Femtosecond laser pre-pulse technology for LPP EUV source
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1 Femtosecond laser pre-pulse technology for LPP EUV source A. Vinokhodov*, V. Krivtsun*, **, M.Krivokorytov*, Yu. Sidelnikov*, **, S.Chekalin**, V.Kompanets**, A. Melnikov**, K. Koshelev*, ** * EUV Labs, Troitsk, Moscow, Russia **ISAN, Troitsk, Moscow, Russia Slide 1
2 FS Laser Laser Generator Tsunami Spectra Physics Regenerative amplifier Spitfire Spectra Physics Autocorrelator Pulse Scout Spectra Physics Laser parameters Wavelength 800 nm Pulse energy 2.3 mj Duration(FWHM) 50 fs 80 ps Gaussian beam energy profile Minimum focal spot size at F=200 mm(fwhm) 50 um Average power density in focal spot 3*10 15 W/cm 2 PRR 1 khz Droplet Sn-In eutectic alloy (48%/52% atomic composition) Operating temperature 140 C Size 40, 50, 60, 70 um Velocity 2-4 m/s Interaction zone 1 cm from nozzle. Slide 2
3 Why we used In-Sn alloy Physical quantity In Sn, % Atomic number Atomic weight Density (near r.t.), g*cm Liquid density (at melting point), g*cm Molar heat capacity, J*mol -1 *K Atomic radius, pm Surface tension, din*cm Melting point, O C I II III IV V Ionization potentials VI VII VIII IX X Slide 3 Physical quantity Sn (300 C) In Sn alloy (200 C) Surface tension,din/cm Kinematic viscosity, cst Main physical properties of In, Sn and In-Sn alloy are very similar Replacement of Sn on In-Sn eutectic alloy allows to use much more reliable experiments because of lower work temperature. The alloy may be used as working substance in LPP EUV source. Conversion efficiency of LPP EUV source by using the alloy is about 70% from one by using pure Sn as working substances. In-Sn eutectic alloy can be used in modeling experiments for Sn droplet in pre-pulse technology of LPP EUV sources.
4 Synchronization diagram and DG+FS laser setup Multistage hit technology of laser beam into droplet Shadow stroboscopic image 1- FS laser, 2- DG, 3- vacuum chamber, 4- driving generator, 5- frequency divider, 6-delay generator, 7- DG controller, 8- diode laser (IL30C, 850nm, 30ns), 9- long distance microscope (K2 DistaMax), 10-CCD camera (Manta MG-145B), 11- Faraday cup, 12- ion spectrograph, 13- pump, 14- tungsten filament, 15- beam formation optics (diffuser+lens), 16- band pass filter (850nm). Slide ns
5 Droplet generator operation DoD type nozzle based on annular piezoelectric actuator (MJ-SF-002 MicroFab Tech) Shadow stroboscopic images 60um droplet 8 Hz, 10mm from nozzle 100 um Pulse train at 5kHz run, v 2.5 m/s Drive voltage pulse σ z 15 um σ r <5 um 300 um We have more than 6 controlled parameters of driving pulse! Observed area 4.7 x 3.5 mm, Spatial resolution 3.7 um Exposure time (laser pulse duration) 30 ns Slide 5
6 Sets of used experimental parameters Variable parameters : Droplets size Laser pulse durations Laser pulse energy Focal spot sizes Constant parameter: PRR of DG PRR of FS laser 8 Hz 1 khz 40 um, E las =2.3 mj fs, 50 um fs, 50 um fs, 50 um fs, 50 um ps, 50 um 50 um, E las =2.3 mj 50 fs, 50 um 400fs, 50 um Slide 6 60 um, E las =2.3 mj fs, 50 and 100 um fs, 50 and 100 um fs, 50 and 100 um fs, 50 and 100 um fs, 50 and 100 um ps, 50 and 100 um 7. 3 ps, 50 and 100 um ps, 50 and 100 um ps, 50 um 60 um, E las =1.3 mj 50 fs, 50 and 100 um 60 um, E las =0.4 mj 50 fs, 50 um 70 um, E las =2.3 mj 50 fs, 50 um Delay between FS and diagnostic lasers us >160 images in each delay
7 Droplet deformation at τ las = 50 fs E las =2.3mJ 60 um t delay between FS laser and diagnostic diode laser Focal spot 50 um, I=3*10 15 W/cm 2 t = 2.0 us t = 3.0 us t = 4.0 us The images at different delays belong to different droplets, but deformed images are reproduced very well. Focal spot 100 um, I=7.5*10 14 W/cm 2 Main difference from ns PP: deformed droplets have shape of hollow thin 3D shells!! Slide 7 t = 3.0 us t = 4.0 us t = 7.0 us
