scholarly journals Ultraviolet Laser Pulses with Multigigahertz Repetition Rate and Multiwatt Average Power for Fast Trapped-Ion Entanglement Operations

2021 ◽  
Vol 15 (2) ◽  
Author(s):  
M.I. Hussain ◽  
D. Heinrich ◽  
M. Guevara-Bertsch ◽  
E. Torrontegui ◽  
J.J. García-Ripoll ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Average Power ◽  
Laser Pulses ◽  
Ultraviolet Laser ◽  
Trapped Ion

scholarly journals The Influence of the Processing Parameters on the Laser-Ablation of Stainless Steel and Brass during the Engraving by Nanosecond Fiber Laser

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 232
Author(s):  
Luka Hribar ◽  
Peter Gregorčič ◽  
Matej Senegačnik ◽  
Matija Jezeršek
Keyword(s):  
Surface Roughness ◽  
Fiber Laser ◽  
Pulse Duration ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Removal Rate ◽  
Average Power ◽  
Laser Pulses ◽  
Processing Parameters ◽  
Pulse Repetition

In this paper, we investigate the influence of the following parameters: pulse duration, pulse repetition rate, line-to-line and pulse-to-pulse overlaps, and scanning strategy on the ablation of AISI 316L steel and CuZn37 brass with a nanosecond, 1064-nm, Yb fiber laser. The results show that the material removal rate (MRR) increases monotonically with pulse duration up to the characteristic repetition rate (f0) where pulse energy and average power are maximal. The maximum MRR is reached at a repetition rate that is equal or slightly higher as f0. The exact value depends on the correlation between the fluence of the laser pulses and the pulse repetition rate, as well as on the material properties of the sample. The results show that shielding of the laser beam by plasma and ejected material plays an important role in reducing the MRR. The surface roughness is mainly influenced by the line-to-line and the pulse-to-pulse overlaps, where larger overlap leads to lower roughness. Process optimization indicates that while operating with laser processing parameters resulting in the highest MRR, the best ratio between the MRR and surface roughness appears at ~50% overlap of the laser pulses, regardless of the material being processed.

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.

Single LD Pumped Nd: YAG Intra-Cavity Frequency Doubling Blue Pulse Lasers

2012 ◽  
Vol 529 ◽  
pp. 159-163
Author(s):  
Q. Dai ◽  
Y. Geng ◽  
Y.J. Liu ◽  
Y.Q. Li
Keyword(s):  
Repetition Rate ◽  
Average Power ◽  
Frequency Doubling ◽  
Laser Cavity ◽  
Laser Pulses ◽  
Blue Laser ◽  
Laser Output ◽  
Level System ◽  
High Repetition ◽  
Side Pumping

To design and achieve a 473nm Q-switched blue laser, with single LD side-pumping structure, this dissertation firstly made 946nm operation of quasi-three-level system possible. After inserting the frequency doubling crystal-LBO and the passively Q-switched crystal-Cr: YAG into the laser cavity, the 473nm blue laser output was obtained at high repetition. When pumped currency reaches 4A, laser pulses of 25ns are generated with average power of 0.11w, repetition rate of 8.3 KHz which satisfies many applications’ requirements.

scholarly journals Sub-4 fs laser pulses at high average power and high repetition rate from an all-solid-state setup

2018 ◽  
Vol 26 (7) ◽  
pp. 8941 ◽  
Author(s):  
Chih-Hsuan Lu ◽  
Tobias Witting ◽  
Anton Husakou ◽  
Marc J.J. Vrakking ◽  
A. H. Kung ◽  
...  
Keyword(s):  
Solid State ◽  
Repetition Rate ◽  
Average Power ◽  
Laser Pulses ◽  
High Repetition Rate ◽  
High Average Power ◽  
High Repetition ◽  
Fs Laser

scholarly journals An Eye-Safe, SBS-Free Coherent Fiber Laser LIDAR Transmitter with Millijoule Energy and High Average Power

Photonics ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 15
Author(s):  
Mehmetcan Akbulut ◽  
Leonid Kotov ◽  
Kort Wiersma ◽  
Jie Zong ◽  
Maohe Li ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Repetition Rate ◽  
Peak Power ◽  
Figure Of Merit ◽  
Current System ◽  
Glass Fibers ◽  
Average Power ◽  
High Gain ◽  
Short Length ◽  
High Average Power

We report on an eye-safe, transform-limited, millijoule energy, and high average power fiber laser. The high gain and short length of the NP phosphate-glass fibers enable the SBS-free operation with kW level peak power. The output energy is up to 1.3 mJ, and the average power is up to 23 W at an 18 kHz repetition rate with 600 ns pulses (peak power > 2.1 kW). The PER is ≈16 dB and the M2 of the beam is 1.33 × 1.18. The coherent LIDAR Figure Of Merit (FOM) is 174 mJ*sqrt(Hz), which to our knowledge is the highest reported for a fiber laser. We also report 0.75 mJ energy and >3.7 kW peak power with down to 200 ns pulses and up to 1.21 mJ energy with a 3–5 kHz repetition rate operation of the current system.

Asynchronous cross-correlation for weak ultrafast deep ultraviolet laser pulses

2009 ◽  
Vol 97 (4) ◽  
pp. 759-763 ◽  
Author(s):  
E. Granados ◽  
A. Fuerbach ◽  
D. W. Coutts ◽  
D. J. Spence
Keyword(s):  
Cross Correlation ◽  
Laser Pulses ◽  
Ultraviolet Laser ◽  
Deep Ultraviolet
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