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Nonlinear Optical Frequency Conversion for Lasers in Space

Potreck, Arne (2014) Nonlinear Optical Frequency Conversion for Lasers in Space. Diploma, Eberhard-Karls Universität Tübingen.

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A frequency conversion unit, based on two BiBO crystals in a crystal holder suitable for a future space mission, is presented within this work. Conversion efficiency at second harmonic generation followed by sum frequency generation was realized to be as high as 48±2 %, converting the fundamental radiation in the infrared at a wavelength of 1064 nm to a radiation in the ultraviolet at a wavelength of 355 nm. The realized conversion efficiency overcomes studies conducted in the past and fulfills the requirements as stated by the European Space Agency. Further on, the conducted experiments like laser calorimetry and detection of wavefront deformations during frequency conversion, as well as a longterm experiment, revealed the excellent optical properties of the BiBO crystals. A potential drawback of BiBO crystals could be the lower damage threshold when compared to LBO crystals and further research needs to be conducted on this topic. In KTP crystals, highly efficient generation of second harmonic radiation at a wavelength of 532 nm and a conversion efficiency of 76±3 % was demonstrated. A method to detect gray-tracking in situ is presented within this thesis and the formation of color centers during longterm operation is observed. It is revealed that the gray-tracking could be a limiting factor for a spaceborne application due to the change in absorption and the resulting changes in thermal lensing.

Item URL in elib:https://elib.dlr.de/90815/
Document Type:Thesis (Diploma)
Title:Nonlinear Optical Frequency Conversion for Lasers in Space
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Potreck, ArneDLR StuttgartUNSPECIFIED
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Nonlinear crystals, frequency conversion, KTP, BiBO
Institution:Eberhard-Karls Universität Tübingen
Department:Institut für Astronomie und Astrophysik
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics > Active Optical Systems
Deposited By: Schröder, Dr.rer.nat. Helmut
Deposited On:22 Oct 2014 14:19
Last Modified:31 Jul 2019 19:48

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