Transcription of 固体レーザー設計の 基礎と実際 - Osaka U
1 20 , 2013 3 5 T. H. Maiman in 19602 108 shots 108shots: 10 Hz 116 3 4 5 10 10 100W LD LD 12 CW480W LD 6 ~10%>90%7 - 50 70% ~10% Nd:YAG >90% 100 1000 h10,000 20,000 h 1000 V2 50 V 8 9 Czochralski Nd:YAG 10.
2 Glass 1 YAG 10 1 YAG 5 1 J. Lu et al, Laser Physics 11, 1053 (2011) Nd: Nd3+:Y3Al5O12(Nd:YAG) Nd3+:LiYF4(Nd:YLF) Nd3+:YVO4 Nd3+:Glass Yb: Yb3+:Y3Al5O12(Yb:YAG) Yb3+:Sr5(PO4)3F Yb3+:Glass Er: Er3+:Y3Al5O12(Er:YAG) Er3+:Glass Cr: Cr3+:Al2O3(Ruby) Cr3+:BeAl2O4(Alexandrite) Cr3+:LiSrAlF6(Cr:LiSAF) Tm: Tm3+:Y3Al5O12(Tm:YAG) Tm3+:Glass Ti: Ti3+ Al2O3(Ti:Sapphire)14Nd:YAGNd:YAG Nd:YAG 1064 nm15Ti:Sapphire16Yb:silica fiber Nd:YAGTi:sapphireYb:silica fiber 1064 nm800 nm1030 nm (FWHM) nm180 nm~100 nm f230 s~1 ms J/cm2~40 J/cm2 Is=Js/ f2 kW/cm2280 kW/cm2~40 kW/cm2 CW CW 10fs 20fs l: , g0: [cm 1]Jsto: [J/cm2], Js=h L/ em: [J/cm2] em: , N2,N1: , : [W/cm2] : [s] / / : : : , / CW tp Optipedia ( )Nd:YAG CW LD End pumpNd.
3 YAG 1064 nm (FWHM) nm f230 s J/cm2 Is=Js/ f2 kW/cm2 CW 2 kW/cm2 230 s 808/1064 1 J/cm2 exp / 2 132 GHz psTi:sapphire CW End pumpTi:sapphire 800 nm (FWHM)180 nm s J/cm2 Is=Js/ f280 kW/cm2 CW <10fs 2 kW/cm2 s 532/800 1 J/cm2 exp / 84 THz fs parameters TEM00 Amnon Yariv 4 D. E. Spence et al, Opt. Lett. 16, 42 (1991) Ring SeriesD. Bauer et al, Opt. Exp. 20, 9698 (2012) m 41 JS.
4 De Silvestri, et al, Opt. Lett. 16, 642 (1991) / 1 exp2 1 2 ln exp 2 1 2 ln 1 (Output coupler) / 1 exp ln 2 1 2 exp 2 1 2 2 ln 1 1 1 1 1 2 ln 1 1 1 2 ln 1 1 2 ln / ln 2 L 0 R1 1 1 2 ln 10100200300400500R1Is= 2 kW/cm22g0l= 1L = g0l L R1 g0l L R1 1 2 1 / R1 W.
5 Koechner , Solid State Laser Engineering (Springer Series in Optical Sciences) Frantz Nodvik L. M. Frantz, J. S. Nodvik, J. Appl. Phys. 34, 2346 1963 . ln exp 1 1 exp T: Jsto: [J/cm2]Js: [J/cm2] (Jout Jin)/ 2 ln exp 1 1 exp , 0204060012 Number of round tripPulse fluence [J/cm2]G0 = = Js= J/cm2 catastrophic optical damage (COD) CW 1~1000 MW/cm2 1~50 J/cm2 (@10 ns) , , ASE CW , YAG, sapphire 100MW/cm2 1kW 100 m 20 40 m 10 kW 1GW/cm2 CW 10 ps~10 ns , B.
6 C. Stuartet al, Phys. Rev. Lett. 74, 2248 (1995). = 1053 nm 1 10 GW/cm2 1021cm-3@ 1 m 1 50 J/cm2(@ 10 ns)( ) 8mm N :YAG 14W ( ) / 2 W. Koechner, Appl. Opt. 9, 2548 (1970).M. E. Innocenziet al, Appl. Phys. Lett. 56, 1831 (1990).dn/dT: [K 1] : [W/m K]A: YAG dn/dT= 8 10 6[K 1] =13 [W/m K] 200 m 14W f = 7 mm (Kerr lens) (SPM) 3 3 3 n2 P= 0( (1)E+ (2)E2+ (3)E3+ ) esu Amnon Yariv 17 B integral B 2 B B n2 3 10 16cm2/W 800nm B 2 / 800 107cm 3 10 16cm2/W 1 1011W/cm 1 cm 1011W/cm2 1cm CW Ti:sapphire (1/4) Nd.
7 YVO4 5 W, TEM00 (M2= ), 1mm f=100mm 10 mm 3 cm 1@532 nm (95% )FOM=100 T= @800nm : : .. 34 m : :2 . 275kW/cm2 Is = 280 kW/cm2 CW Ti:sapphire (2/4) 28 m CW Ti:sapphire (3/4) / 2 10 2 40 28 m/2 5 1 532800 220 m 1 mm [mm] [ m] 28 m 24 m CW Ti:sapphire (4/4) / 275 kW/cm2 s 532/800 1 G0 L 1 1 2 / 1 1 1 2 ln 1 28 m/2 1 ~1 W 20% CW Nd:YAG (1/4) , 808nm, 50 W 100 m, Nd.
8 YAG 10 mm , 3 cm 1@808 nm (95% ) cm 1 ( in 10mm) / surface : 200 m : . 40 kW/cm2 Nd:YAG Is = 2 kW/cm2 LD / . 50 1 31 m 1 f 32 mm CW Nd:YAG (2/4) CW Nd:YAG (3/4) CW Nd:YAG (4/4) / 40 kW/cm2 230 s 808/1064 1 G0 600,000 L 1 2 / 1 1 1 2 ln 1 200 m 1 ~32 W 64% 1 Ti:sapphire 20 mm , 2cm 1@532 nm (98% ) / surface 10 J/cm2 @ 10 ns, 532 nm 3 J/cm2@1 ns, 800 nm Q Nd.
9 YAG 532 nm 10 ns 1J 10 Hz 10 ns << s g0l >3 G0>20 ~8% 1 Ti:sapphire 2 <5 J/cm2 2 < J/cm2 50% <3 J/cm2 g0l >3 G0>20 ~8% / . G0= 9 1 J / (3 J/cm2)= , mm labs= 1/ = 5 mm 1 Ti:sapphire 50% mJ G = ~1000 stok/ 50%= ~75% (Jout-Jin)/Jsto (mJ)
