Pulse Burst Generation and Diffraction with Spatial Light Modulators for Dynamic Ultrafast Laser Materials Processing
A pulse burst optical system has been developed, able to alter an energetic, ultrafast 10 ps, 5 kHz output pulse train to 323 MHz intra-burst frequency at the fundamental 5 kHz repetition rate. An optical delay line consisting of a beam-splitting polariser cube, mirrors, and waveplates transforms a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-12-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/24/9059 |
| _version_ | 1797456510967611392 |
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| author | Zheng Fang Tong Zhou Walter Perrie Matthew Bilton Jörg Schille Udo Löschner Stuart Edwardson Geoff Dearden |
| author_facet | Zheng Fang Tong Zhou Walter Perrie Matthew Bilton Jörg Schille Udo Löschner Stuart Edwardson Geoff Dearden |
| author_sort | Zheng Fang |
| collection | DOAJ |
| description | A pulse burst optical system has been developed, able to alter an energetic, ultrafast 10 ps, 5 kHz output pulse train to 323 MHz intra-burst frequency at the fundamental 5 kHz repetition rate. An optical delay line consisting of a beam-splitting polariser cube, mirrors, and waveplates transforms a high-energy pulse into a pulse burst, circulating around the delay line. Interestingly, the reflected first pulse and subsequent pulses from the delay line have orthogonal linear polarisations. This fact allows independent modulation of these pulses using two-phase-only Spatial Light Modulators (SLM) when their directors are also aligned orthogonally. With hybrid Computer Generated Holograms (CGH) addressed to the SLMs, we demonstrate simultaneous multi-spot periodic surface micro-structuring on stainless steel with orthogonal linear polarisations and cylindrical vector (CV) beams with Radial and Azimuthal polarisations. Burst processing produces a major change in resulting surface texture due to plasma absorption on the nanosecond time scale; hence the ablation rates on stainless steel with pulse bursts are always lower than 5 kHz processing. By synchronising the scan motion and CGH application, we show simultaneous independent multi-beam real-time processing with pulse bursts having orthogonal linear polarisations. This novel technique extends the flexibility of parallel beam surface micro-structuring with adaptive optics. |
| first_indexed | 2024-03-09T16:08:51Z |
| format | Article |
| id | doaj.art-3849e904b03548a09cb5f9bbb3bc4956 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T16:08:51Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-3849e904b03548a09cb5f9bbb3bc49562023-11-24T16:26:25ZengMDPI AGMaterials1996-19442022-12-011524905910.3390/ma15249059Pulse Burst Generation and Diffraction with Spatial Light Modulators for Dynamic Ultrafast Laser Materials ProcessingZheng Fang0Tong Zhou1Walter Perrie2Matthew Bilton3Jörg Schille4Udo Löschner5Stuart Edwardson6Geoff Dearden7Laser Group, School of Engineering, University of Liverpool, Brownlow Street, Liverpool L69 3GH, UKCollege of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaLaser Group, School of Engineering, University of Liverpool, Brownlow Street, Liverpool L69 3GH, UKSEM Shared Research Facility, University of Liverpool, Liverpool L69 3GH, UKLaserinstitut Hochschule Mittweida, University of Applied Sciences, Technikumplatz 17, 09468 Mittweida, GermanyLaserinstitut Hochschule Mittweida, University of Applied Sciences, Technikumplatz 17, 09468 Mittweida, GermanyLaser Group, School of Engineering, University of Liverpool, Brownlow Street, Liverpool L69 3GH, UKLaser Group, School of Engineering, University of Liverpool, Brownlow Street, Liverpool L69 3GH, UKA pulse burst optical system has been developed, able to alter an energetic, ultrafast 10 ps, 5 kHz output pulse train to 323 MHz intra-burst frequency at the fundamental 5 kHz repetition rate. An optical delay line consisting of a beam-splitting polariser cube, mirrors, and waveplates transforms a high-energy pulse into a pulse burst, circulating around the delay line. Interestingly, the reflected first pulse and subsequent pulses from the delay line have orthogonal linear polarisations. This fact allows independent modulation of these pulses using two-phase-only Spatial Light Modulators (SLM) when their directors are also aligned orthogonally. With hybrid Computer Generated Holograms (CGH) addressed to the SLMs, we demonstrate simultaneous multi-spot periodic surface micro-structuring on stainless steel with orthogonal linear polarisations and cylindrical vector (CV) beams with Radial and Azimuthal polarisations. Burst processing produces a major change in resulting surface texture due to plasma absorption on the nanosecond time scale; hence the ablation rates on stainless steel with pulse bursts are always lower than 5 kHz processing. By synchronising the scan motion and CGH application, we show simultaneous independent multi-beam real-time processing with pulse bursts having orthogonal linear polarisations. This novel technique extends the flexibility of parallel beam surface micro-structuring with adaptive optics.https://www.mdpi.com/1996-1944/15/24/9059ultrafastmaterials micro-structuringspatial light modulatorspulse burst processinglaser induced periodic surface structures (LIPSS) |
| spellingShingle | Zheng Fang Tong Zhou Walter Perrie Matthew Bilton Jörg Schille Udo Löschner Stuart Edwardson Geoff Dearden Pulse Burst Generation and Diffraction with Spatial Light Modulators for Dynamic Ultrafast Laser Materials Processing Materials ultrafast materials micro-structuring spatial light modulators pulse burst processing laser induced periodic surface structures (LIPSS) |
| title | Pulse Burst Generation and Diffraction with Spatial Light Modulators for Dynamic Ultrafast Laser Materials Processing |
| title_full | Pulse Burst Generation and Diffraction with Spatial Light Modulators for Dynamic Ultrafast Laser Materials Processing |
| title_fullStr | Pulse Burst Generation and Diffraction with Spatial Light Modulators for Dynamic Ultrafast Laser Materials Processing |
| title_full_unstemmed | Pulse Burst Generation and Diffraction with Spatial Light Modulators for Dynamic Ultrafast Laser Materials Processing |
| title_short | Pulse Burst Generation and Diffraction with Spatial Light Modulators for Dynamic Ultrafast Laser Materials Processing |
| title_sort | pulse burst generation and diffraction with spatial light modulators for dynamic ultrafast laser materials processing |
| topic | ultrafast materials micro-structuring spatial light modulators pulse burst processing laser induced periodic surface structures (LIPSS) |
| url | https://www.mdpi.com/1996-1944/15/24/9059 |
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