<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>1939</id>
    <completedYear>2021</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>1</pageLast>
    <pageNumber>1</pageNumber>
    <edition/>
    <issue/>
    <volume>2021</volume>
    <type>other</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation>TH Aschaffenburg</creatingCorporation>
    <contributingCorporation>Wrexham Glyndwr University</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-09-24</completedDate>
    <publishedDate>2021-09-21</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Optical characterization of reflective coatings for astronomical telescope mirrors</title>
    <abstract language="eng">With ground based optical telescopes astronomers observe celestial objects over a wide spectral range. As usually three or even more reflections at telescope mirrors are involved, good reflection properties  of the mirror coatings are important. The aluminum evaporation technique has been - and is still - the standard solution for the reflective coatings of large astronomical mirrors. Such coatings have excellent reflectivity in the ultraviolet and in the visible, but perform poorly in the infrared. Silver is the metal having highest reflectivity for wavelengths longward of 400 nm, but isn´t the best choice for reflectivity in the ultraviolet and for blue light. To avoid degradation by oxidation, durable silver coatings need to be protected by transmitting overcoating layers. In the presented study, different metallic coatings – including unusual ones like sputtered iridium - are characterized to identify a coating that is most suitable for the spectral range from ultraviolet to infrared. Experimental results are compared to simulations based on the complex refractive indices of these materials. Thereby dependence of incidence angle and polarization is also considered.</abstract>
    <abstract language="deu">Poster</abstract>
    <parentTitle language="eng">DGaO Jahrestagung</parentTitle>
    <identifier type="url">https://dgao.de/jahrestagung/</identifier>
    <enrichment key="copyright">1</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Thorsten Döhring</author>
    <author>Claudius Rödling</author>
    <author>Kevin Kimmel</author>
    <author>Sebastian Zeising</author>
    <author>Johannes Stadtmüller</author>
    <author>Manfred Stollenwerk</author>
    <author>Shruti Verma</author>
    <author>Paul Rees</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>mirror</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>coating</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>iridium</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>astronomy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>telescope</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Spiegelteleskop</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
    <file>https://opus4.kobv.de/opus4-h-ab/files/1939/DGaO_Poster_P4_NIR_coatings.pdf</file>
  </doc>
  <doc>
    <id>1974</id>
    <completedYear>2021</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>1</pageLast>
    <pageNumber>2</pageNumber>
    <edition/>
    <issue>122</issue>
    <volume>2021</volume>
    <type>conferenceobject</type>
    <publisherName>DGaO</publisherName>
    <publisherPlace/>
    <creatingCorporation>TH Aschaffenburg</creatingCorporation>
    <contributingCorporation>Wrexham Glyndwr University</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-12-04</completedDate>
    <publishedDate>2021-12-01</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Optical characterization of reflective coatings for astronomical telescope mirrors</title>
    <abstract language="eng">Aluminium evaporation is still the standard solution for reflective coatings of large astronomical mirrors. Silver and gold are also used in specific cases depending on the targeted wavelength. This study characterized different metallic coatings - including unusual ones like sputtered iridium - to identify the most suitable mirror coating for the spectral range from ultraviolet to infrared wavelengths.</abstract>
    <parentTitle language="eng">DGaO Proceedings</parentTitle>
    <identifier type="issn">1614-8436</identifier>
    <identifier type="url">https://www.dgao-proceedings.de/download/122/122_p4.pdf</identifier>
    <enrichment key="copyright">1</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Thorsten Döhring</author>
    <author>Claudius Rödling</author>
    <author>Kevin Kimmel</author>
    <author>Sebastian Zeising</author>
    <author>Johannes Stadtmüller</author>
    <author>Manfred Stollenwerk</author>
    <author>Shruti Verma</author>
    <author>Paul Rees</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Iridium</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>mirror</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>coating</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>reflectivity</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>telescope</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Spiegelteleskop</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
    <file>https://opus4.kobv.de/opus4-h-ab/files/1974/122_p4.pdf</file>
  </doc>
  <doc>
    <id>1866</id>
    <completedYear>2021</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1177605-1</pageFirst>
    <pageLast>1177605-8</pageLast>
    <pageNumber>8</pageNumber>
    <edition/>
    <issue>11776</issue>
    <volume>2021</volume>
    <type>conferenceobject</type>
    <publisherName>SPIE</publisherName>
    <publisherPlace/>
    <creatingCorporation>Czech Technical University in Prague</creatingCorporation>
    <contributingCorporation>TH Aschaffenburg</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-05-24</completedDate>
    <publishedDate>2021-04-18</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Lobster eye type X-ray telescope with chromium-iridium coated tri-layer mirrors</title>
    <abstract language="eng">For space-born astronomical X-ray telescopes, iridium-based reflective layer systems are known as highly effective&#13;
mirrors coatings. During the recent years, Aschaffenburg University of Applied Sciences and the Czech Technical&#13;
