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Wyświetlanie 1-3 z 3
Tytuł:
Picosecond mode-locked tm-doped fibre laser and amplifier system providing over 20 W of average output power at 1994 nm
Autorzy:
Grześ, P.
Michalska, M.
Świderski, J.
Powiązania:
https://bibliotekanauki.pl/articles/220559.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pulsed fibre lasers and amplifiers
mid-infrared
mode-locked lasers
thulium-doped fibres
Opis:
A mode-locked Tm3+-doped fibre laser and amplifier operating at a central wavelength of 1994.3 nm is demonstrated. A thulium oscillator is passively mode-locked by a semiconductor saturable absorber mirror to generate an average power of 17 mW at a fundamental repetition rate of 81 MHz in a short linear cavity. This 2-μm laser train is amplified to an average power to 20.26 W by two double-clad thulium-doped all-fibre amplifiers. The pulse energy, duration and peak power is 250 nJ, 23 ps and 9.57 kW, respectively. This represents one of the highest values of average power at ~2-μm-wavelength for picosecond thulium-doped fibre lasers and amplifiers. The performance of the laser system is described in details.
Źródło:
Metrology and Measurement Systems; 2018, 25, 4; 649-658
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GaAs/AlGaAs (~9.4 žm) quantum cascade lasers operating at 260 K
Autorzy:
Bugajski, M.
Kosiel, K.
Szerling, A.
Kubacka-Traczyk, J.
Sankowska, I.
Karbownik, P.
Trajnerowicz, A.
Pruszy, E.
Pierciński, K.
Pierścińska, D.
Powiązania:
https://bibliotekanauki.pl/articles/200656.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quantum cascade lasers
pulsed mode
Opis:
The fabrication of Quantum Cascade Lasers (QCLs) emitting at 9.4 um is reported. The devices operated in pulsed mode at up to 260 K. The peak powers recorded in 77 K were over 1 W, and the slope efficiency 0.5–0.6 W/A per uncoated facet. This has been achieved by the use of GaAs/Al0.45Ga0.55As heterostructure, with 3QW anticrossed-diagonal design originally proposed by Page et al. [1]. Double plasmon planar confinement with Al-free waveguide has been used to minimize absorption losses. The double trench lasers were fabricated using standard processing technology, i.e., wet etching and Si3N4 for electrical insulation. The QCL structures have been grown by Molecular Beam Epitaxy (MBE), with Riber Compact 21T reactor. The stringent requirements – placed particularly on the epitaxial technology – and the influence of technological conditions on the device structure properties are presented and discussed in depth.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 4; 471-476
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compact nanosecond pulse generator based on IGBT and spark gap cooperation
Autorzy:
Achour, Y.
Starzyński, J.
Łasica, A.
Powiązania:
https://bibliotekanauki.pl/articles/202157.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pulsed power
nanosecond generator
Isolated Gate Bipolar Transistor (IGBT)
spark gap
avalanche mode Bipolar Junction Transistor
Opis:
The present paper describes a new architecture of a high-voltage solid-state pulse generator. This generator combines the two types of energy storage systems: inductive and capacitive, and consequently operates two types of switches: opening and closing. For the opening switch, an isolated gate bipolar transistor (IGBT) was chosen due to its interesting characteristics in terms of controllability and robustness. For the closing switch, two solutions were tested: spark-gap (SG) for a powerful low-cost solution and avalanche mode bipolar junction transistor (BJT) for a fully semiconductor structure. The new architecture has several advantages: simple structure and driving system, high and stable controllable repetition rate that can reach 1 kHz, short rising time of a few nanoseconds, high gain and efficiency, and low cost. The paper starts with the mathematical analysis of the generator operation followed by numerical simulation of the device. Finally add a comma the results were confirmed by the experimental test with a prototype generator. Additionally, a comparative study was carried out for the classical SG versus the avalanche mode BJT working as a closing switch.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 377-388
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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