实验教学在学生形象思维能力培养中的应用

人们认识物理世界总是先感知事物的形象,再通过形象思维对形象材料进行概括加工,上升到理性思维,所以物理学的发展离不开形象思维.通过实验创设情境是学生感知物理形象的有效途径.物理教学需要充分发挥物理实验的魅力,以演示实验引入新课,提供形象思维素材,激发学生的学习动机;学生实验贯穿课堂,丰富学生的物理表象库;引导学生对实验中的物理表象展开分析、类比、联想等思维活动,构建物理模型,培养学生的形象思维能力;实践探索性实验延伸到课外,培养学生的创新精神和实践能力.通过实验,将冰冷的物理概念、规律还原出生动的形象,营造一个充满生命活力的物理课堂,发展学生的科学思维,提升学生的核心素养.     

Observation of multi-Raman gain resonances in rubidium vapor

We present an experimental study of multi-Raman gain resonances in a hot rubidium vapor.The experiment is performed based on a high-efficiency four-wave mixing process due to the Raman-driven coherence in a double-A configuration.The Raman gain resonance for ~(85)Rb atoms under a bias magnetic field is shown to be split into five or six peaks,depending on the orientation of the magnetic field.The formed multi-Raman gain resonances have potential applications in measurement of magnetic fields and generation of multi-frequency correlated twin beams.