pimiПриборы и методы измеренийDevices and Methods of Measurements2220-95062414-0473BNTU10.21122/2220-9506-2018-9-3-205-214pimi-385Research ArticleСредства измеренийMeasuring instrumentsРегенеративный усилитель чирпированных фемтосекундных импульсов на основе кристалла Yb:CALYO для спектроскопии возбуждения-зондирования с высоким временным разрешениемYb:CALYO-based femtosecond chirped pulse regenerative amplifier for temporally resolved pump-probe spectroscopyРуденковА. С.RudenkovA. S.

Адрес для переписки:  Руденков А.С. – Центр оптических материалов и технологий, Белорусский национальный технический университет, пр-т Независимости, 65, г. Минск 220013, Беларусь       e-mail: a.rudenkov@bntu.by

Address for correspondence: Alexander Rudenkov – Center for Optical Materials and Technologies, Belarusian National Technical University, Nezavisimosty Ave., 65, Minsk 220013, Belarus e-mail: a.rudenkov@bntu.by

a.rudenkov@bntu.byКисельВ. Э.KiselV. E.

Центр оптических материалов и технологий

Center for Optical Materials and Technologies

ЯсюкевичА. С.YasukevichA. S.

Центр оптических материалов и технологий

Center for Optical Materials and Technologies

ОванесьянК. Л.HovhannesyanK. L.ПетросянА. Г.PetrosyanA. G.КулешовН. В.KuleshovN. V.

Центр оптических материалов и технологий

Center for Optical Materials and Technologies

Белорусский национальный технический университетБеларусьBelarusian National Technical UniversityBelarusИнститут физических исследований Национальной академии наук АрменииАрменияInstitute for Physical Research, National Academy of Sciences of ArmeniaArmenia20181709201893205214Copyright © Руденков А.С., Кисель В.Э., Ясюкевич А.С., Ованесьян К.Л., Петросян А.Г., Кулешов Н.В., 20182018Руденков А.С., Кисель В.Э., Ясюкевич А.С., Ованесьян К.Л., Петросян А.Г., Кулешов Н.В.Rudenkov A.S., Kisel V.E., Yasukevich A.S., Hovhannesyan K.L., Petrosyan A.G., Kuleshov N.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://pimi.bntu.by/jour/article/view/385

Регенеративные усилители чирпированных фемтосекундных импульсов на основе материалов с ионами Yb3+ с диодной накачкой нашли широкое применение в различных отраслях науки, производства и медицины. Целью данной работы являлось исследование режима регенеративного усиления широкополосных чирпированных фемтосекундных импульсов в усилителе на основе кристалла Yb3+:CaYAlO . Используя в качестве задающего генератора лазер с пассивной синхронизацией мод, данные системы усиливают импульсы наноджоулевого диапазона энергий до субмилиджоулевого уровня благодаря методике усиления чирпированных импульсов. Большинство описанных в литературе систем усиления используют задающие генераторы, обеспечивающие фемтосекундные импульсы со спектральной полушириной в диапазоне 10–15 нм, что ограничивает минимальную длительность задающих импульсов на уровне 90 фс. В процессе регенеративного усиления длительность усиленных импульсов увеличивается до значений около 200 фс, что связано с сильным негативным влиянием эффекта сужения спектра импульса под воздействием полосы усиления активной среды усилителя. Применение кристаллов, имеющих широкие и гладкие полосы усиления в качестве активных сред систем усиления чирпированных фемтосекундных импульсов широкого спектрального диапазона, позволяет снизить негативный вклад эффекта сужения спектра импульса и приводит к сокращению длительности усиленных импульсов. В работе впервые представлены результаты исследования режима регенеративного усиления широкополосных чирпированных фемтосекундных импульсов в усилителе на основе кристалла Yb3+:CaYAlO . Получены импульсы длительностью 120 фс (спектральная полуширина 19,4 нм) со средней выходной мощностью системы усиления 3 Вт без применения методик компенсации эффекта сужения спектра усиливаемого импульса.

Diode-pumped femtosecond chirped pulse regenerative amplifiers based on Yb3+-materials are of practical importance for wide range of scientific, industrial and biomedical applications. The aim of this work was to study the amplification of broadband chirped femtosecond pulses in regenerative amplifier based on Yb3+:CaYAlO4 crystal.

Such systems use femtosecond mode-locked lasers as seed pulse sources and amplify nJ-seed pulses to sub-mJ energy range. Most chirped pulse regenerative amplifier systems described in the literature use seed lasers with typical pulse spectral width at the level of 10–15 nm full width at half maximum (FWHM) that limit the seed pulse duration of about 90 fs and amplified pulse duration at the level of 200 fs due to strong influence of gain narrowing effect on the amplified pulse parameters. Yb3+-doped crystals with wide and smooth gain bandwidth as an active medium of chirped femtosecond pulse regenerative amplification systems allow to reduce negative contribution of gain narrowing effect and lead to shortening of amplified pulses. In this research we study the chirped pulse regenerative amplification of broad-band femtosecond pulses (60 nm spectral width FWHM) in the Yb3+:CaYAlO -based chirped pulse regenerative amplifier. Substantial reduction of the amplified pulse duration down to 120 fs (19.4 nm spectral width FWHM) with average power of 3 W at 200 kHz pulse repetition frequency was demonstrated without any gain narrowing compensation technique.

The results of experimental investigation of broad-band seeded Yb3+:CaYAlO -based chirped pulse regenerative amplifier are reported for the first time to our knowledge. 120 fs-pulses (19.4 nm FWHM) with average output power of 3 W were demonstrated without any gain narrowing compensation technique. Despite the significant reduction of amplified pulse duration the task of improvement group velocity dispersion balance (including high orders of group velocity dispersion) remains relevant.

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The authors declare that there are no conflicts of interest present.