Intracavity polarization control in mode-locked Er-doped fibre lasers using liquid crystals

AbstractIn this paper we present a novel configuration of an NPR mode-locked Er-doped laser. This new optical setup uses voltage controlled LC cells to replace standard retarders (quarter-and half-waveplates) inside the laser cavity. Using this novel, mechanical-adjustment-free setup a mode-locking was obtained with sub-500 fs pulse duration and an average power exceeding 40 mW. Presented results show that using simple LC cells, an optical layout of an NPR mode-locked laser can be greatly simplified.

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Distributed Kerr Lens Mode-Locked Yb:YAG Thin-Disk Oscillator

Ultrafast Science ◽

10.34133/2022/9837892 ◽

2022 ◽

Vol 2022 ◽

pp. 1-8

Author(s):

Jinwei Zhang ◽

Markus Pӧtzlberger ◽

Qing Wang ◽

Jonathan Brons ◽

Marcus Seidel ◽

...

Keyword(s):

High Power ◽

Average Power ◽

Ultrashort Pulses ◽

Laser Cavity ◽

Mode Locking ◽

Gain Medium ◽

Thin Disk ◽

Narrow Bandwidth ◽

Cavity Modes ◽

High Power Output

Ultrafast laser oscillators are indispensable tools for diverse applications in scientific research and industry. When the phases of the longitudinal laser cavity modes are locked, pulses as short as a few femtoseconds can be generated. As most high-power oscillators are based on narrow-bandwidth materials, the achievable duration for high-power output is usually limited. Here, we present a distributed Kerr lens mode-locked Yb:YAG thin-disk oscillator which generates sub-50 fs pulses with spectral widths far broader than the emission bandwidth of the gain medium at full width at half maximum. Simulations were also carried out, indicating good qualitative agreement with the experimental results. Our proof-of-concept study shows that this new mode-locking technique is pulse energy and average power scalable and applicable to other types of gain media, which may lead to new records in the generation of ultrashort pulses.

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Sub-40-fs high-power Yb:CALYO laser pumped by single-mode fiber laser

High Power Laser Science and Engineering ◽

10.1017/hpl.2019.49 ◽

2019 ◽

Vol 7 ◽

Author(s):

Wenlong Tian ◽

Geyang Wang ◽

Dacheng Zhang ◽

Jiangfeng Zhu ◽

Zhaohua Wang ◽

...

Keyword(s):

Solid State ◽

Fiber Laser ◽

Pulse Duration ◽

Saturable Absorber ◽

High Power ◽

Average Power ◽

Single Mode ◽

Mode Locking ◽

Single Mode Fiber ◽

Passive Mode

We report on the study of single-mode fiber-laser-pumped mode-locked Yb:CALYO lasers via using a passive saturable absorber and Kerr-lens mode-locking technique, respectively. Up to 3.1-W average power with 103-fs pulse duration is obtained from the passive mode-locking, and down to 36-fs pulse duration with more than 2-W average power is achieved by the pure Kerr-lens mode-locking, which is to the best of our knowledge, the highest average power from a reported sub-40-fs Yb-based solid-state oscillator.

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Numerical model of hybrid mode-locked Tm-doped all-fibre laser

Scientific Reports ◽

10.1038/s41598-020-74194-7 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Aleksandr Donodin ◽

Vasilii Voropaev ◽

Daniil Batov ◽

Dmitrii Vlasov ◽

Vladimir Lazarev ◽

...

Keyword(s):

Numerical Model ◽

Average Power ◽

Spectral Width ◽

Mode Locking ◽

Experimental Results ◽

Fibre Laser ◽

Model Parameters ◽

Hybrid Mode ◽

Fibre Lasers ◽

Laser Systems

Abstract Ultrafast Tm-doped fibre lasers have been actively studied for the last decade due to their potential applications in precise mid-IR spectroscopy, LIDARs, material processing and more. The majority of research papers is devoted to the comparison between a numerical modelling and experimental results; however, little attention is being paid to the comprehensive description of the mathematical models and parameters of the active and passive components forming cavities of Tm-doped all-fibre lasers. Thus, here we report a numerical model of a stretched-pulsed Tm-doped fibre laser with hybrid mode-locking and compare it with experimental results. The key feature of the developed numerical model is employment of the experimentally measured dispersion coefficients and optimisation of some model parameters, such as the bandwidth of the spectral filter spectral filtering and the saturation power of the active fibre, for a conformity with the experiment. The developed laser emits 331.7 fs pulses with a 23.8 MHz repetition rate, 6 mW of average power, 0.25 nJ of pulse energy, and a 21.66 nm spectral bandwidth at a peak wavelength of 1899.5 nm. The numerical model characteristics coincide with experimentally achieved spectral width, pulse duration, and average power with inaccuracy of 4.7%, 5.4%, and 22.9%, respectively. Moreover, in the discussion of the work the main possible reasons influencing this inaccuracy are highlighted. Elimination of those factors might allow to increase accuracy even more. We show that numerical model has a good agreement with the experiment and can be used for development of ultrafast Tm-doped fibre laser systems.

