The geometry mismatch between active and passive fibers and particularly the presence of a pedestal around the core of active fibers creates a light coupling from this pedestal to the cladding of the passive fiber when spliced together. This signal light propagating in the cladding can results in a beam degradation that reduces the laser performances. We proposed a new solution consisting in using a perfectly matched couple of fibers by adding a pedestal around the core of the passive fiber. This pedestal maintains the coupling light in a quasi-single-mode pedestal area that will not lead to any power losses and not degrade the output beam.
In this conference, we show the realization of a high power 2.12 μm Ho3+-doped fiber (HDF) laser integrating for the first time to our knowledge a 1.94 μm triple clad fiber (3CF) combiner. This 3CF combiner, specifically developed for the above mentioned HDF laser, presents low losses properties thanks to a low-index glass capillary implemented in the component. Moreover, in this contribution we will discuss the power scalability of such a HDF laser monolithic architecture based on a triple clad fiber combiner pumped at 1.94 μm using Tm3+-doped fiber lasers.
In this contribution, we show for the first time to our knowledge the realization of a high power 1.94 µm triple clad fiber combiner with low insertion losses, thanks to the implementation in the component of a low-index glass capillary. Moreover, in this contribution we discuss the power scalability of a 2.1 µm Ho3+-doped fiber laser architecture integrating the above mentioned triple clad fiber combiner and pumped at 1.94 µm using Tm3+-doped fiber lasers developed at ISL.
Thanks to a high atmospheric transmission, 2 μm fiber lasers offer unique benefits for both civil and military applications, such as LIDAR, laser weapons or optical countermeasures. All-fibered sources are of particular interest since they allow compact, robust and alignment-free systems. Furthermore, they are well-suitable for power upscaling thanks to a good thermal dissipation. We present in this contribution the recent results achieved on 2 μm fiber lasers and fibered components allowing all-fibered architectures. In particular, the power upscaling up to 500 W-class and the efficiency of Tm3+ -doped and Tm3+, Ho3+ -codoped fiber lasers are discussed.
A bidirectional 793 nm diode-pumped actively Q-switched Tm3+, Ho3+-codoped silica polarization maintaining (PM) double-clad (DC) fiber laser is reported. An average output power of 55 W with 100 ns pulse width, 200 kHz repetition rate and 2.09 μm wavelength is obtained with this fiber laser. To the best of our knowledge, this is the highest ever demonstrated average output power emitted from a Q-switched single oscillator 2 μm fiber laser. Thanks to end-caps fusion-spliced on both fiber tips, this fiber laser source is presenting good beam quality factors (M² < 1.7) and no thermal-induced damaging is observed at 55 W average output power. Further power scaling of the laser is only pumppower- limited in the range of the total available pump power in this setup (180 W). Direct OPO ZnGeP2 (ZGP) pumping with this fiber laser has been performed for optical nonlinear conversion in the mid-IR regime. More than 8 W of average output power has been generated in the 3-5 μm band.
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