MOPA with kW average power and multi MW peak power: experimental results, theoretical modeling, and scaling limits

2006 ◽  
Author(s):  
K. Nicklaus ◽  
M. Hoefer ◽  
D. Hoffmann ◽  
J. Luttmann ◽  
R. Wester ◽  
...  
Keyword(s):  
Peak Power ◽  
Average Power ◽  
Theoretical Modeling ◽  
Experimental Results ◽  
Scaling Limits

scholarly journals MULTI-DEGREE SMOOTHER FOR LOW POWER TESTABLE DIGITAL SYSTEM DESIGN USING BS-LFSR AND SCAN-CHAIN ORDERING TECHNIQUES

2014 ◽  
pp. 23-30
Author(s):  
V. SURYANARAYANA ◽  
K. MIRANJI
Keyword(s):  
Peak Power ◽  
Average Power ◽  
Fault Coverage ◽  
Experimental Results ◽  
Application Time ◽  
Test Application Time ◽  
Test Application ◽  
Average Power Consumption ◽  
Scan Chain ◽  
Chain Ordering

Testing of digital VLSI circuits entails many challenges as a consequence of rapid growth of semiconductor manufacturing technology and the unprecedented levels of design complexity and the gigahertz range of operating frequencies. These challenges include keeping the average and peak power dissipation and test application time within acceptable limits. This dissertation proposes techniques to addresses these challenges during test. The first proposed technique, called bit-swapping LFSR (BS-LFSR), uses new observations concerning the output sequence of an LFSR to design a low-transition test-pattern-generator (TPG) for test-per-clock built-in self-test (BIST) to achieve reduction in the overall switching activity in the circuit-under-test (CUT). The obtained results show up to 28% power reduction for the proposed design, and up-to 63% when it is combined with another established technique. The proposed BS-LFSR is then extended for use in test-per-scantest vectors show up to 60%reduction in average power consumption. The BS-LFSR is then extended further to act as a multi-degree smoother for test patterns generated by conventional LFSRs before applying them to the CUT. Experimental results show up to 55% reduction in average power. Another technique that aims to reduce peak power in scan-based BIST is presented. The new technique uses a two-phase scan-chain ordering algorithm to reduce average and peak power in scan and capture cycles. Experimental results show up to 65% and 55% reduction in average and peak power, respectively. Finally, a technique that aims to significantly increase the fault coverage in test-Per scan BIST, while keeping the test-application time short, is proposed. The results obtained show a significant improvement in fault coverage and test application time compared with other techniques.

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.

Divalent Surfactants. Experimental Results and Theoretical Modeling of Surfactant/Water Phase Equilibria

Langmuir ◽  
1994 ◽  
Vol 10 (7) ◽  
pp. 2177-2187 ◽  
Author(s):  
Haakan Hagslaett ◽  
Olle Soederman ◽  
Bengt Joensson
Keyword(s):  
Phase Equilibria ◽  
Theoretical Modeling ◽  
Experimental Results ◽  
Water Phase

Stable continuous-wave mode-locked laser from a 1645 nm Er:YAG ceramic oscillator

2022 ◽  
Author(s):  
Yangyu Liu ◽  
Xue Cao ◽  
AnHua Xian ◽  
Guangmiao Liu ◽  
Wei zhou ◽  
...  
Keyword(s):  
Solid State ◽  
Pulse Width ◽  
Peak Power ◽  
Continuous Wave ◽  
Modulation Depth ◽  
Average Power ◽  
Mode Locking ◽  
Wave Mode ◽  
Semiconductor Saturable Absorber ◽  
Continuous Wave Mode

Abstract We demonstrate stable continuous-wave mode-locking (CWML) pulses around 1645nm by employing the home-made Er:YAG ceramic. By using a fiber laser and semiconductor saturable absorber mirror (SESAM) with modulation depth of 1.2%, we get ML pulses with the output average power up to 815 mW, the pulse width shortened as ~4 ps, and the peak power of 1.8 kW. With the SESAM of modulation depth of 2.4%, the second-order harmonic ML pulses were also obtained. As far as we know, this is the first report of CWML from Er3+-doped ceramics and also the shortest pulse duration in Er3+-doped solid-state oscillators.

