Electromagnetically induced transparency with orthogonally propagating probe and coupling fields

• Main Authors: Hsieh, Tsung-Hua, 謝宗樺
• Other Authors: Chuu, Chih-Sung
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/369455

碩士 === 國立清華大學 === 物理學系 === 105 === In this thesis, we utilize 2D MOT (Magneto-Optical Trap) for realizing EIT (Electromagnetically Induced Transparency) and generating polarization-entangled photon pairs in the near future. The cold atoms may expand as ellipsoidal cloud due to the zero-line field which we consider as quantum axis in 2D MOT. The photon-atom interaction could be enhanced if the photons propagate in this direction. Besides, there is almost no magnetic field gradient on the quantum axis. As a result, we can neglect quantum decoherence in EIT and FWM (Four Wave Mixing). There are two lasers and a TA (tapered amplifier) in our system. One of them is ECDL (external cavity diode laser), as a master laser; another is a regular diode laser, as a slave. Our goals are MOT stabilization and EIT measurements. We consult the articles1,2 from professor S. E. Harris at Stanford before building the system, and chose Rb 87 right-angle setup in order to get fully entangled biphotons by FWM in the future.