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3.光学与以上讲的气体和凝聚态物质不同,光和红外线属于电磁场。十九世纪光学主要研究光的传播特性。到了二十世纪发展到光发射以及光和介质作用的微观机制的研究。它的频段并扩展到与微波相衔接。二次大战后逐步发展了光学遥感和红外探测等应用技术,使光学的应用有了发展。六十年代做成了激光器。激光器是利用光受激发射原理做成的光放大器。它产生的光单色性好,相干长度长,而且亮度高。激光的发展不仅使光学面貌发生了深刻的变化,还促进了原子和分子物理学的复兴。
3. Optical Unlike the gas and condensed matter mentioned above, light and infrared belong to the electromagnetic field. Nineteenth-century optics mainly studied the propagation characteristics of light. In the twentieth century to the development of light emission and light and the role of the micro-mechanism of the media research. It's frequency band and extended to microwave convergence. After World War II and gradually developed optical remote sensing and infrared detection and other application technologies, the optical applications have been developed. Sixties made a laser. Laser is the use of light stimulated emission principle made of optical amplifier. It produces good monochromatic light, long coherence length, and high brightness. The development of laser not only profoundly changes the optical appearance, but also promotes the revival of atomic and molecular physics.