Research On Color Erasure Intensity Interferometry

Since Hanbury Brown and Twiss(HBT)first proposed an ingenious method to exploit second-order interference in 1956,there has been a revolution in high-resolution imaging.However,there are many circumstances where sources emit photons of different wavelengths,whose distinguishability ruins the interference.Color erasure detector provides a solution to this problem.In this thesis,we developed color erasure detector both in theory and in experiment.Based on Periodically poled lithium niobate(PPLN)waveguides,we built color erasure detector and intensity interferometer.We implemented research on the interference between sources of different wavelengths and experimentally demonstrated improved spatial resolution based on color erasure intensity interferometry.The relevant works are decribed as following:1.We built color erasure detector with one PPLN waveguide for the first time in laboratory.The color information between 1550 nm photons and 863 nm photons could be erased.Using color erasure detector,we achieved the interference between 1550 nm and 863 nm coherent cource,and also observed robust interference using both thermal light sources.Moreover,we observed intensity interferometry in space.2.With the one waveguide method,when the frequency difference between the incoming photons is less than 67THz,the wavelength of pump would be larger than 4500nm,which surpasses the passband of a PPLN waveguide.By developing a ’twocrystal’ method for color erasure,we broadened the scope of chromatic interferometry to include optical photons whose frequency difference less than 67THz.We achieved the second order interference between 1063.6 nm and 1064.4nm photons in experiment.3.We experimentally demonstrated how color erasure detectors could achieve improved spatial resolution in an imaging task,well beyond the diffraction limit.Utilizing two 10.9 mm-aperture telescopes and a 0.8 m baseline,we identified a 1063.6 nm source and a 1064.4 nm source separated by 4.2 mm at a distance of 1.43 km,which surpassed the diffraction limit of a single telescope by about 40 times.We also implemented research on the first order interferometry of sources of different colors,and successfully observed the phase in the space.4.We conducted research on time-frequency technology and built a set of ultrastable light with a linewidth of about 2Hz.After conducting laboratory frequency transmission experiments,we designed an integrated optical fiber frequency transmission system and achieved a outloop stability of 10-18 at a distance of 186km.Our work showed how to implement intensity interference based on color erasing detection.We expect that it plays a potential role not only in the field of spatial superresolution based on intensity interference,but also in the fields of quantum optics and quantum information.