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Stable continuous-wave mode-locked laser from a 1645 nm Er:YAG ceramic oscillator

Applied Physics Express ◽

10.35848/1882-0786/ac481c ◽

2022 ◽

Author(s):

Yangyu Liu ◽

Xue Cao ◽

AnHua Xian ◽

Guangmiao Liu ◽

Wei zhou ◽

...

Keyword(s):

Solid State ◽

Pulse Width ◽

Peak Power ◽

Continuous Wave ◽

Modulation Depth ◽

Average Power ◽

Mode Locking ◽

Wave Mode ◽

Semiconductor Saturable Absorber ◽

Continuous Wave Mode

Abstract We demonstrate stable continuous-wave mode-locking (CWML) pulses around 1645nm by employing the home-made Er:YAG ceramic. By using a fiber laser and semiconductor saturable absorber mirror (SESAM) with modulation depth of 1.2%, we get ML pulses with the output average power up to 815 mW, the pulse width shortened as ~4 ps, and the peak power of 1.8 kW. With the SESAM of modulation depth of 2.4%, the second-order harmonic ML pulses were also obtained. As far as we know, this is the first report of CWML from Er3+-doped ceramics and also the shortest pulse duration in Er3+-doped solid-state oscillators.

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High peak power, high-energy, high-average power pulsed fibre laser system with versatile pulse duration and shape

2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC ◽

10.1109/cleoe-iqec.2013.6801333 ◽

2013 ◽

Author(s):

A. Malinowski ◽

P. Gorman ◽

C.A. Codemard ◽

F. Ghiringhelli ◽

A. J. Boyland ◽

...

Keyword(s):

Pulse Duration ◽

Peak Power ◽

Laser System ◽

Average Power ◽

High Energy ◽

High Peak ◽

Fibre Laser ◽

High Peak Power ◽

High Average Power

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Comparison on exfoliated graphene nano-sheets and triturated graphite nano-particles for mode-locking the Erbium-doped fibre lasers

Laser Physics ◽

10.1088/1555-6611/aabd1b ◽

2018 ◽

Vol 28 (6) ◽

pp. 065102

Author(s):

Chun-Yu Yang ◽

Yung-Hsiang Lin ◽

Chung-Lun Wu ◽

Chih-Hsien Cheng ◽

Din-Ping Tsai ◽

...

Keyword(s):

Mode Locking ◽

Nano Particles ◽

Fibre Lasers ◽

Exfoliated Graphene ◽

Erbium Doped

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Passively mode-locked in Er-doped fiber laser based on semi-metallic InBi saturable absorber

Journal of Physics D Applied Physics ◽

10.1088/1361-6463/ac378e ◽

2021 ◽

Author(s):

Jianwei Hu ◽

Rong Huang ◽

Ziqiao Wei ◽

Minru Wen ◽

Fugen Wu ◽

...

Keyword(s):

Fiber Laser ◽

Modulation Depth ◽

Mode Locking ◽

Nodal Line ◽

Saturable Absorption ◽

Optical Nonlinearities ◽

Passive Mode ◽

Central Wavelength ◽

Two Dimensional Materials ◽

Er Doped

Abstract Two-dimensional materials have drawn great interest for their applications in mode-locking owning to their unique optical nonlinearities. However, most of these 2D materials are semi-conductor. In this study, a new kind of semimetal Indium bismuth (InBi) is reported which is a topological nodal-line semimetal with exotic physical properties. The InBi nanomaterials was prepared through liquid phase exfoliation method with average thickness of 32.8 nm. The saturable absorption property was measured and passive mode-locking operation was achieved successfully in Er-doped fiber laser. It exhibits a modulation depth of 3.21%, a saturable intensity of 100 MW/cm2, and a pulse width about 859.97 fs corresponding to the central wavelength of 1562.27 nm and 3-dB bandwidth of 2.98 nm. The experimental results open a new avenue for the use of semimetals InBi nanomaterials in lasers and photonics applications.

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