刘旭老师2016第一章课件-浙江大学光电系.ppt

* Optoelectronics Introduction * 课程思考 光电子学包含的范围？ 激光器对人类发展的贡献？ 如何能够做到将激光的波长覆盖全光谱？ 光电探测器的主要实现光－电的转换，如何实现 光－光的转换与控制 除光电转换外，人类对光的控制与利用还有其他的形式吗？效果如何？ Free-electron laser FELs use a relativistic electron beam as the lasing medium which moves freely through a magnetic structure, hence the term free electron. The free-electron laser has the widest frequency range of any laser type, and can be widely tunable, currently ranging in wavelength from microwaves, through terahertz radiation and infrared, to the visible spectrum, to ultraviolet, to X-rays * Optoelectronics Introduction * Laser classification Gas laser Solid state laser Semiconductor laser Dye laser Free electron laser Fiber laser Photonic crystal laser * Optoelectronics Introduction * * Optoelectronics Introduction * Excemer laser （ultraviolet） * Optoelectronics Introduction * Laser fusion (new energy) * Optoelectronics Introduction * Schematic of conventional inertial confinement fusion; (bottom row) Schematic of the fast ignitor concept National Ignition Facility * Optoelectronics Introduction * Laser machine Lasing Materials Applications CO2 Boring Cutting/Scribing Engraving Nd High-energy pulses Low repetition speed (1?kHz) Boring Nd-YAG Very high energy pulses Boring Engraving Trimming Fiber laser Convenience in the application * Optoelectronics Introduction * * Optoelectronics Introduction * Light sources Incandescent lamp Gas discharge lamp Semiconductor light source * Optoelectronics Introduction * * Optoelectronics Introduction * LED（light emitting diode） 2014 Nobel Price (Physics) * Optoelectronics Introduction * * Optoelectronics Introduction * Photonic crystal to increase the efficiency Quantum efficiency Out coupling efficiency * Optoelectronics Introduction * Electro-optical effect（Display） Electro-optical modulation technique EO crystal Liquid crystal KDP crystal * Optoelectronics Introduction * 液晶（Liquid Crystal） * Optoelectronics Introduction * Optical communication(light sourc