensity distribution of GSM beam .The methods of measuring the coherent parameters are discussed which include temporal coherence function, coherence length, the degree of coherence, the global degree of coherence and the average transverse coherence length .The measurements for the degree of polarization and the element of mutual matrix are also presented .