A diode-pumped passively Q-switched Nd:Lu0.33Y0.37Gd0.3VO4 (Nd:LuYGdVO4) laser at 1.06 μm with a single-walled carbon nanotube saturable absorber is demonstrated. At the incident pump power 9.1 W, minimum pulse width of 52 ns and maximum peak 66.5 W can be obtained. In order to compare different gain media, Nd:LuVO4 Nd:Lu0.15Y0.85VO4 (Nd:LuYVO4) lasers under same cavity are also investigated. The experimental results show that Nd:LuYGdVO4 crystal more suitable for than or Nd:LuYVO4 crystals.

A diode-pumped dual-loss-modulated Q-switched and mode-locked (QML) Nd:GdVO4 laser with acousto-optic (AO) modulator Cr4+:YAG saturable absorber is presented. The experimental results show that the QML has nearly 100% modulation depth deeper than 85% of passively pulse. Q-switch pulse energy are measured higher only Cr4+:YAG. stability dual-loss-modulation significantly improved if compared to

A diode-pumped doubly passively Q-switched Nd:LuVO4 laser with Cr4+:YAG saturable absorber and GaAs output coupler is realized. This can generate a shorter more symmetric pulse profile when compared pure GaAs. By using two absorbers different small-signal transmissions T0 = 0.71 0.81, the maximum average power are 1.15 W 1.31 at incident pump of 11.23 W, corresponding to optical conversion efficiencies 10.2% 11.7%. At same power, minimum widths 4.18 ns 5.42 be obtained respectively. The...

We present a compact passively Q-switched mode-locked Nd:LuVO4 laser run in Z-type folded cavity with semiconductor saturable absorber mirror (SESAM). The repetition rates of the pulse envelope ranges from 22.99 to 141.18 kHz as pump power increased 2.372 8.960 W. pulses has 111 MHz determined by length and duration is evaluated be 257 ps. An average output 823.5 mW achieved at 8.96 W, corresponding an optical conversion efficiency 9.2%.

A diode-pumped passively Q-switched Nd:Lu0.15Y0.85VO4 laser with a GaAs output coupler is demonstrated. By using mixed crystal as medium, the can generate shorter pulse width higher peak power in comparison Nd:LuVO4 or Nd:YVO4 lasers under same cavity. At incident pump 11.9 W, minimum of 3.23 ns and maximum 1.67 kW be obtained. The average repetition rate are also measured. experimental results show that promising medium for power.

Simultaneous mode locking had been obtained in acousto-optic Q-switched Nd:LuVO4 laser by using a Z-type cavity. Pulses with great average output power and narrow pulse width were observed our experiment. The modulation depth is nearly 90% the of envelope about 70 ns, both maintained constant increase pump power. maximum 1.83 W was when incident 6.78 envelop repetition frequency 30 kHz. Also among estimated to be 200 ps.

Diode pumped continuous wave operation and passively Q-switched performances of a Nd:Sc2SiO5 laser crystal at 1.08 microns have been demonstrated. A maximum average output power up to 1.86 W has obtained, corresponding an optical conversion efficiency 20.7% slope 30.4% with respect the absorbed pump power. With Cr4+:YAG wafer used as saturable absorber, generated pulse short 22.5 ns repetition rate 20 kHz. The energy 44.8 μJ was achieved, peak 1.66 kW.

By using a piece of single-walled carbon nanotube saturable absorber, the performance passively Q-switched composite Nd:YVO4 laser has been demonstrated for first time. The maximum average output power and shortest pulse width are 1220 mW 103 ns at incident pump 5.04 W 10% transmission coupler. highest repetition rate 415.6 kHz largest single-pulse energy 2.94 μJ also obtained. crystal more excellent than normal 1064 nm.

The laser performance of a composite crystal bonded with three Nd:YVO4 single crystals has been investigated for the first time as far we know. largest continuous wave output power 2.68 W is obtained at incident pump 6.2 W, giving an optical conversion efficiency 43.1% and slope 45.9%. For passively Q-switched operation Cr4+:YAG 71% initial transmission, shortest pulse width 18.2 ns, single-pulse energy 19.9 μJ, highest peak 1.12 kW are achieved, repetition rate being 44.9 kHz, W. can...

Periodic nano-ripples structures were fabricated by femtosecond laser scanning on WC/Co based TiAlN coatings. The surface morphology, ripples dimension and changes in the element content of samples irradiated with different processing parameters analysed. results show that formation quality are largely determined pulse energy, speed spacings. 3 μJ 500 μm s −1 5 spacing induce best films among all experimental conditions. period formed gradually increases increasing spacing, which is smaller...

