Observation of reverse saturable absorption of an X-ray laser
A nonlinear absorber in which the excited state absorption is larger than the ground state can undergo a process called reverse saturable absorption (RSA). It is a well-known phenomenon in laser physics in the optical regime, but is more difficult to generate in the x-ray regime, where fast non-radi...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
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American Physical Society
2017
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| _version_ | 1797105208142069760 |
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| author | Cho, BI Cho, MS Kim, M Chung, H-K Barbrel, B Engelhorn, K Burian, T Chalupský, S Ciricosta, O Davovski, GL Hájková, V Holmes, M Juha, L Krzywinski, J Lee, RW Nam, CH Rackstraw, DS Toleikis, S Turner, JJ Vinko, SM Wark, JS Zastrau, U Heimann, PA |
| author_facet | Cho, BI Cho, MS Kim, M Chung, H-K Barbrel, B Engelhorn, K Burian, T Chalupský, S Ciricosta, O Davovski, GL Hájková, V Holmes, M Juha, L Krzywinski, J Lee, RW Nam, CH Rackstraw, DS Toleikis, S Turner, JJ Vinko, SM Wark, JS Zastrau, U Heimann, PA |
| author_sort | Cho, BI |
| collection | OXFORD |
| description | A nonlinear absorber in which the excited state absorption is larger than the ground state can undergo a process called reverse saturable absorption (RSA). It is a well-known phenomenon in laser physics in the optical regime, but is more difficult to generate in the x-ray regime, where fast non-radiative core electron transitions typically dominate the population kinetics during light matter interactions. Here, we report the first observation of decreasing x-ray transmission in a solid target pumped by intense x-ray free electron laser pulses. The measurement has been made below the K-absorption edge of aluminum, and the x-ray intensity ranges are 10^16~17 W/cm2. It has been confirmed by collisional radiative population kinetic calculations, underscoring the fast spectral modulation of the x-ray pulses and charge states relevant to the absorption and transmission of x-ray photons. The processes shown through detailed simulations are consistent with reverse saturable absorption, which would be the first observation of this phenomena in the x-ray regime. These light matter interactions provide a unique opportunity to investigate optical transport properties in extreme state of matters, as well as affording the potential to regulate ultrafast XFEL pulses. |
| first_indexed | 2024-03-07T06:44:12Z |
| format | Journal article |
| id | oxford-uuid:fa51a8ae-bc30-4725-bf66-84a5a6f0c799 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:44:12Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:fa51a8ae-bc30-4725-bf66-84a5a6f0c7992022-03-27T13:04:54ZObservation of reverse saturable absorption of an X-ray laserJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:fa51a8ae-bc30-4725-bf66-84a5a6f0c799Symplectic Elements at OxfordAmerican Physical Society2017Cho, BICho, MSKim, MChung, H-KBarbrel, BEngelhorn, KBurian, TChalupský, SCiricosta, ODavovski, GLHájková, VHolmes, MJuha, LKrzywinski, JLee, RWNam, CHRackstraw, DSToleikis, STurner, JJVinko, SMWark, JSZastrau, UHeimann, PAA nonlinear absorber in which the excited state absorption is larger than the ground state can undergo a process called reverse saturable absorption (RSA). It is a well-known phenomenon in laser physics in the optical regime, but is more difficult to generate in the x-ray regime, where fast non-radiative core electron transitions typically dominate the population kinetics during light matter interactions. Here, we report the first observation of decreasing x-ray transmission in a solid target pumped by intense x-ray free electron laser pulses. The measurement has been made below the K-absorption edge of aluminum, and the x-ray intensity ranges are 10^16~17 W/cm2. It has been confirmed by collisional radiative population kinetic calculations, underscoring the fast spectral modulation of the x-ray pulses and charge states relevant to the absorption and transmission of x-ray photons. The processes shown through detailed simulations are consistent with reverse saturable absorption, which would be the first observation of this phenomena in the x-ray regime. These light matter interactions provide a unique opportunity to investigate optical transport properties in extreme state of matters, as well as affording the potential to regulate ultrafast XFEL pulses. |
| spellingShingle | Cho, BI Cho, MS Kim, M Chung, H-K Barbrel, B Engelhorn, K Burian, T Chalupský, S Ciricosta, O Davovski, GL Hájková, V Holmes, M Juha, L Krzywinski, J Lee, RW Nam, CH Rackstraw, DS Toleikis, S Turner, JJ Vinko, SM Wark, JS Zastrau, U Heimann, PA Observation of reverse saturable absorption of an X-ray laser |
| title | Observation of reverse saturable absorption of an X-ray laser |
| title_full | Observation of reverse saturable absorption of an X-ray laser |
| title_fullStr | Observation of reverse saturable absorption of an X-ray laser |
| title_full_unstemmed | Observation of reverse saturable absorption of an X-ray laser |
| title_short | Observation of reverse saturable absorption of an X-ray laser |
| title_sort | observation of reverse saturable absorption of an x ray laser |
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