Frequency and duty cycle modulation optimization in minimizing thermal accumulation effect in Z-scan measurement with high-repetition-rate laser
In this study, we demonstrate the optimization of the chopper frequency and duty cycle in a Z-scan measurement with a 250 MHz high-repetition-rate (HRR) femtosecond laser to minimize the thermal lensing effect due to cumulative heating of the sample. The result shows that such minimization can be ac...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Japan Society of Applied Physics
2014
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| Online Access: | http://psasir.upm.edu.my/id/eprint/37717/1/Frequency%20and%20duty%20cycle%20modulation%20optimization%20in%20minimizing%20thermal%20accumulation%20effect%20in%20Z.pdf |
| _version_ | 1796973203399114752 |
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| author | Zainal Abidin, Mohd Shahnan Muhammad Noor, Ahmad Shukri Abdul Rashid, Suraya Mahdi, Mohd Adzir |
| author_facet | Zainal Abidin, Mohd Shahnan Muhammad Noor, Ahmad Shukri Abdul Rashid, Suraya Mahdi, Mohd Adzir |
| author_sort | Zainal Abidin, Mohd Shahnan |
| collection | UPM |
| description | In this study, we demonstrate the optimization of the chopper frequency and duty cycle in a Z-scan measurement with a 250 MHz high-repetition-rate (HRR) femtosecond laser to minimize the thermal lensing effect due to cumulative heating of the sample. The result shows that such minimization can be achieved by keeping the modulated exposure time on the sample shorter than the thermal diffusivity decay time tc. The minimum chopper frequency fmin is predicted by relating the duty cycle factor F with tc, while maintaining stable peak and valley transmittances, i.e., ΔTp and ΔTv, respectively. Furthermore, a lower fmin is obtained by taking a stable range of the peak–valley difference ΔTpv into consideration. The optimization allows for the low operational modulation frequency of Z-scan measurement with reduced thermal influence, thus enabling simple management of the thermal lensing effect. |
| first_indexed | 2024-03-06T08:39:11Z |
| format | Article |
| id | upm.eprints-37717 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T08:39:11Z |
| publishDate | 2014 |
| publisher | Japan Society of Applied Physics |
| record_format | dspace |
| spelling | upm.eprints-377172015-11-11T04:47:31Z http://psasir.upm.edu.my/id/eprint/37717/ Frequency and duty cycle modulation optimization in minimizing thermal accumulation effect in Z-scan measurement with high-repetition-rate laser Zainal Abidin, Mohd Shahnan Muhammad Noor, Ahmad Shukri Abdul Rashid, Suraya Mahdi, Mohd Adzir In this study, we demonstrate the optimization of the chopper frequency and duty cycle in a Z-scan measurement with a 250 MHz high-repetition-rate (HRR) femtosecond laser to minimize the thermal lensing effect due to cumulative heating of the sample. The result shows that such minimization can be achieved by keeping the modulated exposure time on the sample shorter than the thermal diffusivity decay time tc. The minimum chopper frequency fmin is predicted by relating the duty cycle factor F with tc, while maintaining stable peak and valley transmittances, i.e., ΔTp and ΔTv, respectively. Furthermore, a lower fmin is obtained by taking a stable range of the peak–valley difference ΔTpv into consideration. The optimization allows for the low operational modulation frequency of Z-scan measurement with reduced thermal influence, thus enabling simple management of the thermal lensing effect. Japan Society of Applied Physics 2014-11 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/37717/1/Frequency%20and%20duty%20cycle%20modulation%20optimization%20in%20minimizing%20thermal%20accumulation%20effect%20in%20Z.pdf Zainal Abidin, Mohd Shahnan and Muhammad Noor, Ahmad Shukri and Abdul Rashid, Suraya and Mahdi, Mohd Adzir (2014) Frequency and duty cycle modulation optimization in minimizing thermal accumulation effect in Z-scan measurement with high-repetition-rate laser. Japanese Journal of Applied Physics, 53 (11). art. no. 112702. pp. 1-4. ISSN 0021-4922; ESSN: 1347-4065 10.7567/JJAP.53.112702 |
| spellingShingle | Zainal Abidin, Mohd Shahnan Muhammad Noor, Ahmad Shukri Abdul Rashid, Suraya Mahdi, Mohd Adzir Frequency and duty cycle modulation optimization in minimizing thermal accumulation effect in Z-scan measurement with high-repetition-rate laser |
| title | Frequency and duty cycle modulation optimization in minimizing thermal accumulation effect in Z-scan measurement with high-repetition-rate laser |
| title_full | Frequency and duty cycle modulation optimization in minimizing thermal accumulation effect in Z-scan measurement with high-repetition-rate laser |
| title_fullStr | Frequency and duty cycle modulation optimization in minimizing thermal accumulation effect in Z-scan measurement with high-repetition-rate laser |
| title_full_unstemmed | Frequency and duty cycle modulation optimization in minimizing thermal accumulation effect in Z-scan measurement with high-repetition-rate laser |
| title_short | Frequency and duty cycle modulation optimization in minimizing thermal accumulation effect in Z-scan measurement with high-repetition-rate laser |
| title_sort | frequency and duty cycle modulation optimization in minimizing thermal accumulation effect in z scan measurement with high repetition rate laser |
| url | http://psasir.upm.edu.my/id/eprint/37717/1/Frequency%20and%20duty%20cycle%20modulation%20optimization%20in%20minimizing%20thermal%20accumulation%20effect%20in%20Z.pdf |
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