Effects of carrier envelope phase on single shot
- Slides: 35
Effects of carrier envelope phase on single shot XUV super continuum generation 200 Mahendra Man Shakya, Steve Gilbertson, Chris Nakamura, Chengquan Li, Eric Moon, Zuoliang Duan, Janson Tacket, Shambhu Ghimire and Zenghu Chang
Why do we need attosecond pulses? as fs ps 10 -18 s 10 -15 s 10 -12 s Time Circulation Vibration Rotation
What Was Before reported? Single attosecond pulse at cutoff • Laser pulse: 5 fs, 0. 75 mm Single attosecond pulse (250 as) Elaser 85 e. V 135 ev Attosecond pulse train BALTU KA et al. , Nature 421, 611( 2003) t
Our Goal • To study dynamics of electron in atoms and molecules using pump-probe technique with the pulse as short as 25 attosecond (one atomic unit) generated from plateau region of XUV spectrum. • To Study effect of CE phase change on the dynamics of electrons in atoms. • To determine the absolute CE phase from XUV Spectrum
What is the advantage of XUV single shot over f-2 f spectrometer ? • f-2 f set up measures the relative CE phase change. • But it is possible to determine absolute phase from XUV by investigating shot to shot variation of CE phase with polarization gated input.
What is the polarization gating? ? ? e- Right Circular Pulse ee- Td Ellipticity dependent pulse Left Circular Pulse V. T. Platonenko and V. V. Strelkov J. Opt. Soc. Am. B 16, 435 (1999)
Our Method: Generation of pulses with a time-dependent ellipticity Using Quartz plate Optic axis Ellipticity-dependent pulse Quartz Plate l/4 Waveplate
Polarization gate width : Simplified Formula and Example Z. Chang, PRA (2004)
Major problem: Less number of photons Our Effort: • Phase Matched Pressure. • Small Diverging Angle of XUV • Aluminum Filter Shield (Design)
Our Design: Higher Efficiency Gas Cell Parabolic Mirror Aluminum Filter Retractable Mirror Diffraction Grating CCD 1 MCP 2 n. A CCD 2 MCP 1
Phase matching
Phase matched Plot
From phase matching pressure to phase mismatching pressure 20 Torr 30 Torr 55 Torr 80 Torr 60 Torr 125 Torr e. V 35. 65 8 Jan 05_Sun 38. 75 41. 85 45 48 51 54. 25 57. 35
Phase matching
Measurement of half the diverging angle of the XUV beam Focus Gas Cell Parabolic Mirror Retractable Mirror Aluminum Filter Diffraction Grating 8. 1 mrads 21. 7 mrads 1. 35 cm MCP 2 n. A CCD 2 4 cm D=0. 4 cm W 0 MCP 1 W=1. 3 cm
Measurement of half the diverging angle of the XUV beam Focus Diffraction Grating 8. 1 mrads 21. 7 mrads 1. 35 cm 4 cm D=0. 4 cm W 0 W=1. 3 cm
What do we expect to see with polarization gated input? ? -spatial analogy Single electronslit – ion Single Collision Many Multi-slit Electron-ion Collision
CE phase Zero Degree ( Double slits analogy)
CE phase 90 Degree ( Single Slit analogy)
Linear and Long pulse ( 25 fs) Harmonic spectrum (Multi- Slits analogy)
Discrete harmonics with linear and long pulse(25 fs) input
Linear and Short pulse (6 fs) spectrum before polarization gating was applied ( Reduced Slit Number )
Discrete but broad spectral width with linear 6 fs input before gating( reduced slit analogy)
Super continuum with Polarization Gated input at 100 shots (Single Slit Analogy)
Super continuum with polarization gated input at 100 shot (Single slit analogy)
Measurement of The Number of photons per pulse MCP 2 Gas Cell Phosphor Screen Parabolic Mirror Aluminum Filter Retractable Mirror Diffraction Grating CCD 1 hν e- e- MCP 2 n. A CCD 2 n. A hν Phosphor Screen en. A MCP 1
Effect of CE Phase Change on XUV Spectrum
Single shot spectrum with CE phase unlocked 2’ 28” 2’ 20” 1’ 23” 1’ 06” 0’ 50” 0’ 35” 0’ 17” 0’ 0”
Single Shot Super continuum with 4 Dec 05_Sun CE Phase locked
Summary • Dependence of the photon flux of polarization gated high harmonics on the target gas pressure was investigated. • Highest number of photons was estimated to be ~104 , which was enough to run single shot experiment. • We observed effect of CE phase on XUV spectra, which could be applied as a “phase meter”.
Measurement of Number of photons per pulse MCP 2 Phosphor Screen hν e- e- n. A
Required Beam Size to eliminate photon loss Collimating mirror f = 1. 5 m D=? 1. 3 cm =1. 3 cm Focusing mirror f = 250 mm Required D is D=0. 4 cm 1. 3 cm
Measurement of half the diverging angle of the XUV beam Focus Diffraction Grating 8. 1 mrads 21. 7 mrads 1. 35 cm 4 cm D=0. 4 cm W 0 W=1. 3 cm
- Carrier envelope phase
- Waiting line management system
- Http //www.phys.hawaii.edu/ teb/optics/java/slitdiffr/
- Single slit envelope
- Single slit envelope
- Single slit envelope
- Dramaturgiske model
- Ews shot
- Wide shot medium shot close up
- Cut in shot example
- Extreme long shot (els)
- Extreme long shot
- What is an objective point of view
- Ews shot
- Jump shot execution
- Broad phase vs narrow phase
- Tswett pronunciation
- Power formula three phase
- Mobile phase and stationary phase
- Hplc detector types
- Stationary phase in gas chromatography
- In a triangle connected source feeding a y connected load
- Normal phase vs reverse phase chromatography
- Normal phase vs reverse phase chromatography
- Single phase induction motor
- A dual converters has
- Single phase alloy
- Busbar single line diagram
- Single phase half wave rectifier
- Ac voltage controllers
- C2mos master-slave positive edge-triggered register
- Reluctance motor
- Single phase full converter with r load
- Test single phase motor
- Half wave rl load circuit
- Semisolid gel