Optical Microscopy And Spectroscopy At Low Temperatures And High Magnetic Fields

This dissertation examines my efforts to develop an optical platform to explore low temperature and high magnetic field materials and device characterization. I have developed a modular scanning confocal microscopy platform using room temperature light generation and analysis which relies on an optical fiber to couple light from ambient conditions into a low temperature and high magnetic field sample environment. I have built two microscopes: one for operation in a dilution refrigerator at temperatures below 100 mK and magnetic fields of