Ms. Brenda M. Donelan Profile

Brenda M. Donelan

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Publications (3)

Proceedings Article | 27 February 2015 Paper

6.5W mid-infrared ZnGeP2 parametric oscillator directly pumped by a Q-switched Tm3+-doped single-oscillator fiber laser

C. Kieleck, A. Berrou, B. Donelan, B. Cadier, Thierry Robin, M. Eichhorn

Proceedings Volume 9347, 93470O (2015) https://doi.org/10.1117/12.2081116

KEYWORDS: Mid-IR, Mirrors, Optical parametric oscillators, Oscillators, Phase modulation, Crystals, Laser beam propagation, Fiber lasers, Q switched lasers, Pulsed laser operation

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Proceedings Article | 20 February 2015 Paper

4.5 W mid-infrared supercontinuum generation in a ZBLAN fiber pumped by a Q-switched mode-locked Tm3+- doped fiber laser

C. Kneis, B. Donelan, A. Berrou, I. Manek-Hönninger, B. Cadier, T. Robin, M. Poulain, F. Joulain, M. Eichhorn, C. Kieleck

Proceedings Volume 9342, 93420B (2015) https://doi.org/10.1117/12.2077215

KEYWORDS: Optical fibers, Mid-IR, Optical filters, Continuous wave operation, Q switching, Mode locking, Fiber lasers, Q switched lasers, Bragg cells, ZBLAN

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Proceedings Article | 7 October 2014 Paper

2 μm and mid-IR fiber-laser-based sources for OCM

C. Kieleck, A. Berrou, C. Kneis, B. Donelan, M. Eichhorn

Proceedings Volume 9251, 92510C (2014) https://doi.org/10.1117/12.2070355

KEYWORDS: Mid-IR, Continuous wave operation, Optical parametric oscillators, Q switching, Mode locking, Fiber lasers, Diodes, Q switched lasers, Bragg cells, Nonlinear crystals

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This paper describes new laser sources and non linear conversion setups for 2 μm and mid-IR generation based on fiber technologies developed at ISL. Especially for jamming heat-seeking missiles, these novel designs allow to propose future compact, efficient and integrable laser systems. The specialty of the ISL technology lies in the use of single 2 μm fiber laser oscillators, which deliver the full output peak power to pump optical parametric oscillators or nonlinear fibers. No multi-stage amplifiers at 2 μm or 1.55 μm are necessary to efficiently pump non linear converters to obtained useful energies in the mid-infrared spectral range. This technology leads to efficient, simple and promising setups to be implemented in flying platforms. The best results achieved in continuous-wave (CW), Q-switched (QS) and mode-locked (ML) regimes with fiber lasers based on Tm³⁺-doped and Tm3+,Ho³⁺-codoped fibers are presented. Up to 70 W of average power was achieved around 2 μm with a Tm³⁺-doped fiber in CW regime. In ML regimes, at a repetition rate of 66 MHz, 50 W of average power was reached. In QS regime, up to 32 W of average power was generated around 2 μm with a polarization maintaining Tm³⁺-doped fiber at a repetition rate of 40 kHz. With a Tm³⁺,Ho³⁺-codoped fiber, up to 25 W of average power was obtained around 2070 nm in Q-switched regime. For example at 50 kHz, the pulse duration was around 50 ns at the maximum output power. The M² was estimated to be less than 1.2. The emission from QS fiber lasers was used to directly pump OP-GaAs and ZGP OPOs. For example, in band II, up to 6.5 W of averaged power was recently obtained from a ZGP OPO pumped by a Tm³⁺-doped fiber laser. At 40 kHz repetition rate, the pulse duration was around 65 ns at the maximum output power. For 3 W of averaged output power, the M² of the signal beam was estimated to be less than 2.1 and less than 2.4 for the idler beam. Using a mode-locked Tm³⁺-doped fiber laser to pump a ZBLAN fiber at an injection efficiency of ~60%, an overall supercontinuum power of up to 2.2 W from a pump power of 5.4 W was achieved. The power above 2650 nm was 0.7 W.

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