8 E las =2.3mJ 60 um Droplet deformation at τ las = 100 fs Focal spot 50 um, I=1.5*10 15 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Focal spot 100 um, I=3.8*10 14 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Slide 8
9 E las =2.3mJ 60 um Droplet deformation at τ las = 200 fs Focal spot 50 um, I=7.5*10 14 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Focal spot 100 um, I=1.8*10 14 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Slide 9
10 Droplet deformation at τ las = 450 fs E las =2.3mJ 60 um Focal spot 50 um, I=3.8*10 14 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Focal spot 100 um, I= W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Slide 10
11 E las =2.3mJ 60 um Droplet deformation at τ las = 800 fs Focal spot 50 um, I=1.8*10 14 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Focal spot 100 um, I= 0.45*10 14 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Slide 11
12 Droplet deformation at τ las = 1.5 ps E las =2.3mJ 60 um Focal spot 50 um, I=10 14 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Focal spot 100 um, I= 2.7*10 13 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Slide 12
13 E las =2.3mJ 60 um Droplet deformation at τ las = 3 ps Focal spot 50 um, I=5*10 13 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Focal spot 100 um, I= 1.3*10 13 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Slide 13
14 E las =2.3mJ 60 um Droplet deformation at τ las = 5.3 ps Focal spot 50 um, I=2.8*10 13 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Focal spot 100 um, I= 7.4*10 12 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us Slide 14
15 E las =2.3mJ 60 um Droplet deformation at τ las 80 ps Focal spot 50 um, I = 1.9*10 12 W/cm 2 t = 1.0 us t = 2.0 us t = 3.0 us t = 4.0 us t = 5.0 us t = 6.0 us t = 7.0 us Slide 15
16 V -Z V R Shell expansion velocity vs pulse duration Shadowgrams at different laser duration E las =2.3mJ, 60 um, t = 1.0 us V Z V Z 300 m/s V -Z 80 m/s V R 120 m/s 100 images averaging. V Z 100 fs 200 fs 400 fs V R V -Z 800 fs 1.5 ps 3 ps There is weak dependence of droplet expansion velocity on pulse duration at more than 1 ps. Dependence velocity on laser power density for ns lasers V Z I 2/3 is not working in this case! Slide 16
17 Variety of deformed shapes (some examples) 60 um Changing experimental parameters (size of droplet and focal spot, laser pulse duration, laser energy, delay) we can choose the optimal target shape for LPP EUV source from point of view max CE, min debris and high energy ions. All shapes have been stable from pulse to pulse Laser Mist E las =0.4 mj SS=50 um τ las =50 fs τ=10us conditional types Dome E las =2.3 mj SpotSize=50 um τ las =100 fs τ=3 us Nut E las =2.3 mj SS=50 um τ las =200 fs τ=1us Medusa E las =2.3 mj SS=100 um τ las =200 fs τ=4 us Blot E las =1.3 mj SS=100 um τ las =50 fs τ=10 us Heart E las =0.4 mj SS=50 um τ las =50 fs τ=4 us Slide 17
18 Ion flux measurements Slide 18
19 Total ion flux Oscilligrams of total ion current Droplet 70 um 40 um Focal spot 50 um FC-1 with amplifier (against laser beam) FC-2 without amplifier (along laser beam) Total ion charge vs pulse duration Taking into account FC-1 amplifier gain FC-1,2 solid angles Slide 19 Total charge of ions flying against laser beam for 70 um droplets is much more than one for 40 um droplet. Total charge of ions flying against laser beam is much more than ones flying in along laser beam. There is min total charge at 800 fs pulse duration which correlates with max of shell expansion velocities.