We have realized, for the first time to our knowledge, passive Q-switching operation of an LD-pumped Nd:GdVO4 laser at 1342 nm with V:YAG saturable absorber initial transmission as high 96%. This is investigated under different transmissions output coupler. The dependences average power, pulse width, repetition rate, single-pulse energy and peak power on incident pump are also measured. shortest width 80 ns, maximum 19.5 μJ highest 244 W obtained coupler T = 15% 7.93 W. find a special...

A diode-pumped dual-loss-modulated Q-switched and mode-locked (QML) Nd:Lu0.15Y0.85VO4 laser with acousto-optic (AO) modulator Cr4+:YAG saturable absorber is presented. The stable QML pulse high peak power complete modulation depth has been obtained. characteristics such as the width, single-pulse energy etc. have measured for different small-signal transmissions (T 0) of Cr4+:YAG, reflectivity (R) output coupler frequencies AO (f p ). results show that increases decreasing f increasing T 0,...

By using a-cut Nd:Lu0.15Y0.85VO4 mixed crystal as laser gain medium, a diode-pumped passively Q-switched and mode-locked (QML) with GaAs saturable absorber in Z-type folded cavity is demonstrated for the first time. The pulses about 90% modulation depth are obtained long pump power reached oscillation threshold. repetition rate of pulse envelope ranges from 50 to 186 kHz increases 0.915 6.520 W. Under an incident 6.52 W, QML largest average output 694 mW, shortest width 200 ns highest energy...

A diode-pumped Q-switched and mode-locked (QML) Nd:LuVO4/KTP green laser with acousto-optic modulator (AOM) Cr4+:YAG saturable absorber is presented. By inserting an AOM into the cavity, stability of QML pulse AO improved, modulation depth increased width envelope significantly compressed in comparison that singly passively Cr4+:YAG. The experimental results show peak power doubly much higher than pulse.

An xenon-lamp-pumped passively Q-switched and mode-locked (QML) Nd:YAG laser with Co:LMA saturable absorber at 1.3 μm is realized in a straight cavity. The modulation depth of mode locking pulse has reached 100%. energy the width QML have been measured. mode-locking estamated to be 940 ps.

Performance comparisons of laser-diode pumped passively Q-switched intracavity-frequency-doubled Nd:Gd0.19Y0.81VO4 and Nd:Gd0.83Y0.17VO4 lasers at 671 nm are demonstrated for the first time to our knowledge. KTP crystal is used as frequency doubling material V:YAG saturable absorber with initial transmission 89%. The dependences average output power, pulse width, repetition rate, single-pulse energy peak power on incident pump measured contrasted. experimental results show that, laser has...

When the brushless doubly-fed induction generator (BDFIG) connects to power grid, reactive capacity of BDFIG is an essential issue, especially when grid voltage drops. In this paper, active and are derived, region based on winding current voltage, control rotor speed analyzed, absorbing constrained by stator current, while output dominated CW current. Furthermore, gird-connected method developed, expected achieved. The simulation results verify correctness tracking performance BDFIG.

ABSTRACT The fracture behaviour of Fe 78 Si 9 B 13 metallic glass under laser shock loading was investigated. Morphologies the surface and irradiated were characterized using scanning electron microscope. results show that consists sliding region final with crack propagation. Liquid droplets melted belts are scattered on as notable features compared morphology quasistatic loading, indicating significant temperature increase in shear bands during dynamic loading. primary secondary distributed...

By using double-mixed crystal Nd:Lu0.15Y0.85VO4 as laser medium, a diode-pumped doubly Q-switched and mode-locked (QML) with acousto-optic (AO) modulator central semiconductor saturable absorption mirror (SESAM) is realized for the first time. The envelope modulation depth nearly 100%.The average output power pulse width of etc. different AO repetition rates have been measured. experimental result show that an excellent medium QML lasers.

The conventional simplification of a photovoltaic (PV) station as one-off trip, in case its failure low voltage ride through (LVRT) is often inadequate for analyzing cascading failures modern power systems with non-unique timescales. To address this issue, paper proposes an efficient methodology to study the local dynamics PV under LVRT. Firstly, analytical voltage-distribution model and event-timing algorithm are presented. iterative use straightforwardly describes sequential associated...