Laser Timing Probe with Frequency Mapping for Locating Signal Maxima

2009 ◽  
Author(s):  
L.S. Koh ◽  
H. Marks ◽  
L.K. Ross ◽  
C.M. Chua ◽  
J.C.H. Phang
Keyword(s):  
Response Time ◽  
Continuous Wave ◽  
Single Point ◽  
Point Measurement ◽  
Cw Laser ◽  
Measurement Capabilities

Abstract A Laser Timing Probe (LTP) system which uses a noninvasive 1.3 µm continuous wave (CW) laser with frequency mapping and single point measurement capabilities is described. The frequency mapping modes facilitate the localization of signal maxima for subsequent single point measurements. Measurements of waveforms with long delays and 50 ps response time from NMOS and PMOS transistors are also shown.

scholarly journals Thin-Film Processing of Polypropylene and Polystyrene Sheets by a Continuous Wave CO2 Laser with the Cu Cooling Base

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1448
Author(s):  
Nobukazu Kameyama ◽  
Hiroki Yoshida ◽  
Hitoshi Fukagawa ◽  
Kotaro Yamada ◽  
Mitsutaka Fukuda
Keyword(s):  
Thin Film ◽  
Co2 Laser ◽  
Continuous Wave ◽  
Cw Laser ◽  
Heat Effects ◽  
Film Processing ◽  
Carbon Dioxide Co2 ◽  
A Minor ◽  
Residual Heat ◽  
Thin Film Processing

Carbon dioxide (CO2) laser is widely used in commercial and industrial fields to process various materials including polymers, most of which have high absorptivity in infrared spectrum. Thin-film processing by the continuous wave (CW) laser is difficult since polymers are deformed and damaged by the residual heat. We developed the new method to make polypropylene (PP) and polystyrene (PS) sheets thin. The sheets are pressed to a Cu base by extracting air between the sheets and the base during laser processing. It realizes to cut the sheets to around 50 µm thick with less heat effects on the backside which are inevitable for thermal processing using the CW laser. It is considered that the boundary between the sheets and the base is in thermal equilibrium and the base prevents the sheets from deforming to support the backside. The method is applicable to practical use since it does not need any complex controls and is easy to install to an existing equipment with a minor change of the stage.

Optical properties of benzene and derivatives by the single beam thermal lens technique

2017 ◽  
Vol 26 (02) ◽  
pp. 1750025 ◽  
Author(s):  
M. K. Biswas ◽  
P. K. Das ◽  
E. Hoque ◽  
S. M. Sharafuddin ◽  
S. K. Das ◽  
...  
Keyword(s):  
Thermal Lens ◽  
Continuous Wave ◽  
Refractive Index Change ◽  
Optical Nonlinearity ◽  
Index Change ◽  
Single Beam ◽  
Cw Laser ◽  
Ion Laser ◽  
Benzene Toluene ◽  
Long Pulse

The present work studies the optical nonlinearity exhibited by the material (for Continuous Wave (CW) laser or long pulse) due to the change in thermal properties of the material on illumination. Thermal lens (TL) technique has been used to measure the refractive index change due to the formation of TL along with other thermo-optic properties of the material in solution. A CW Ar-ion laser has been used as light source and the laser beam was chopped at 25[Formula: see text]Hz frequency to obtain 12[Formula: see text]ms pulse to observe the formation of the TL within the sample. The [Formula: see text] value have been calculated by the TL technique for Benzene, Toluene and Dimethylaniline (DMA) in toluene and Benzene. The [Formula: see text] value is found to be in the order of 10[Formula: see text] to 10[Formula: see text][Formula: see text]cm2[Formula: see text]W[Formula: see text].

scholarly journals Ultrastable Offset-Locking Continuous Wave Laser to a Frequency Comb with a Compound Control Method for Precision Interferometry

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1248
Author(s):  
Ruitao Yang ◽  
Haisu Lv ◽  
Jing Luo ◽  
Pengcheng Hu ◽  
Hongxing Yang ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Control Method ◽  
Frequency Comb ◽  
Frequency Control ◽  
Beat Frequency ◽  
Laser Interferometry ◽  
Optical Frequency ◽  
Interference Signal ◽  
Compound Control ◽  
Cw Laser

A simple and robust analog feedforward and digital feedback compound control system is presented to lock the frequency of a slave continuous wave (CW) laser to an optical frequency comb. The beat frequency between CW laser and the adjacent comb mode was fed to an acousto-optical frequency shifter (AOFS) to compensate the frequency dithering of the CW laser. A digital feedback loop was achieved to expand the operation bandwidth limitation of the AOFS by over an order of magnitude. The signal-to-noise ratio of the interference signal was optimized using a grating-based spectral filtering detection unit. The complete system achieved an ultrastable offset-locking of the slave CW laser to the frequency comb with a relative stability of ±3.62 × 10−14. The Allan deviations of the beat frequency were 8.01 × 10−16 and 2.19 × 10−16 for a gate time of 10 s and 1000 s, respectively. The findings of this study may further improve laser interferometry by providing a simple and robust method for ultrastable frequency control.

