Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB

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High-pulse-energy actively Q-switched polarization-maintaining Tm3+-doped silica fiber laser

2020 , Schneider, Julian , Forster, Patrick , Eichhorn, Marc , Kieleck, Christelle

A diode-pumped Q-switched thulium-doped fiber laser is reported providing 43 ns short pulses with pulse energies of 800 µJ at a wavelength of 2050 nm.

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High-pulse-energy Q-switched Ho3+:YAG laser

2020 , Büker, H. , Braesicke, P. , Kieleck, Christelle , Eichhorn, Marc

We report on a high-energy Ho3+:YAG laser with a maximum average power of 20.1W at a central wavelength of 2.09µm and M2 < 1.5. In Q-switched operation a maximum pulse energy of 15mJ at 700Hz repetition rate was achieved.

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55 W actively Q-switched single oscillator Tm3+, Ho3+-codoped silica polarization maintaining 2.09 µm fiber laser

2019 , Dalloz, Nicolas , Robin, Thierry , Cadier, Benoît , Kieleck, Christelle , Eichhorn, Marc , Hildenbrand-Dhollande, Anne

A bidirectional 793 nm diode-pumped actively Q-switched Tm3+, Ho3+-codoped silica polarization-maintaining (PM) double-clad (DC) fiber laser is reported. With this fiber laser, 55 W of average output power with 100 ns pulse width at 200 kHz repetition rate and 2.09 µm wavelength is obtained. The pump power injection with end-caps fusion-spliced on fiber tips provides good power stability (< 1.1%) and beam quality factors (M2 < 1.7). The fiber laser output beam polarization factor is 97.5%. At 55 W, no thermal-induced damage is observed on any optical element, and power scaling of the laser is only pump-power-limited in the range of the total available pump power (180 W).

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