Abstract
We present a bi-directionally 793-nm diode-pumped Tm3+, Ho3+-codoped silica polarization maintaining double-clad all-fiber laser based on a single-oscillator architecture emitting 195 W at 2.09 µm in continuous wave mode of operation, with a beam quality near the diffraction limit (M2 = 1.08). The power scaling of the laser is only pump-power-limited in the range of the total available pump power (540 W).
Highlights
The atmospheric transmission window around 2 μm is attracting much interest to fiber laser sources emitting at 2 μm for applications such as eye-safe surgery, material processing, or optical countermeasures [1,2,3,4]
We present a monolithic single-oscillator laser source based on a Tm3+, Ho3+codoped silica fiber emitting at 2.09 μm
To the best of our knowledge, this is the highest output power demonstrated from a monolithic single-oscillator fiber laser source based on a Tm3+, Ho3+-codoped silica fiber
Summary
The atmospheric transmission window around 2 μm is attracting much interest to fiber laser sources emitting at 2 μm for applications such as eye-safe surgery, material processing, or optical countermeasures [1,2,3,4]. The high number of amplification stages needed to get a high average output power, and limitations due to MOPA laser physics (amplification stages isolation, ASE filtering, nonlinear effects) lead to relatively high complexity and volume for such laser sources [8]. Thanks to their high robustness, simpler structure and compactness, single-oscillator fiber lasers constitute one of the most promising architectures [9,10,11]. Free-space pumping systems suffer from difficult thermal management and optical alignments whereas a monolithic fiber laser, where all fiber-components are fusion-spliced together, allows to have an alignment-free laser system offering a very stable and compact laser source
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