激光原理與激光器ppt課件-資料下載頁
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【正文】 11E ( , , ) h ( ) h ( )221h ( ) ( 7 .6 1 )2? ? ? ? ? ? ???? ? ? ?? ? ?Total energy of the molecular: Optical Electronics, Fall 2022 Figure 717, Energy level 001 100 020 010 (2) CO2 Laser He: buffer gas Optical Electronics, Fall 2022 ? 4 types of Construction: ① Closed discharge tube ② wave guide (2) CO2 Laser Optical Electronics, Fall 2022 ③ slow axial flow fast axial flow ④ transverse flow + transverse discharge transverse excitation – atmosphere pressure (2) CO2 Laser More power with gas circulation （循環(huán)） Optical Electronics, Fall 2022 (2) CO2 Laser ? Applications: ① Material processing ? Cutting and welding （焊接） of metals and nonmetals ? Heat treatment of metals ? Scribing （雕合） ② Medicine ? no bleeding （止血） ? surgery ( water absorbs well in 10um) ③ Research ? Spectroscopy (LIDAR) ? Laser chemistry ? Pumping of FIR laser ④ Military Optical Electronics, Fall 2022 (3) Ion laser: Ar+ Laser Visible( 350nm ~ 520nm ), the most important laser ? Gas: Ar+ (18) or Kr+ (36) ? Pumping: electric discharge (電子放電） ? 4level laser。 CW operation Optical Electronics, Fall 2022 (3) Ar+ Laser Optical Electronics, Fall 2022 (3) Ar+ Laser ? Advantages: ? high power in blue ? materials typically more sensitive for blue than for red ? good quality output beam and long coherence length ? Applications: ? Laser printers ? CDROM mastering ? Holography ? Spectroscopy ? Pumping of other lasers ? Surgery (eye) ? photochemistry ? Light shows Optical Electronics, Fall 2022 (4) Excimer laser excimer (激基分子） = excited dimer （二聚物） UV ( 200nm ~ 400nm ) ? ? ? 激基狀態(tài) : (RH)* = (AX)* ? Pumping: energetic ebeams (高能電子束） ? short pulse operation （鹵化物） ***R H ( R H ) 4 e Ve + R e RR H ( R H ) + 6 e V????? ? ?????Optical Electronics, Fall 2022 Structure: Parameters: (4) Excimer laser Optical Electronics, Fall 2022 (4) Excimer laser ? Applications ? micromachining by laser ablation (polymers, biological materials, etc.) ? eal sculpting (PRK, LASIK) ? photolithography （影印平版術(shù)） ?dye laser pumping （消融，切除） (a) Pulsed Nd3+:YAG (b) Pulsed CO2 (c) Excimer laser Optical Electronics, Fall 2022 Ⅳ EDFA
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