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A Numerical Study of the Wavelength Dependence in an Off-Plane XUV Monochromator: Bachelor of Science Degree Thesis
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In this thesis the work is based around the HELIOS (High Energy Laser Induced

Overtone Source) laboratory, a facility at the Division of Molecular and Condensed

Matter Physics at the Department of Physics and Astronomy, Uppsala University, Sweden.

HELIOS generates XUV (extreme ultraviolet) photon pulses with energies between

15-70 eV and pulse lengths shorter than 50 fs. It is believed that the grating in the

monochromator of the lab introduces a chirp, meaning that the different constituent

energies of the pulse will be ordered in an non homogeneous way. Since the lab is striving

to create as short pulses with as high temporal resolution as possible, learning more

about any effects that might change the pulse is of great interest. If the source of the

chirp effect is known then possible countermeasures can start being discussed. To investigate

the pulse a numerical ray trace is performed for a XUV pulse passing through the

monochromator using the BeamFour© software. A pulse consisting of 49500 rays with

mean energy 40 eV and FWHM 0.5 eV was traced, but no clear dependence between

wavelength and the pulse length could be observed. This seems to indicate that there

either is no chirp present in the monochromator or that it is of such a small order that

higher certainty (more rays) will be required to observe it.

Abstract [sv]

I detta examensarbete baseras arbetet på HELIOS-laboratoriet (High Energy Laser Induced

Overtone Source), en anläggning vid avdelningen för molekyl- och kondenserade

materiens fysik, institutionen för fysik och astronomi, Uppsala universitet, Sverige. Vid

HELIOS genereras XUV (extremt ultravioletta) fotonpulser med energier mellan 15-

70 eV och pulslängder under 50 fs. Vid avdelningen tror man att gittret i laboratoriets

monokromator introducerar en så kallad chirp, vilket innebär att de olika energierna

som bygger upp pulsen blir uppdelade i en icke homogen ordning. Eftersom labbet

strävar efter att skapa så korta oc kompakta pulser som möjligt är det av stort intresse

för avdelningen att lära sig mer om effekter som påverkar pulsens form. Om

utsträckningen av sådana effekter är välkänd så kan man börja diskutera åtgärder för

att motverka dessa, eller åtminstone vara medveten om dem. För att undersöka hur

pulsen beter sig så har en numerisk strålspårning utförts för en XUV-puls med hjälp

av programvaran BeamFour© . En puls innehållande 49500 strålar med genomsnittlig

energi 40 eV och halvvärdesbredd (FWHM) 0.5 eV spårades, men inget tydligt beroende

mellan våglängd och pulslängd kunde observeras. Detta tyder på att det antingen inte

uppstår någon chirp i monokromatorn, alternativt att den är av sådan liten storlek att

högre mätsäkerhet (fler strålar) kommer behövas för att observera den.

Place, publisher, year, edition, pages
2015. , 26 p.
Series
FYSAST, FYSKAND1044
Keyword [en]
off-plane, off-axis, xuv., monochromator, femtosecond, pulse, wavelength dependence, chirp, grating, blazed, specular, reflection, diffraction, grazing, high harmonic generation, hhg, helios, ray tracing, ray trace, numerical, pulse length, temporal resolution, beamfour
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:uu:diva-257151OAI: oai:DiVA.org:uu-257151DiVA: diva2:833847
Educational program
Bachelor Programme in Physics
Supervisors
Examiners
Available from: 2015-06-30 Created: 2015-06-30 Last updated: 2015-06-30Bibliographically approved

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