| 概 要 |
Burst-mode lasers play an important role in controlling the efficiency of lasermatter interactions and are widely known due to their widespread use in femtosecond micromachining. If the pulse periodicity in a burst is tightly controlled and the relative phase slip from pulse to pulse in a burst is locked, such a burst exhibits properties of a frequency comb. However, unlike a conventional femtosecond frequency comb generated by a cw-mode-locked oscillator, much higher intensities in each pulse can be achieved without running into excessive average power.
In this talk, we will discuss several intriguing applications of phase and amplitude controlled amplified femtosecond bursts in optical frequency upand downconversion and timeand frequency-resolved nonlinear spectroscopy. In contrast to extracavity pulse-burst formation techniques based on pulse splitting, the socalled Vernier-Burst method exploits a roundtrip time detuning between a master and a secondary cavity or loop (1), providing ease of phase stabilization and flexibility of individual pulse envelope shaping. Compared to amplification of isolated pulses, chirped-pulse laser and parametric amplification of phase-locked pulse bursts exhibits a range of additional interesting nonlinear-optical phenomena and technical challenges (2, 3). Burst mode amplifiers improve inversion extraction efficiency and are generally more compact than single-pulse amplifiers of the same pulse energy class.
By using intermediate optical frequency conversion, the burst energy can be very efficiently combined into a multibeam pump for large single-pulse OPCPA (4) without the need to build a Joule-class picosecond pump laser. Temporal sequencing of time delays via the Vernier method enables rapid seamless pulse delay switching in the range from fs to µs without any mechanical delay lines or other moving parts, which is of critical importance to pump-probe techniques aimed at resolving dynamics on multiple time scales (5). Phase-controlled Vernier bursts, with their frequency-comb-like behavior, facilitate a new variant of stimulated Raman spectroscopy with a high spectral resolution and the ability to scan SRS spectra without optical frequency tuning between the Raman pump and Stokes fields (6).
References
- V. Stummer, T. Flöry, G. Krizsán, G. Polónyi, E. Kaksis, A. Pugžlys, J. Hebling, J. A. Fülöp, A. Baltuška, Programmable generation of terahertz bursts in chirped-pulse laser amplification. Optica 7, 1758 (2020).
https://doi.org/10.1364/OPTICA.403184
- V. Stummer, T. Flöry, M. Schneller, E. Kaksis, M. Zeiler, A. Pugžlys, A. Baltuška, Spectral peak recovery in parametrically amplified THz-repetition-rate bursts. Optics Express 31, 37040–37049 (2023).
https://doi.org/10.1364/OE.495480
- V. Stummer, T. Flöry, M. Schneller, E. Kaksis, M. Zeiler, A. Pugžlys, A. Baltuška, Frequency-mode-stable regenerative amplification at terahertz burst rates. APL Photonics 9, 036116 (2024).
https://doi.org/10.1063/5.0167721
- R. Jutas, J. Roman, I. Astrauskas, A. Imani, P. Carpeggiani, P. Polynkin, E. Kaksis, T. Floery, J. Kolenda, T. Bartulevičius, K. Michailovas, A. Michailovas, A. Baltuška, A. Pugžlys (2025) Generation of Broadband Multi-mJ LWIR Pulses in Multicolor-Pumped ZGP NOPCPA. In 2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), pp. 1–1.
https://doi.org/10.1109/CLEO/Europe-EQEC65582.2025.11109515
- T. Flöry, V. Stummer, J. Pupeikis, B. Willenberg, A. Nussbaum-Lapping, E. Kaksis, F. V. A. Camargo, M. Barkauskas, C. R. Phillips, U. Keller, G. Cerullo, A. Pugžlys, A. Baltuška, Rapid-Scan Nonlinear Time-Resolved Spectroscopy over Arbitrary Delay Intervals. Ultrafast Science 3, 0027 (2023).
https://doi.org/10.34133/ultrafastscience.0027
- H. Hu, T. Flöry, V. Stummer, A. Pugzlys, M. Zeiler, X. Xie, A. Zheltikov, A. Baltuška, Hyper spectral resolution stimulated Raman spectroscopy with amplified fs pulse bursts. Light: Science & Applications 13, 61 (2024).
https://doi.org/10.1038/s41377-023-01367-0
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