激光原理與激光器ppt課件-在線瀏覽
2025-06-22 02:06本頁面
【正文】 eparation: 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, 人造藍寶石 ) ? First laser (1960)。 pulse operation ? Optical Pumping: flashlamps (~ 5 104 s) ( ③ two absorption bands) See Figure 73 12( ) ( N N ) ( )? ? ? ???吸收系數 躍遷截面 See Figure 74, , R2 , R1 three level laser ① ② ③ 2AE3+Cr4F2 4F1 R1 See Figure 75, f ( T ),??? 正 比Optical Electronics, Fall 2022 （螺旋狀的） Typical setup of a pulsed ruby laser (1) Ruby Laser + Circuit + Cooling system External Mirror （螺旋狀的） External Mirror (partially transmitting) Output Beam （聚光腔） ? Structure Optical Electronics, Fall 2022 (1) Ruby Laser ? Parameters: t flash t 2 N0 : N1 +N2 N2 :the number of atoms pumped into level 2 f2 0l a s hs ( )N ( ) ( ( 7 . 2 2 ))dth? ? ? ? ? ??????? Applications: ① Holography （全息） ② Medical applications ? Large holograms ? Holographic interferometry ③ Plasma diagnostics (等離子體診斷學） ? Comments: ① requires strong pumping ② long upperstate lifetime → double pulse ③ cooling p
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