June 2025
·
10 Reads
What is this page?
This page lists works of an author who doesn't have a ResearchGate profile or hasn't added the works to their profile yet. It is automatically generated from public (personal) data to further our legitimate goal of comprehensive and accurate scientific recordkeeping. If you are this author and want this page removed, please let us know.
Publications (10)
December 2024
·
19 Reads
Optics & Laser Technology
• LIDT of Yb:YAG crystals with antireflection coatings is as high underwater as in air. • One sample exhibited higher LIDT underwater. • The LIDT reaches the Yb:YAG saturation intensity at room temperature. • Water permeation into the coating may lead to reduced field intensities on defects.
December 2022
·
23 Reads
October 2022
·
92 Reads
The European Physical Journal Conferences
September 2022
Direct laser slab face-cooling by a fluid crossing the main and pump laser beams is an important method to reach high average laser powers. However, the flow regime is usually maintained at low Reynolds numbers, to prevent the onset of turbulence features in the flow, that would degrade wavefront quality. We show here how bringing the fluid temperature to the thermo-optical null point, close to the water/ice transition in the case of water, allows one to mitigate the optical consequences of hydrodynamic instabilities, by bleaching optically the temperature inhomogeneities within the flow. This optical process, dubbed 'index-leveling', opens the door to a highly efficient forced-flow, weakly turbulent face-cooling regime that should be instrumental to boost the kilowatt capabilities of next generation high-power lasers.
May 2022
·
130 Reads
·
2 Citations
Direct laser slab face-cooling by a fluid crossing the main and pump laser beams is an important method to reach high average laser powers. However, the flow regime is usually maintained at low Reynolds numbers to prevent the onset of turbulence features in the flow that would degrade the wavefront quality. We show here how bringing the fluid temperature to the thermo-optical null point, close to the water/ice transition in the case of water, allows one to mitigate the optical consequences of hydrodynamic instabilities, by bleaching optically the temperature inhomogeneities within the flow. This optical process, dubbed index-leveling, opens the door to a highly efficient forced-flow, weakly turbulent face-cooling regime that should be instrumental to boost the kilowatt capabilities of next-generation high-power lasers.
January 2022
·
13 Reads
·
1 Citation
We report the development of a 1 kHz-900-fs Yb:YAG thin-disk regenerative amplifier delivering 50 mJ. We discuss how to address thermal issues in Pockels cell to further increase the output energy up to 100 mJ.
March 2020
·
148 Reads
·
20 Citations
We report on a monolithic narrow spectral linewidth master oscillator power amplifier (MOPA) delivering up to 39 W around 976 nm with very high contrast. The amplifier is based on an ytterbium-doped large mode area (LMA) octagonal double clad (DC) active fiber with parameters optimized for long living three-level operation.
June 2019
·
27 Reads
·
1 Citation
June 2019
·
20 Reads
·
1 Citation
Citations (4)
... To date, Clemens Herkommer et al, utilizing a combination of regenerative amplification and multipass amplification, have achieved a pulse energy of 720 mJ at a 1 kHz repetition frequency, which is the highest pulse energy realized so far with thin disk regenerative amplification technology [11]. However, due to the need for a significantly high initial gain, these high single pulse energy thin disk regenerative amplifiers typically operate near to 1 kHz repetition frequency, with an overall optical-to-optical efficiency of around 10% [12]. Although using 969 nm pump sources with lower quantum defect (zero-phonon line pumping) and pulsed pumping methods has been shown to improve system efficiency, the final optical-to-optical efficiency only reaches around 20% [13,14]. ...
- Citing Conference Paper
January 2022
... The amplifier cell was qualified at different repetition rates from one shot per few minutes to one shot per minute. Emphasis is herein placed on assessment of mid spatial scale [1 mm -10 mm] distortions in amplified wavefronts commonly observed in fluid-cooled amplifiers [25,26]. Such wavefront defects in large-aperture multi-slabs laser systems are likely to degrade the focal point quality and, in the worst case, damage optical materials due to Kerr effects and/or amplitude modulation during laser beam propagation [17,27]. ...
- Citing Article
- Full-text available
May 2022
... Consequently, various methods aimed at mitigating this effect have been put into practice. These include manipulating temperature or stress gradients to alter the Brillouin gain spectrum [2], [3], utilizing fibers with larger effective mode area [4], [5], diminishing the effective length of the optical fiber [6], [7], multi-tone seeds injection [8], [9], and phase modulation [10], [11], [12], [13], [14], [15], [16], [17], [18], [19]. However, existing suppression means such as manipulating temperature or stress gradients for multi-tone seed injection are complex and costly systems difficult to implement. ...
- Citing Article
- Full-text available
March 2020
... functional quantum calculators [4]), the need for single frequency (SF) high-power fiber lasers has been increasing over the last decade. The ability to maintain an excellent modal quality, the wide tuning range in the Ytterbium (Yb) band [5][6][7][8], the linear polarization and the optical low-noise operation is driving this technology as an excellent replacement for more established high-power bulk systems in the 1 µm region. ...
- Citing Conference Paper
June 2019