University in Prague jointly developed stress compensated chromium-iridium coatings for this application. To overcome the disturbing reflectivity reduction of the iridium absorption edge around 2 keV photon energy, thin overcoat layers of chromium were applied in addition. Now a prototype of a wide-field, imaging X-ray telescope&#13;
of Lobster Eye type is assembled at the company RIGAKU. For this purpose a small series of 34 mirrors based on 100 x 50 mm semiconductor grade silicon substrates has been coated at Aschaffenburg University. The applied tri-layer system consists of a stack of 40 nm chromium, which act as adhesive layer and compensates layer stress, a 30 nm iridium thick reflective layer, and an additional overcoat layer of 6 nm chromium. This layer system&#13;
have been analysed by AFM and TEM images. The mirrors are assembled into an aluminium frame to build a 2D Lobster Eye type telescope. The designed focal length of this wide field X-ray telescope is two meter. To study the performance of the tri-layer coating system, a twin LE telescope with convenient gold coatings was manufactured also. Performance measurements of both telescopes and under same conditions are planned at the PANTER test facility at the Max-Planck Institute for Extraterrestrial Physics. First experimental results,&#13;
their comparison with theoretical simulations and the comparison between both models will be presented in this contribution.</abstract>
    <parentTitle language="eng">Proceedings of SPIE</parentTitle>
    <identifier type="doi">https://doi.org/10.1117/12.2589266</identifier>
    <enrichment key="copyright">1</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Veronika Stehlikova</author>
    <author>Thorsten Döhring</author>
    <author>Manfred Stollenwerk</author>
    <author>Johannes Stadtmüller</author>
    <author>Veronika Marsikova</author>
    <author>Rene Hudec</author>
    <author>Dennis Flachs</author>
    <author>Vadim Burwitz</author>
    <author>Gisela Hartner</author>
    <author>Surangkhana Rukdee</author>
    <author>Thomas Müller</author>
    <author>Thomas Schmidt</author>
    <author>Adolf Inneman</author>
    <author>Mariana Klementova</author>
    <author>Sebastian Zeising</author>
    <author>Andreas Langmeier</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>telescope</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Lobster Eye</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>X-ray</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>mirror</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>iridium</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Röntgenteleskop</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Röntgenspiegel</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
  </doc>
  <doc>
    <id>1865</id>
    <completedYear>2021</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1177607-1</pageFirst>
    <pageLast>11776076</pageLast>
    <pageNumber>8</pageNumber>
    <edition/>
    <issue>11776</issue>
    <volume>2021</volume>
    <type>conferenceobject</type>
    <publisherName>SPIE</publisherName>
    <publisherPlace/>
    <creatingCorporation>TH Aschaffenburg</creatingCorporation>
    <contributingCorporation>Physikalisch-Technische Bundesanstalt</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-05-24</completedDate>
    <publishedDate>2021-04-18</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Characterisation of X-ray mirrors based on  chromium-iridium tri-layer coatings</title>
    <abstract language="eng">Iridium-based layer systems are highly effective mirror coatings for space-born X-ray telescopes. During the recent years, Aschaffenburg University of Applied Sciences and its partners developed stress compensated chromium-iridium coatings for such astronomical applications, using chromium as an adhesive layer between iridium reflective layer and mirror substrate. However, there was room for improvement: To overcome the disturbing reflectivity reduction of the iridium absorption edge around 2 keV photon energy, thin overcoat layers of chromium are applied in addition now. This layer system has been analyzed by atomic force microscopy and transmission electron microscopy images. Furthermore, the reflectivity of such innovative X-ray mirrors based on chromium-iridium tri-layer coatings was recently measured at PTB's four-crystal monochromator beamline at the synchrotron radiation facility BESSY II.  The experimental results, obtained for photon energies between 1.9 keV and 11 keV at two grazing incidence angles (0.6 degree and 0.9 degree) and their comparison with corresponding simulations are presented in this contribution. When compared to simulations of pure iridium coatings, a significantly higher reflectivity was achieved especially in the soft X-ray regime between 2 keV and 4 keV. Such chromium-iridium tri-layer coatings have high potential to increase the effective area for X-ray telescopes in Lobster Eye Design, for Wolter-I type X-ray optics, and for silicon pore optics as considered for the ATHENA telescope of the European Space Agency.</abstract>
    <parentTitle language="eng">Proceedings of SPIE</parentTitle>
    <identifier type="doi">https://doi.org/10.1117/12.2592551</identifier>
    <enrichment key="copyright">1</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Thorsten Döhring</author>
    <author>Manfred Stollenwerk</author>
    <author>Johannes Stadtmüller</author>
    <author>Sebastian Zeising</author>
    <author>Dennis Flachs</author>
    <author>Veronika Stehlikova</author>
    <author>Vadim Burwitz</author>
    <author>Michael K. Krumrey</author>
    <author>Vincenzo Cotroneo</author>
    <author>Mariana Klementova</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>iridium</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>mirror</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>X-ray</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>coating</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>telescope</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Röntgenspiegel</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Röntgenteleskop</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Iridium</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
  </doc>
</export-example>
