Variable repetition frequency asynchronous optical sampling method without a feedback loop

Nagakubo, A.; Kanai, K.; Tamura, H.; Tange, A.; Ogi, H.

doi:https://doi.org/10.1063/5.0083354

Variable repetition frequency asynchronous optical sampling method without a feedback loop

Nagakubo, A.; Kanai, K.; Tamura, H. et al.

AIP Advances, 2022, 12, 045323

アクセス数:488件（2025-08-23 10:29 集計）

固定URL: https://hdl.handle.net/11094/93314

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タイトル	Variable repetition frequency asynchronous optical sampling method without a feedback loop
著者	NRID 1000070751113 1000070751113 ORCID 0000-0001-7494-5099 0000-0001-7494-5099 researchmap permalink nagakubo nagakubo Scopus Author ID 55329400300 55329400300 著者名 Nagakubo, A.
	著者名 Kanai, K.
	著者名 Tamura, H.
	著者名 Tange, A.
	NRID 1000090252626 1000090252626 researchmap permalink read0042771 read0042771 Scopus Author ID 35563683500 35563683500 著者名 Ogi, H.
内容	Nagakubo A., Kanai K., Tamura H., et al. Variable repetition frequency asynchronous optical sampling method without a feedback loop. AIP Advances 12, 045323 (2022); https://doi.org/10.1063/5.0083354.
抄録	The ultrafast pump-probe measurement represents a key technique to study fs-ps dynamics. The asynchronous optical sampling (ASOPS) method realizes fast and long time-range measurement with high time resolution using different repetition frequency pump-probe light pulses. The frequency difference Δf is an important parameter, as it dictates the measurement time and time resolution. However, usual ASOPS measurements require a complex and precise stabilizer to control Δf or it is difficult to change Δf. In this study, we use two free-running titanium/sapphire pulse lasers to develop a variable repetition frequency ASOPS (VRF-ASOPS) method without a stabilizer or feedback loop, where we can easily alter Δf by changing the cavity length of the probe light laser. To detect the coincidences of the pump-probe light pulses, we cause the instantaneous reflectivity change in a 100 nm platinum film by irradiating the pump light and observe it by the probe light. We use this signal as the trigger signal to directly determine Δf, which enables us to average and convert the measured responses without a stabilizer or feedback loop. Using this VRF-ASOPS system, we obtain pulse echo signals and 100 GHz Brillouin oscillations, which are equivalent to those measured by the mechanical delay line method, confirming the validity of our developed method.
出版者	American Institute of Physics Inc.
収録物名	AIP Advances
巻(号)	12
ページ	045323
刊行年月	2022-04-22
言語	英語
ハンドルURL	https://hdl.handle.net/11094/93314
eISSN	21583226
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1063/5.0083354
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	AIP Advances. 2022, 12, p. 045323
DC.title	Variable repetition frequency asynchronous optical sampling method without a feedback loop
DC.creator	Nagakubo, A.
	Kanai, K.
	Tamura, H.
	Tange, A.
	Ogi, H.
DC.publisher	American Institute of Physics Inc.
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2022-04-22
DC.identifier	https://doi.org/10.1063/5.0083354
DC.description	Nagakubo A., Kanai K., Tamura H., et al. Variable repetition frequency asynchronous optical sampling method without a feedback loop. AIP Advances 12, 045323 (2022); https://doi.org/10.1063/5.0083354.
DCTERMS.abstract	The ultrafast pump-probe measurement represents a key technique to study fs-ps dynamics. The asynchronous optical sampling (ASOPS) method realizes fast and long time-range measurement with high time resolution using different repetition frequency pump-probe light pulses. The frequency difference Δf is an important parameter, as it dictates the measurement time and time resolution. However, usual ASOPS measurements require a complex and precise stabilizer to control Δf or it is difficult to change Δf. In this study, we use two free-running titanium/sapphire pulse lasers to develop a variable repetition frequency ASOPS (VRF-ASOPS) method without a stabilizer or feedback loop, where we can easily alter Δf by changing the cavity length of the probe light laser. To detect the coincidences of the pump-probe light pulses, we cause the instantaneous reflectivity change in a 100 nm platinum film by irradiating the pump light and observe it by the probe light. We use this signal as the trigger signal to directly determine Δf, which enables us to average and convert the measured responses without a stabilizer or feedback loop. Using this VRF-ASOPS system, we obtain pulse echo signals and 100 GHz Brillouin oscillations, which are equivalent to those measured by the mechanical delay line method, confirming the validity of our developed method.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	93314
citation_title	Variable repetition frequency asynchronous optical sampling method without a feedback loop
citation_author	Nagakubo, A.
	Kanai, K.
	Tamura, H.
	Tange, A.
	Ogi, H.
citation_publisher	American Institute of Physics Inc.
citation_language	英語
citation_date	2022-04-22
citation_journal_title	AIP Advances
citation_volume	12
citation_firstpage	045323
citation_doi	https://doi.org/10.1063/5.0083354
citation_public_url	https://hdl.handle.net/11094/93314

Variable repetition frequency asynchronous optical sampling method without a feedback loop

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