NDLI: Scalability of mode-locked thin-disk oscillators: Issues and scenarios of destabilization

Content Provider	IEEE Xplore Digital Library
Author	Pronin, O. Kalashnikov, V.L. Pervak, V. Teisset, C. Larionov, M. Rauschenberger, J. Apolonski, A. Fill, E. Krausz, F.
Copyright Year	2011
Description	Author affiliation: Dausinger&Giesen GmbH, Rotebühlstraße 87, D-70178, Stuttgart, Germany (Larionov, M.) \|\| Department of Physics, Ludwig-Maximillians-Universität München, Am Coulombwall 1, D-85748 Garching, Germany (Pronin, O.; Pervak, V.; Teisset, C.; Rauschenberger, J.; Apolonski, A.; Fill, E.; Krausz, F.) \|\| Institut fuer Photonik, TU Wien, Gusshausstrasse 27/387, A-1040 Vienna, Austria (Kalashnikov, V.L.)
Abstract	Recent progress of the high-energy ultrashort pulse oscillators brings many new options for high-field physics experiments [1]. The combination of high pulse energy with high pulse repetition rate is especially an important target. Recently, the pulse energies of up to 26 µJ in multipass geometry [2] and average power of 141W have been achieved directly from a thin disk mode-locked oscillator [3]. There exists a simple rule, which describes the pulse energy scaling in the anomalous dispersion regime: E ∝ β Aeff/n2(β is the net-group delay dispersion (GDD), Aeff is the average mode area in a resonator, n2 is the net-self phase modulation (SPM) coefficient) [4]. This rule suggests three main roads providing the energy scaling: i) GDD scaling, ii) mode area scaling, and iii) SPM suppression (e.g. by resonator purification). In practice, there are some obstacles for such direct scaling: cavity purification substantially complicates a system; GDD growth troubles the mode-locking self-starting ability and increases pulse duration; proportional growth of mode size at a disk and SESAM is hardly realizable due to the stability zone shrinking and not perfect quality of a SESAM, etc. In this work we report, for the first time to our knowledge, a mode-locked Yb:YAG thin-disk oscillator operating at 40 MHz repetition rate with the average power scaling ranging from 57 W to 100 W with roundtrip dispersion of −21000 $fs^{2}.$ The air-filled resonator provides the Gaussian mode of 2.6 mm in diameter at the disk and 1.4–1.8 mm at a SESAM. The typical spectra corresponding to five different power levels are shown in Fig. 1 (left graph). It was found, that very weak satellites follow the pulse closely (few picoseconds). Simultaneously, the power growth changes the SESAM kinetics and its relaxation time increases, fluence is exceeding more than 55 times the 30 $µJ/cm^{2}$ saturation fluence of the SESAM. As a result, the weak cw-component appears behind the pulse (narrow spikes in left graph of Fig. 1). The main destabilization scenario was found to be chaotic-like Q-switch mode-locking with strong multipulsing.
Starting Page	1
Ending Page	1
File Size	252788
Page Count	1
File Format	PDF
ISBN	9781457705335
e-ISBN	9781457705328
DOI	10.1109/CLEOE.2011.5942504
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-05-22
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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