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DEVELOPMENT OF A HIGH ENERGY TI:SAPPHIRE LASER FOR THE EXCITATION OF EXTREME ULTRAVIOLET LASERS
Colorado State University.
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This dissertation describes the design, construction and characterization of a high energy chirped-pulse amplification Titanium-Sapphire laser system for the excitation of Extreme Ultraviolet (EUV) lasers. Compact EUV lasers have made possible nano-scale imaging, dense plasma diagnostics and photo-chemistry and photo-physics studies. They also have the potential to make possible a variety of new studies of surfaces and materials and enable the development of unique metrology and processing tools for industry. The components developed to realize high energy operation of the Titanium-Sapphire laser include the development of a Nd:Glass zig-zag slab pump laser and novel 800 nm multi-layer dielectric diffraction gratings for picosecond compression.

The Titanium-Sapphire laser was used to pump several table-top EUV lasers. Increased average power operation of a 13.9 nm nickel-like silver laser generating 20 ?W was demonstrated. This is the highest average power obtained from a compact EUV laser to date. Injection seeding of the 13.9 nm EUV amplifier produced laser beams with greatly improved beam characteristics which includes a large reduction in beam divergence and a near Gaussian far-field profile. The laser was also used to pump a gain-saturated table-top laser at 10.9 nm in nickel-like tellurium.

Place, publisher, year, edition, pages
ProQuest/UMI , 2010. , 176 p.
National Category
Atom and Molecular Physics and Optics
Research subject
SRA - E-Science (SeRC)
Identifiers
URN: urn:nbn:se:kth:diva-86034OAI: oai:DiVA.org:kth-86034DiVA: diva2:500363
Public defence
2010-12-17, Fort Collins, 10:00 (English)
Supervisors
Funder
Swedish e‐Science Research Center
Note
QC 20120213Available from: 2012-02-14 Created: 2012-02-13 Last updated: 2012-02-14Bibliographically approved
List of papers
1. Gain-saturated 10.9 nm tabletop laser operating at 1 Hz repetition rate
Open this publication in new window or tab >>Gain-saturated 10.9 nm tabletop laser operating at 1 Hz repetition rate
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2010 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 35, no 3, 414-6 p.Article in journal (Refereed) Published
Abstract [en]

We report the demonstration of a gain-saturated 10.9 nm tabletop soft x-ray laser operating at 1 Hz repetition rate. Lasing occurs by collisional electron impact excitation in the 4dS01-->4pP11 transition of nickel-like Te in a line-focus plasma heated by a chirped-pulse-amplification Ti:sapphire laser. With an average power of 1muW and pulse energy up to approximately 2microJ, this laser extends the ability to conduct tabletop laser experiments to a shorter wavelength.

Place, publisher, year, edition, pages
Optical Society of America, 2010
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-85959 (URN)000274196100049 ()20125739 (PubMedID)
Note
QC 20120214Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2017-12-07Bibliographically approved
2. Improved beam characteristics of solid-target son x-ray laser amplifiers by injection seeding with high harmonic pulses
Open this publication in new window or tab >>Improved beam characteristics of solid-target son x-ray laser amplifiers by injection seeding with high harmonic pulses
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2010 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 35, no 14, 2317-2319 p.Article in journal (Refereed) Published
Abstract [en]

Injection seeding of solid-target soft x-ray laser amplifiers with high harmonic pulses is shown to dramatically improve the far-field laser beam profile and reduce the beam divergence. Measurements and two-dimensional simulations for a 13.9 nm nickel-like Ag amplifier show that the amplified beam divergence depends strongly on the seed and can therefore be controlled by selecting the divergence of the seed. The near-field beam size of both the seeded and unseeded lasers is shown to be determined by the size of the gain region and the divergence of the amplified beams.

Place, publisher, year, edition, pages
Optical Society of America, 2010
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-85956 (URN)10.1364/OL.35.002317 (DOI)000279994400001 ()20634815 (PubMedID)
Note
QC 20120217Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2017-12-07Bibliographically approved
3. High-energy 13.9 nm table-top soft-x-ray laser at 2.5 Hz repetition rate excited by a slab-pumped Ti:sapphire laser
Open this publication in new window or tab >>High-energy 13.9 nm table-top soft-x-ray laser at 2.5 Hz repetition rate excited by a slab-pumped Ti:sapphire laser
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2010 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 35, no 10, 1632-1634 p.Article in journal (Refereed) Published
Abstract [en]

We have demonstrated repetitive operation of a table-top lambda=13.9 nm Ni-like Ag soft-x-ray laser that generates laser pulses with 10 microJ energy. The soft-x-ray laser is enabled by a Ti:sapphire laser pumped by high-repetition-rate frequency-doubled high-energy Nd:glass slab amplifiers. Soft-x-ray laser operation at 2.5 Hz repetition rate resulted in 20 microwatt average power.

Place, publisher, year, edition, pages
Optical Society of America, 2010
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-85999 (URN)10.1364/OL.35.001632 (DOI)000277773400047 ()20479832 (PubMedID)
Note
QC 20120306Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2017-12-07Bibliographically approved
4. Large area high efficiency broad bandwidth 800 nm dielectric gratings for high energy laser pulse compression
Open this publication in new window or tab >>Large area high efficiency broad bandwidth 800 nm dielectric gratings for high energy laser pulse compression
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2009 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 17, no 26, 23809-23816 p.Article in journal (Refereed) Published
Abstract [en]

We have demonstrated broad bandwidth large area (229 mm x 114 mm) multilayer dielectric diffraction gratings for the efficient compression of high energy 800 nm laser pulses at high average power. The gratings are etched in the top layers of an aperiodic (Nb0.5Ta0.5)2O5-SiO2 multilayer coating deposited by ion beam sputtering. The mean efficiency of the grating across the area is better than 97% at the center wavelength and remains above 96% at wavelengths between 820 nm and 780 nm. The gratings were used to compress 5.5 J pulses from a Ti:sapphire laser with an efficiency above 80 percent.

Place, publisher, year, edition, pages
Optical Society of America, 2009
National Category
Atom and Molecular Physics and Optics
Research subject
SRA - E-Science (SeRC)
Identifiers
urn:nbn:se:kth:diva-85960 (URN)10.1364/OE.17.023809 (DOI)000273156200049 ()20052091 (PubMedID)
Funder
Swedish e‐Science Research Center
Note
QC 20120306Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2017-12-07Bibliographically approved

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