English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Thesis

Automatic mode optimization of an optical resonator via hill climbing

MPS-Authors
/persons/resource/persons232449

Knauer,  Patrick
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)

Master_Thesis_Knauer.pdf
(Any fulltext), 19MB

Supplementary Material (public)
There is no public supplementary material available
Citation

Knauer, P. (2021). Automatic mode optimization of an optical resonator via hill climbing. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.


Cite as: https://hdl.handle.net/21.11116/0000-0008-7D54-E
Abstract
The ultra-high precision spectroscopy of highly charged ions (HCI) paves way for a new
atomic clock standard. To match the larger transition energies in HCI, a near-infrared
(NIR) frequency comb operating at 100 MHz is extended into the extreme ultraviolet
(XUV) regime via high harmonic generation (HHG) inside a femtosecond-enhancement
cavity (fsEC). Large HHG yield is favored by correct coupling of the incident beam to
the desired Gaussian mode of the fsEC. Optimal alignment induces a small focus size,
reduces residue plasma between pulses, and allows for the desired focus intensity of
up to ~1014 W=cm2. Manual mode optimization can be time consuming, prone to error,
and requires far off-resonance operation. This thesis concentrates on the automatic
mode optimization. A hill climb (HC) algorithm is adapted for close to resonance operation
and demonstrates intensity gain of up to 300% in less than 100 iterations, while
correcting for resonance shifts and successfully depleting higher order transverse electromagnetic
modes (TEM) in favor of the desired Gaussian mode.