激光原理與激光器ppt課件(完整版)
【正文】 分布反饋 Lasers in munication systems 4 PIN receivers 160 km standard fibre booster amplifier 4 WDM EADFB lasers preamplifier attenuator and power meter optical spectrum analyser channel separation: 100 GHz ( nm) D E M U X laser as source laser as amplifier PINdiode PINdiode Input 1550 Monitor tap Isolator 980/1550 coupler Er fibre Isolator Monitor tap Output 980 nm pump laser 光功率放大器 DeMultiplexer 分路器 Wavelength Division Multiplexer 波分復(fù)用系統(tǒng) 前置放大器 Erbiumdoped Optical Fiber Amplifer 摻鉺光纖放大器 PositiveInstincive Negative 光電轉(zhuǎn)換 隔離器 隔離器 耦合器 Optical Electronics, Fall 2022 Energy Lever of Er3+ 980 nm 1550 nm 1550 nm 1550 nm 1550 nm Optical Electronics, Fall 2022 Chapter 7 Some Specific Laser Systems Solid laser Gas laser Excimer laser （激基分子激光器） Semiconductor laser Ruby Laser Nd3+:YAG Laser NeodymiumGlass Laser HeNe Laser CO2 Laser Ion laser Ar+ Laser （摻鉺光纖放大激光器） Quantum Well Laser DFB Laser VCSES Laser Gain Material (EDFA) 量子阱 分布反饋 垂直腔表面發(fā)射半導(dǎo)體 Fiber Laser Optical Electronics, Fall 2022 Active medium: Impurity ions in a transparent dielectric host ? ions: rareearth ( 3+) or transitionmetal ions ( 3+) [concentrations: ~10%] ? Hosts: crystals (oxides, gars 石榴石 or fluorides 氟化物 ) or glasses ? Pumping: optical pumping Ⅰ Solid laser Optical Electronics, Fall 2022 (1) Ruby Laser ? Ions: rareearth (Cr 3+) [concentrations: %, ] ? Hosts: Al2O3 (synthetic sapphire, 人造藍(lán)寶石 ) ? First laser (1960)。 3level laser。 Nd3+:Glass Laser Optical Electronics, Fall 2022 ? Nd: YAG Laser: ① YAG most mon host material ② typical values: ? pulse rate: 10100 Hz ? CW power: 10100W ? pulse energy: 50mJ10J ? Nd: glass Laser: ① Possible to fabricate large rods → high pulse energy ② glass is a poor heat conductor → low pulse rate ? Harmonic Generation: ( fundamental λ: ) 2. harmonic: 532 nm 3. harmonic: + 532 nm → 355 nm (UV) 4. harmonic: 266 nm (UV) Nonlinear optical crystals (KTP, BBO, …) (2) Nd3+:YAG amp。 Nd3+:Glass Laser Optical Electronics, Fall 2022 1. 如何選擇激光介質(zhì)？ ？ 泵浦結(jié)構(gòu)主要包括端泵、側(cè)泵、面泵等等 ？ 是水冷還是風(fēng)冷，是空氣自然冷卻還是用 TEC進(jìn)行冷卻或者用熱管進(jìn)行冷卻 4. 腔結(jié)構(gòu)如何選擇？ 腔大體上分穩(wěn)定腔和非穩(wěn)
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