A hybrid linear actuator based on screw clamp operation principle: Design and experimental verification

2021 ◽  
pp. 1045389X2110643
Author(s):  
Yunlai Shi ◽  
Haichao Sun ◽  
Dingji Cheng ◽  
Jun Zhang ◽  
Yuyang Lin ◽  
...  
Keyword(s):  
Experimental Verification ◽  
Peak Power ◽  
Piezoelectric Element ◽  
Experimental Results ◽  
Linear Actuator ◽  
Electromagnetic Torque ◽  
Feed Screw ◽  
Piezoelectric Stacks ◽  
Maximum Thrust

This paper presents a hybrid linear actuator using screw clamp operation principle. The actuator mainly consists of a hollow electromagnetic torque motor located between two clamping nuts, two hollow cylindrical shaped piezoelectric stacks symmetrically configured at two ends of the actuator and a feed-screw (also considered as the mover of the actuator) assembled throughout all the parts. The torque motor is symmetrically connected to two clamping nuts via two torsion coupling springs located at either end of the motor spindle. Two piezoelectric stacks can work independently to propel the opposing loads, which effectively take advantage of the anti-compression and non-tensile characteristics of piezoelectric element. The special feature of the actuator is the screw clamp mechanism, the operation of which involves intermittent rotation of two nuts (driven by the torque motor) on a feed-screw to achieve the bi-direction piezoelectric motion accumulation. Furthermore, the application of feed-screw could decrease the actuator’s sensitivity to wear, in order to realize a rigid self-locking and thus ensure the actuator’s holding capacity. A prototype was fabricated and the experimental results show that the no-load speed, maximum thrust, and peak power of the actuator were 20 mm/s, 280 N, and 1.54 W, respectively.

Catchlike-inducing train activation of human muscle during isotonic contractions: burst modulation

1999 ◽  
Vol 87 (5) ◽  
pp. 1758-1767 ◽  
Author(s):  
Samuel C. K. Lee ◽  
Cara N. Becker ◽  
Stuart A. Binder-Macleod
Keyword(s):  
Isometric Contraction ◽  
Peak Power ◽  
Average Power ◽  
Knee Extension ◽  
Human Muscle ◽  
Constant Frequency ◽  
Maximum Voluntary Isometric Contraction ◽  
Before And After ◽  
Isotonic Performance ◽  
Isotonic Contractions

Stimulation trains that exploit the catchlike property [catchlike-inducing trains (CITs)] produce greater forces and rates of rise of force than do constant-frequency trains (CFTs) during isometric contractions and isovelocity movements. This study examined the effect of CITs during isotonic contractions in healthy subjects. Knee extension was electrically elicited against a load of 10% of maximum voluntary isometric contraction. The stimulation intensity was set to produce 20% of maximum voluntary isometric contraction. The muscle was tested before and after fatigue with a 6-pulse CFT and 6-pulse CITs that contained an initial doublet, triplet, or quadruplet. For prefatigue responses, the greatest isotonic performance was produced by CITs with initial doublets. When the muscles were fatigued, triplet CITs were best. CITs produce greater excursion, work, peak power, and average power than do CFTs, because CITs produced more rapid rates of rise of force. Faster rates of rise of force enabled the preload on the muscle to be exceeded earlier during the stimulation train.

scholarly journals Quasi-Parametric Chirped-Pulse Amplification Simultaneously Enables High Peak Power and High Average Power

2019 ◽  
Vol 11 (4) ◽  
pp. 1-12 ◽  
Author(s):  
Zhe Yin ◽  
Jingui Ma ◽  
Jing Wang ◽  
Peng Yuan ◽  
Guoqiang Xie ◽  
...  
Keyword(s):  
Peak Power ◽  
Average Power ◽  
High Peak ◽  
High Peak Power ◽  
High Average Power ◽  
Chirped Pulse ◽  
Pulse Amplification ◽  
Chirped Pulse Amplification

71 W Average Power Sub-MW Peak Power Diffraction-Limited Monolithic Tapered Fiber Amplifier

2019 ◽  
Author(s):  
Konstantin K. Bobkov ◽  
Mikhail E. Likhachev ◽  
Andrey E. Levchenko ◽  
Vladimir V. Velmiskin ◽  
Tatyana A. Kochergina ◽  
...  
Keyword(s):  
Peak Power ◽  
Average Power ◽  
Fiber Amplifier ◽  
Tapered Fiber
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