Pulse-shaping of nanosecond pulse laser by means of thermal lens effect
With pump-probe separated closed aperture Z-scan technique, nonlinear refraction can be detected and taken into account with transmittance signal of probe beam. Because the transmittance change induced by nanosecond pump pulse is temporal, temporal profile of probe pulse also changes with the therma...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2014-07-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/80/815/80_2014tep0200/_pdf/-char/en |
| _version_ | 1811225025262387200 |
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| author | Byunggi KIM Ryota INOUE Hong Duc DOAN Kazuyoshi FUSHINOBU |
| author_facet | Byunggi KIM Ryota INOUE Hong Duc DOAN Kazuyoshi FUSHINOBU |
| author_sort | Byunggi KIM |
| collection | DOAJ |
| description | With pump-probe separated closed aperture Z-scan technique, nonlinear refraction can be detected and taken into account with transmittance signal of probe beam. Because the transmittance change induced by nanosecond pump pulse is temporal, temporal profile of probe pulse also changes with the thermal lens effect rising. In this study, a new concept for pulse shaping of nanosecond laser with thermal lens effect is discussed in terms of nonlinear optics. The rising of thermal lens effect in nanosecond regime is demonstrated by time-resolved measurement and theoretical model. Theoretical model that accounts for unsteady heat conduction and generation of acoustic wave in liquid sample shows good agreement with experimental results. As pump beam waist gets narrow, rising time of thermal lens effect becomes faster. It means drastic temporal change of transmittance is obtainable and controllable. Using this knowledge, temporal pulse-shaping of nanosecond laser pulse is tried in terms of pulse compression. It is shown that 7 ns pulse can be compressed by 30.0% in the present configuration theoretically. Also, experimental results show 32.2 ns pulse can be compressed by 21.7%. |
| first_indexed | 2024-04-12T08:59:57Z |
| format | Article |
| id | doaj.art-f8d1cc455c5947a18d34b4f810e1e908 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T08:59:57Z |
| publishDate | 2014-07-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-f8d1cc455c5947a18d34b4f810e1e9082022-12-22T03:39:17ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612014-07-0180815TEP0200TEP020010.1299/transjsme.2014tep0200transjsmePulse-shaping of nanosecond pulse laser by means of thermal lens effectByunggi KIM0Ryota INOUE1Hong Duc DOAN2Kazuyoshi FUSHINOBU3Tokyo Institute of Technology, Dept. of Mechanical and Control EngineeringTokyo Institute of Technology, Dept. of Mechanical and Control EngineeringTokyo Institute of Technology, Dept. of Mechanical and Control EngineeringTokyo Institute of Technology, Dept. of Mechanical and Control EngineeringWith pump-probe separated closed aperture Z-scan technique, nonlinear refraction can be detected and taken into account with transmittance signal of probe beam. Because the transmittance change induced by nanosecond pump pulse is temporal, temporal profile of probe pulse also changes with the thermal lens effect rising. In this study, a new concept for pulse shaping of nanosecond laser with thermal lens effect is discussed in terms of nonlinear optics. The rising of thermal lens effect in nanosecond regime is demonstrated by time-resolved measurement and theoretical model. Theoretical model that accounts for unsteady heat conduction and generation of acoustic wave in liquid sample shows good agreement with experimental results. As pump beam waist gets narrow, rising time of thermal lens effect becomes faster. It means drastic temporal change of transmittance is obtainable and controllable. Using this knowledge, temporal pulse-shaping of nanosecond laser pulse is tried in terms of pulse compression. It is shown that 7 ns pulse can be compressed by 30.0% in the present configuration theoretically. Also, experimental results show 32.2 ns pulse can be compressed by 21.7%.https://www.jstage.jst.go.jp/article/transjsme/80/815/80_2014tep0200/_pdf/-char/enthermal lens effectclosed aperture z-scanfluidic optical devicesnanosecond pulsed laserpulse compression |
| spellingShingle | Byunggi KIM Ryota INOUE Hong Duc DOAN Kazuyoshi FUSHINOBU Pulse-shaping of nanosecond pulse laser by means of thermal lens effect Nihon Kikai Gakkai ronbunshu thermal lens effect closed aperture z-scan fluidic optical devices nanosecond pulsed laser pulse compression |
| title | Pulse-shaping of nanosecond pulse laser by means of thermal lens effect |
| title_full | Pulse-shaping of nanosecond pulse laser by means of thermal lens effect |
| title_fullStr | Pulse-shaping of nanosecond pulse laser by means of thermal lens effect |
| title_full_unstemmed | Pulse-shaping of nanosecond pulse laser by means of thermal lens effect |
| title_short | Pulse-shaping of nanosecond pulse laser by means of thermal lens effect |
| title_sort | pulse shaping of nanosecond pulse laser by means of thermal lens effect |
| topic | thermal lens effect closed aperture z-scan fluidic optical devices nanosecond pulsed laser pulse compression |
| url | https://www.jstage.jst.go.jp/article/transjsme/80/815/80_2014tep0200/_pdf/-char/en |
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