High-power thin-disk lasers emitting beams with axially-symmetric polarizations

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Marwan Abdou Ahmed ◽  
Frieder Beirow ◽  
André Loescher ◽  
Tom Dietrich ◽  
Danish Bashir ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Average Power ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Thin Disk ◽  
Axially Symmetric ◽  
Radial Polarization ◽  
Average Output ◽  
Optical Efficiency ◽  
Circular Grating

Abstract We present the intracavity generation of beams with radial polarization at an average output power of 750 W and an optical efficiency of 43% from a continuous wave thin-disk laser. Circular grating waveguide output couplers (GWOC) were used to select the radial polarization. The sensitivity of the polarizing function of the GWOC with regards to the fabrication tolerances is also analysed in details with a particular emphasis on the effect of the duty cycle and the geometrical profile of the gratings. Furthermore, we present the conversion of femtosecond laser pulses from linear to azimuthal polarization using a nanograting-based polarization converter. Azimuthally polarized beams with an average power of up to 850 W, a pulse duration of 400 fs and a pulse repetition rate of 1 MHz were generated in this way with a conversion efficiency of >90%.

scholarly journals Efficient 1 µm Laser Emission of Czochralski-Grown Nd:LGSB Single Crystal

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2005 ◽  
Author(s):  
Catalina-Alice Brandus ◽  
Stefania Hau ◽  
Alin Broasca ◽  
Madalin Greculeasa ◽  
Flavius-Marian Voicu ◽  
...  
Keyword(s):  
Pump Power ◽  
Output Power ◽  
Laser Emission ◽  
Continuous Wave ◽  
Average Power ◽  
Ultrashort Pulses ◽  
Mode Locking ◽  
Average Output ◽  
Continuous Wave Output Power ◽  
Optical Efficiency

A 5.0-at.% Nd-doped La0.64Gd0.41Sc2.95(BO3)4 (Nd:LGSB) borate laser crystal was successfully grown by the Czochralski method, for the first time to our knowledge. The spectroscopic properties of the grown crystal are discussed and 1 µm laser emission, under end-pumping with a fiber-coupled diode laser at 807 nm, is reported. A c-cut Nd:LGSB medium yielded 1.35 W continuous-wave output power at 0.63 overall optical-to-optical efficiency, with respect to the absorbed pump power, together with the high 0.68 slope efficiency. With an a-cut Nd:LGSB sample, 0.81 W output power at 0.52 optical-to-optical efficiency was obtained. The laser emission performances under quasi-continuous wave pumping are presented as well, for both c-cut and a-cut crystals. Passive Q-switching was investigated with a semiconductor saturable absorber mirror (SESAM). Laser pulses with 2.2 µJ energy and 32.8 ns durations were recorded from a-cut Nd:LGSB. The average output power reached 0.36 W at 1.55 W absorbed pump power. Passive mode-locking with SESAM was achieved in a long Z-type resonator. Ultrashort pulses with 0.19 W average power, 1.63 nJ energy, and 1.43 ps pulse duration, at 118 MHz repetition rate, are demonstrated for the a-cut Nd:LGSB medium.

scholarly journals Passive Q-Switching by Cr4+:YAG Saturable Absorber of Buried Depressed-Cladding Waveguides Obtained in Nd-Doped Media by Femtosecond Laser Beam Writing

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1689 ◽  
Author(s):  
Gabriela (Salamu) ◽  
Nicolaie Pavel
Keyword(s):  
Femtosecond Laser ◽  
Laser Beam ◽  
Repetition Rate ◽  
Peak Power ◽  
Continuous Wave ◽  
Average Power ◽  
Laser Pulses ◽  
Direct Writing ◽  
Optical Efficiency ◽  
Femtosecond Laser Beam

We report on laser performances obtained in Q-switch mode operation from buried depressed-cladding waveguides of circular shape (100 μm diameter) that were inscribed in Nd:YAG and Nd:YVO4 media by direct writing with a femtosecond laser beam. The Q-switch operation was realized with a Cr4+:YAG saturable absorber, aiming to obtain laser pulses of moderate (few μJ) energy at high (tens to hundreds kHz) repetition rate. An average power of 0.52 W at 1.06 μm consisting of a train of pulses of 7.79 μJ energy at 67 kHz repetition rate, was obtained from a waveguide realized in a 4.8 mm long, 1.1-at % Nd:YAG ceramics; the pulse peak power reached 1.95 kW. A similar waveguide that was inscribed in a 3.4 mm long, 1.0-at % Nd:YVO4 crystal yielded laser pulses with 9.4 μJ energy at 83 kHz repetition rate (at 0.77 W average power) and 1.36 kW peak power. The laser performances obtained in continuous-wave operation were discussed for each waveguide used in the experiments. Thus, a continuous-wave output power of 1.45 W was obtained from the circular buried depressed-cladding waveguide inscribed in the 1.1-at %, 4.8 mm long Nd:YAG; the overall optical-to-optical efficiency, with respect to the absorbed pump power, was 0.21. The waveguide inscribed in the 1.0-at %, 3.4 mm long Nd:YVO4 crystal yielded 1.85 W power at 0.26 overall optical efficiency. This work shows the possibility to build compact laser systems with average-to-high peak power pulses based on waveguides realized by a femtosecond (fs) laser beam direct writing technique and that are pumped by a fiber-coupled diode laser.

