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Investigation of the dynamics of a versatile laser amplifier upon fast modulation of its CW and pulsed seed sources.

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Title: Investigation of the dynamics of a versatile laser amplifier upon fast modulation of its CW and pulsed seed sources.
Authors: Schmittner, Christian1 (AUTHOR) christian-peter.schmittner@ifsw.uni-stuttgart.de, Reiff, Colin2 (AUTHOR), Hoßfeld, Max3 (AUTHOR), Graf, Thomas1 (AUTHOR), Abdou Ahmed, Marwan1 (AUTHOR)
Source: Applied Physics B: Lasers & Optics. Mar2026, Vol. 132 Issue 3, p1-8. 8p.
Subjects: Active medium, Optical amplifiers, Transient analysis, Optical modulation, Mathematical models
Abstract: This paper presents an investigation of the dynamics of a versatile thin-disk multipass laser amplifier (TDMPA) with two seed sources. The study focused on the system's transient response, analyzing the amplified instantaneous power during and shortly after fast modulation of the individual seed powers. For switching times shorter than the amplifier's characteristic response time, changes in the total seed power led to retardation and overshooting effects, which are attributed to the gain-saturation dynamics of the active laser medium. An analytical formula to express the dependence of the characteristic response time on the input and output powers and the specific TDMPA architecture was derived and validated. This provides a practical guideline for choosing seed-power switching times that avoid transient overshooting and retardation effects. For pump powers between 599 and 1446 W, and depending on operation conditions, the TDMPA under consideration was measured to exhibit a gain-saturation response time ranging between approximately 30 and 90 µs. [ABSTRACT FROM AUTHOR]
Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 192432790
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Investigation of the dynamics of a versatile laser amplifier upon fast modulation of its CW and pulsed seed sources.
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  Data: <searchLink fieldCode="AR" term="%22Schmittner%2C+Christian%22">Schmittner, Christian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> christian-peter.schmittner@ifsw.uni-stuttgart.de</i><br /><searchLink fieldCode="AR" term="%22Reiff%2C+Colin%22">Reiff, Colin</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hoßfeld%2C+Max%22">Hoßfeld, Max</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Graf%2C+Thomas%22">Graf, Thomas</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abdou+Ahmed%2C+Marwan%22">Abdou Ahmed, Marwan</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Applied+Physics+B%3A+Lasers+%26+Optics%22">Applied Physics B: Lasers & Optics</searchLink>. Mar2026, Vol. 132 Issue 3, p1-8. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Active+medium%22">Active medium</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+amplifiers%22">Optical amplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Transient+analysis%22">Transient analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+modulation%22">Optical modulation</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematical+models%22">Mathematical models</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This paper presents an investigation of the dynamics of a versatile thin-disk multipass laser amplifier (TDMPA) with two seed sources. The study focused on the system's transient response, analyzing the amplified instantaneous power during and shortly after fast modulation of the individual seed powers. For switching times shorter than the amplifier's characteristic response time, changes in the total seed power led to retardation and overshooting effects, which are attributed to the gain-saturation dynamics of the active laser medium. An analytical formula to express the dependence of the characteristic response time on the input and output powers and the specific TDMPA architecture was derived and validated. This provides a practical guideline for choosing seed-power switching times that avoid transient overshooting and retardation effects. For pump powers between 599 and 1446 W, and depending on operation conditions, the TDMPA under consideration was measured to exhibit a gain-saturation response time ranging between approximately 30 and 90 µs. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s00340-026-08632-1
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      – Code: eng
        Text: English
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      – SubjectFull: Active medium
        Type: general
      – SubjectFull: Optical amplifiers
        Type: general
      – SubjectFull: Transient analysis
        Type: general
      – SubjectFull: Optical modulation
        Type: general
      – SubjectFull: Mathematical models
        Type: general
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      – TitleFull: Investigation of the dynamics of a versatile laser amplifier upon fast modulation of its CW and pulsed seed sources.
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            NameFull: Schmittner, Christian
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            NameFull: Reiff, Colin
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            NameFull: Hoßfeld, Max
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            NameFull: Graf, Thomas
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            NameFull: Abdou Ahmed, Marwan
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            – D: 01
              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
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            – TitleFull: Applied Physics B: Lasers & Optics
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