Spatial Continuous Wave Laser and Spatiotemporal VCSEL for High-Speed Long Haul Optical Wireless Communication Channels

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
I. S. Amiri ◽  
Ahmed Nabih Zaki Rashed ◽  
Abd Elnaser A. Mohammed ◽  
Ehab Salah El-Din ◽  
P. Yupapin
Keyword(s):  
Wireless Communication ◽  
High Speed ◽  
Continuous Wave ◽  
Propagation Distance ◽  
Q Factor ◽  
Optical Wireless Communication ◽  
Continuous Wave Laser ◽  
Optical Wireless ◽  
Cw Laser ◽  
Improvement Ratio

AbstractThis study has presented spatial continuous wave laser and spatiotemporal vertical cavity surface emitting laser (VCSEL) for high speed long haul optical wireless communication channels. Possible data rates range from 40 Gb/s to 250 Gb/s over propagation distance ranges from 500 km to 2500 km. The optical wireless communication (OWC) system performance is tested through the measurement of maximum Q-factor, minimum bit error rate (BER) and signal to noise ratio (SNR). It is observed that spatiotemporal VCSEL has presented better performance than CW laser in the OWC system, especially for long haul transmission applications. It is observed that SNR improvement ratio ranges from 8.15 % to 19 % by using spatiotemporal VCSEL than CW laser for bit rate of 40 Gb/s over propagation distance ranges from 500 km to 2500 km. Max. Q-factor improvement ratio ranges from 4.62 % to 13.71 % by using spatiotemporal VCSEL than CW laser for data rate of 40 Gb/s over propagation distance ranges from 500 km to 2500 km. So it is clear that spatiotemporal VCSEL is more suitable for long haul OWC applications than other optical sources.

Improved Adhesion Strength of Metal Textile Composites by Surface Texturing Using TIG Arc or CW Laser Process

2017 ◽  
Vol 742 ◽  
pp. 341-348
Author(s):  
Marén Gültner ◽  
Anna Große ◽  
Martin Lohse ◽  
Martin Hertel ◽  
Uwe Füssel ◽  
...  
Keyword(s):  
Adhesion Strength ◽  
Continuous Wave ◽  
Surface Texturing ◽  
Single Mode ◽  
Textile Composites ◽  
Laser Method ◽  
Laser Process ◽  
Cw Laser ◽  
The One ◽  
Aluminum Surfaces

Within the framework of the bilateral CORNET projects MeTexCom and MeTexCom2, new approaches were developed and tested to improve the adhesion strength of metal textile composites, with a focus on the targeted roughening of aluminum surfaces and the development of new acoustically insulating nonwovens. The metal textile composites were produced by melting thermoplastic components of the textile composites without a separately applied adhesive.For improved adhesion strength between metal and textile, roughness was generated on the metal surface by means of a novel arc treatment by an anodic polarized TIG process or a cw (continuous wave) fiber laser process. On the one hand, the goal was to produce uniformly rough, untercut surface structures in micro-and nanodimension by means of a highly dynamic arcing process. On the other hand, a similar approach was pursued with the cw laser method by using a single-mode as well as a multi-mode laser.

Mechanisms of the blue emission of NaYF4:Tm3+ nanoparticles excited by an 800 nm continuous wave laser

2016 ◽  
Vol 18 (37) ◽  
pp. 25905-25914 ◽  
Author(s):  
Hongxin Zhang ◽  
Tianqing Jia ◽  
Xiaoying Shang ◽  
Shian Zhang ◽  
Zhenrong Sun ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Laser Excitation ◽  
Blue Emission ◽  
Quantum Transition ◽  
Continuous Wave Laser ◽  
Cw Laser ◽  
Wave Laser

Simultaneous multiwavelength excitation and the quantum transition principle are utilized to study the blue emission mechanisms of NaYF4:Tm3+ UCNPs under 800 nm CW laser excitation.

Probe Mobile Device Design Based on a Weak Magnetic Detection Technology

2014 ◽  
Vol 800-801 ◽  
pp. 771-775
Author(s):  
Feng Yun Yu
Keyword(s):  
Mobile Devices ◽  
Mobile Device ◽  
Simple Structure ◽  
Single Point ◽  
Dual Use ◽  
Point Measurement ◽  
Screw Drive ◽  
Detection Technology ◽  
Transmission Part ◽  
Magnetic Detection

Design and calculation of dual-use spiral mobile devices for horizontal and vertical, according to the principle of screw drive meet the needs of the weak magnetic detection technology. The device consists of the support part, guide part and transmission part, simple structure, may be supporting the use with weak magnetic equipment for the handheld single point measurement, and drive probe mobile to complete the measurement and maintained liftoff value unchanged in mobile. Carry on a large number of weak magnetic detection experiments using the device, the results proved that this probe mobile device easy to use, reliable mobile precision to meet the testing requirements.

Evaporative Cutting of a Semitransparent Body With a Moving CW Laser

1988 ◽  
Vol 110 (4a) ◽  
pp. 924-930 ◽  
Author(s):  
H. Abakians ◽  
M. F. Modest
Keyword(s):  
Laser Beam ◽  
Integral Method ◽  
Continuous Wave ◽  
Nonlinear Partial Differential Equations ◽  
Groove Depth ◽  
Surface Heat ◽  
Heat Losses ◽  
Gaussian Laser Beam ◽  
Cw Laser ◽  
Partial Evaporation

The formation of a groove by partial evaporation of a moving semi-infinite and semitransparent solid is considered. Evaporative removal of material is achieved by focusing a high-power, highly concentrated Gaussian laser beam of continuous wave (CW) onto the surface of the solid. Surface heat losses due to radiation and convection are assumed to be negligible, and conductive losses are treated in an approximate fashion using a simple integral method. The relevant nonlinear partial differential equations are solved numerically, and results for groove depth and shape are presented for a variety of laser and solid parameters.

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