ReSe2 passively Q-switched Nd:Y3Al5 O12 laser with near repetition rate limit of microsecond pulse output

2019 ◽  
Vol 445 ◽  
pp. 165-170 ◽  
Author(s):  
Yuchen Xue ◽  
Li Li ◽  
Bin Zhang ◽  
Ruoxing Wang ◽  
Hao Tian ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Pulse Output ◽  
Rate Limit ◽  
Microsecond Pulse

Acousto-Optic Q-Switched Pulse Fiber Laser with the Peak Power of 9kW

2013 ◽  
Vol 760-762 ◽  
pp. 125-128 ◽  
Author(s):  
Yong Liu ◽  
Lin Lin ◽  
Ji Wang ◽  
Kai Chen ◽  
Guo Zheng Wang ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Repetition Rate ◽  
Pulse Width ◽  
Peak Power ◽  
Average Power ◽  
Repetition Frequency ◽  
Pulse Waveform ◽  
Pulse Output ◽  
The One

An acousto-optic Q-switched pulse fiber laser was presented, and the output power of 20.3W was obtained by using the one-stage Ytterbium-doped double-cladding fiber amplification. The repetition frequency of the pulse fiber laser was tunable in the range of 20-60kHz. We obtained the pulse output with pulse width of 113ns, peak power of 9kW and the average power of 20.3W, when the repetition frequency was 20kHz. We also measured pulse width at different repetition rate and analyzed pulse waveform.

Generalized Heterodyne Configurations for Photo-induced Force Microscopy

2019 ◽  
Author(s):  
Le Wang ◽  
Devon Jakob ◽  
Haomin Wang ◽  
Alexis Apostolos ◽  
Marcos M. Pires ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Repetition Rate ◽  
Modulation Frequency ◽  
High Harmonic ◽  
Chemical Imaging ◽  
Heterodyne Detection ◽  
Force Microscopy ◽  
Wide Range ◽  
The Difference ◽  
Afm Cantilever

<div>Infrared chemical microscopy through mechanical probing of light-matter interactions by atomic force microscopy (AFM) bypasses the diffraction limit. One increasingly popular technique is photo-induced force microscopy (PiFM), which utilizes the mechanical heterodyne signal detection between cantilever mechanical resonant oscillations and the photo induced force from light-matter interaction. So far, photo induced force microscopy has been operated in only one heterodyne configuration. In this article, we generalize heterodyne configurations of photoinduced force microscopy by introducing two new schemes: harmonic heterodyne detection and sequential heterodyne detection. In harmonic heterodyne detection, the laser repetition rate matches integer fractions of the difference between the two mechanical resonant modes of the AFM cantilever. The high harmonic of the beating from the photothermal expansion mixes with the AFM cantilever oscillation to provide PiFM signal. In sequential heterodyne detection, the combination of the repetition rate of laser pulses and polarization modulation frequency matches the difference between two AFM mechanical modes, leading to detectable PiFM signals. These two generalized heterodyne configurations for photo induced force microscopy deliver new avenues for chemical imaging and broadband spectroscopy at ~10 nm spatial resolution. They are suitable for a wide range of heterogeneous materials across various disciplines: from structured polymer film, polaritonic boron nitride materials, to isolated bacterial peptidoglycan cell walls. The generalized heterodyne configurations introduce flexibility for the implementation of PiFM and related tapping mode AFM-IR, and provide possibilities for additional modulation channel in PiFM for targeted signal extraction with nanoscale spatial resolution.</div>

Reducing Repetition Rate: Unbiased Delay Sampling in Online Social Networks

2018 ◽  
Vol 10 (4) ◽  
pp. 308-314 ◽  
Author(s):  
Bingxian Chen ◽  
Lianggui Liu ◽  
Huiling Jia ◽  
Yu Zhang
Keyword(s):  
Social Networks ◽  
Online Social Networks ◽  
Repetition Rate
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