20 Distribution of total ion charge on ion energy FC-1 against laser beam Droplet 70 um FC-2 along laser beam High energy ions charge vs pulse duration High-energy ions fly only in the opposite to the propagation of the laser beam. Maximum number of the high-energy ions observed at 50 fs pulse. There is minimum of the high-energy ions at 800 fs pulse. Slide 20
21 Ion spectrum measurements Electrostatic ion energy analyzer based on a cylindrical capacitor +U a /2 Axis path for specific energy ions E ion = 1.25*Z*U, U deflection voltage, energy scaling factor Ion source -U a /2 Transimpedance amplifiers Grid 5mm aperture Faraday cup Detector Faraday cup Input aperture 1 mm Azimuth angle between laser beam and IS 30 Angle in vertical plane to the laser beam 17 Distance to the droplet 500 mm Slide 21
22 Oscillograms of ion beam current Droplet 50 um, focal spot size 50 um 64 measurements averaging. 32 measurements averaging. Ion multiplicity Z=1; 2; 3; 4; 5 Ion multiplicity Z=1; 2 τ laser = 50 fs, P=1.5*10 15 W/cm 2 U = 800 V τ laser = 400 fs, P=3.8*10 14 W/cm 2 U = 200 V Slide 22 Ion multiplicity for 50 fs pulse much more than for 400 fs pulse
23 Sample A (along laser beam ) Number of pulses Electron microscope photos 60 um, 50 fs Mag 9KX Debris deposition 60 um, 50 fs Mag 1KX Minimal size of observed debris 90 nm 55 um, 5.3 ps Mag 1KX 1um 2um 2um Sample B (against laser beam ) 60 um, 50 fs 60 um, 50 fs Mag 9KX 60 um, 50 fs Mag 1KX 55 um, 5.3 ps Mag 1KX 1um 2um 2um Slide 23
24 Debris distribution For particles >250nm, step of particle sizes 100nm 1.Distribution for all modes and both s are close. 2. Mass of particles flying along laser beam are much more than ones flying against laser beam At isotropic scattering of debris masses would be: For 60um 6.6*10-8 g/sr For 55 um 5*10-8 g/sr For 40 um 1.9*10-8 g/sr Number and mass of debris from single droplet in 1 sr 60 um, 50 fs 40 um, 5.3 ps 55 um, 5.3 p s Sample A (4.9*10-8 g/sr) (2.6*10-8 g/sr) (1.5*10-8 g/sr) Sample B (10-8 g/sr) (0.2*10-8 g/sr) (0.37*10-8 g/sr) Slide 24 Where is difference? Vapor?
25 Summary In-Sn droplet deformation and fragmentation dynamic at the action of femto- and picosecond laser in wide band pulse duration from 50 fs up to 80 ps at power density up to P=3*10 15 W/cm 2 were studied by ultrafast shadowgraph method. Changing experimental parameters it is possible choose the optimal shape of target for LPP EUV source. Total ion charge and ion spectrum measurements at action of laser with femto- and picosecond pulse duration on In-Sn droplets were carried out. It is established that high-energy ions up to 8 kev are present only in the opposite to the laser beam. Debris distributions at interaction of femto- and picosecond laser with In- Sn droplets. It is established that particles flying along laser beam are much more than ones flying against laser beam. Slide 25
26 Acknowledgements We thank ASML company for technical support our experiments. Thank You for Your Attention Slide 26
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