Continuous-wave seeded mid-IR parametric system pumped by the high-average-power picosecond Yb:YAG thin-disk laser

2015 ◽  
Author(s):  
Ondřej Novák ◽  
Martin Smrž ◽  
Taisuke Miura ◽  
Hana Turčičová ◽  
Akira Endo ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Average Power ◽  
Thin Disk ◽  
High Average Power ◽  
Disk Laser ◽  
Parametric System ◽  
Thin Disk Laser

130 MW peak power femtosecond laser pulses in a Kerr lens mode-locked thin-disk ring oscillator

CLEO: 2014 ◽  
2014 ◽  
Author(s):  
Abdolreza Amani Eilanlou ◽  
Yasuo Nabekawa ◽  
Makoto Kuwata-Gonokami ◽  
Katsumi Midorikawa
Keyword(s):  
Femtosecond Laser ◽  
Peak Power ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Thin Disk ◽  
Ring Oscillator

Filament damage and channel waveguide fabrication in Yb-doped phosphate glass

2020 ◽  
Vol 34 (29) ◽  
pp. 2050325
Author(s):  
Jing Lv ◽  
Kedian Wang ◽  
Guanghua Cheng
Keyword(s):  
Phosphate Glass ◽  
Continuous Wave ◽  
Single Mode ◽  
Laser Pulses ◽  
Optical Microscope ◽  
Femtosecond Laser Pulses ◽  
Circular Aperture ◽  
Optical Pump ◽  
Channel Waveguides ◽  
Waveguide Fabrication

We report on the fabrication of filament damages in Yb-doped phosphate glass by femtosecond laser pulses. The uneven index modification was obtained using a 20× optical microscope objective with 0.4 numerical apertures. The multimode fields of original channel waveguides were investigated and in good agreement with the simulation results, whose structures can be regarded as a kind of beam splitters. Under the optical pump at 976 nm, the end region of the original filament shows continuous wave laser oscillation. The elongated and uniform filaments were fabricated by introducing a circular aperture, so that the guiding performance of tradition-channel single mode was achieved. Both large-mode-area waveguides are expected to find applications in optical communications and high-power lasers and amplifiers.

Thin-disk multipass amplifier for ultrashort laser pulses with kilowatt average output power and mJ pulse energies

2014 ◽  
Author(s):  
Jan-Philipp Negel ◽  
Andreas Voss ◽  
Marwan Abdou Ahmed ◽  
Dominik Bauer ◽  
Dirk Sutter ◽  
...  
Keyword(s):  
Output Power ◽  
Average Output Power ◽  
Laser Pulses ◽  
Thin Disk ◽  
Ultrashort Laser Pulses ◽  
Average Output ◽  
Pulse Energies ◽  
Ultrashort Laser ◽  
Multipass Amplifier

scholarly journals High-power operation of double-pass pumped Nd:YVO4 thin disk laser

2020 ◽  
Vol 8 ◽  
Author(s):  
Wei Wang ◽  
Di Sun ◽  
Xiao Du ◽  
Jie Guo ◽  
Xiaoyan Liang
Keyword(s):  
Continuous Wave ◽  
Maximum Output Power ◽  
Thin Disk ◽  
Maximum Output ◽  
Double Pass ◽  
Optical Efficiency ◽  
Disk Laser ◽  
Thin Disk Laser ◽  
High Power Operation ◽  
Thermal Lens Effect

A simple, compact, double-pass pumped Nd:YVO4 thin disk laser is demonstrated. Its continuous-wave performance with different Nd doping concentrations and thicknesses is investigated experimentally. The maximum output power of 17.7 W is achieved by employing a 0.5 at.% doped sample, corresponding to an optical-to-optical efficiency of 46% with respect to the absorbed pump power. In addition, a numerical analysis and an experimental study of the temperature distribution, and thermal lens effect of the Nd:YVO4 thin disk, are presented considering the influence of the energy transfer upconversion effect and the temperature dependence of the thermal conductivity tensor. The simulated results are in good agreement with the experimental results.

Femtosecond Laser Pulses Operation in Crystal under High-Power Diode Pumping

2015 ◽  
Vol 1101 ◽  
pp. 169-172
Author(s):  
Brij Mohan Kumar Prasad ◽  
Amrit Bawankan
Keyword(s):  
Beam Quality ◽  
Average Power ◽  
Visible Region ◽  
Laser Pulses ◽  
Mode Locking ◽  
Femtosecond Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Semiconductor Saturable Absorber ◽  
Bonding Failure ◽  
Ultrashort Laser

We report on a diode laser which is used to pump directly the crystal with a semiconductor saturable absorber allows passive mode locking for the generation of pulses with an average power along with the broadband light by focusing on ultrashort laser pulses into crystal tungstate. The nonuniformity can lead to the crystal and bonding failure. Also model the thermal and structural properties at the various tempeartures to observe the beam quality. Extends the generated spectrum from the infrared to ultraviolet through the visible region, it consists of discrete spatially separated sidebands.

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