Development of Laser Dresser for Resin Bonded Diamond Wheel

2007 ◽  
Vol 329 ◽  
pp. 169-174 ◽  
Author(s):  
Hiroshi Matsuura ◽  
Kazuhiro Hane ◽  
Yasuhiro Kunieda ◽  
Nobuhito Yoshihara ◽  
Ji Wang Yan ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Laser Light ◽  
Laser Energy ◽  
Uv Light ◽  
Mechanical Damage ◽  
Diamond Wheel ◽  
The State ◽  
Uv Laser ◽  
Wheel Surface ◽  
Core Diameter

The state of the wheel surface after dressing is important for processing of a surface to the nano-order level. A laser dresser was developed using ultraviolet (UV) laser light, which imparts no mechanical damage to the resin bond. One feature of this system is that UV laser energy is transmitted by a special optical fiber for UV light, and is transmitted only to the resin bond. Using this newly developed laser dresser, it was possible to ablate the resin bond to a depth of over 2 microns using a fiber with a core diameter of 200 microns.

Deep-UV, Light-Assisted, Wet Etching of Compound Semiconductors

1983 ◽  
Vol 29 ◽  
Author(s):  
D. V. Podlesnik ◽  
H. H. Gilgen ◽  
R. M. Osgood
Keyword(s):  
Aspect Ratio ◽  
Visible Light ◽  
High Aspect Ratio ◽  
Laser Light ◽  
Uv Light ◽  
Compound Semiconductors ◽  
Wet Etching ◽  
Uv Laser ◽  
Via Holes ◽  
Deep Uv

ABSTRACTDeep-UV, laser-light-assisted, wet etching of compound semiconductors is reported. As ccmpared to results with visible light, the etching rates per unit power density in the ultraviolet are considerably faster; a factor of >30 is seen under typical conditions. A correlation between the UV absorption in different etching solutions and the light-enhanced etching rates is examined. Gratings with 100-nm resolution have been produced and high-aspect-ratio via-holes have been etched.

Tunable Uv Laser Photolysis of Organometallic Compounds with Product Detection by Laser Mass Spectroscopy

1988 ◽  
Vol 129 ◽  
Author(s):  
Th. Beuermann ◽  
M. Stuke
Keyword(s):  
Mass Spectroscopy ◽  
Laser Light ◽  
Uv Light ◽  
Frequency Doubling ◽  
Organometallic Compounds ◽  
Dye Laser ◽  
Laser Photolysis ◽  
Photon Absorption ◽  
Uv Laser ◽  
Group Iii

ABSTRACTWe use tunable UV laser light in the region 200-320 nm, produced by frequency doubling the output of a dye laser for the decomposition of organometallic compounds. This method has been applied to TMA, trimethylaluminum AI(CH3)3. Only theTMA monomer absorbs UV light for λ>220nm. TMA decomposes by one-photon absorption mainly into two channels: aluminum plus organic fragments and aluminummonomethyl plus organic fragments. The ratio [A1]/[AICH3] is wavelength dependent. Finally, we present a mechanism to explain the photolysis of trimethyl compounds of group III elements (Al,Ga,In).

Fabrication of Fiber Bragg Gratings in High Germania Boron Co-doped Optical Fiber by the Phase Mask Method

2012 ◽  
Author(s):  
Sulaiman Wadi Harun ◽  
Prabakaran Poopalan ◽  
Harith Ahmad
Keyword(s):  
Optical Fiber ◽  
Key Words ◽  
Continuous Wave ◽  
Uv Light ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Phase Mask ◽  
Uv Laser ◽  
Bragg Wavelength ◽  
Co Doped

Kaedah untuk menghasilkan peranti FBG yang mempunyai peratus pantulan yang tinggi diperkenalkan. Peranti FBG telah dicetak dalam gentian optik khas yang mengandungi germanium dan boron yang tinggi. Kandungan germanium ion di dalam gentian optik teras adalah sebanyak mol 20%. Cara yang digunakan ialah cara percetakan topeng fasa dengan menggunakan cahaya ultra ungu ion yang mempunyai panjang gelombang 244 nm sebagai sumber cahaya. Kami telah berjaya menghasilkan FBG yang mempunyai peratus pantulan setinggi 99.9% dan masa yang diambil untuk cetakan adalah kurang daripada 10 minit. Kata kunci: gentian optik; peranti FBG; laser UV; panjang gelombang Bragg; topeng fasa A technique to fabricate high reflectivity fiber Bragg gratings (FBGs) with minimal optics is presented. The FBG is written in high germania boron co-doped optical fiber using a phase mask with a 244 nm continuous-wave UV light as the printing source. The mol percentage of germania ion in the fiber core is about 20%. We have successfully fabricated FBGs with reflectivity as high as 99.9% in less than 10 minutes of exposure time. Key words: Optical fiber; fiber Bragg grating; UV laser; Bragg wavelength; phase mask

WLCSP Laminate Removal Using NIR Laser

2018 ◽  
Author(s):  
Chun Haur Khoo
Keyword(s):  
Near Infrared ◽  
Laser Energy ◽  
Photon Emission ◽  
Mechanical Damage ◽  
Consumer Products ◽  
Fault Isolation ◽  
Wafer Level ◽  
Isolation Technique ◽  
Laminate Layer ◽  
Nir Laser

Abstract Driven by the cost reduction and miniaturization, Wafer Level Chip Scale Packaging (WLCSP) has experienced significant growth mainly driven by mobile consumer products. Depending on the customers or manufacturing needs, the bare silicon backside of the WLCSP may be covered with a backside laminate layer. In the failure analysis lab, in order to perform the die level backside fault isolation technique using Photon Emission Microscope (PEM) or Laser Signal Injection Microscope (LSIM), the backside laminate layer needs to be removed. Most of the time, this is done using the mechanical polishing method. This paper outlines the backside laminate removal method of WLCSP using a near infrared (NIR) laser that produces laser energy in the 1,064 nm range. This method significantly reduces the sample preparation time and also reduces the risk of mechanical damage as there is no application of mechanical force. This is an effective method for WLCSP mounted on a PCB board.

scholarly journals An Optical Fiber Sensor Based on La2O2S:Eu Scintillator for Detecting Ultraviolet Radiation in Real-Time

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3754 ◽  
Author(s):  
Yongji Yan ◽  
Xu Zhang ◽  
Haopeng Li ◽  
Yu Ma ◽  
Tianci Xie ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Response Time ◽  
Electromagnetic Interference ◽  
Uv Light ◽  
Optical Fiber Sensor ◽  
Temperature Response ◽  
Superior Performance ◽  
Fiber Sensor ◽  
Uv Detectors

A novel ultraviolet (UV) optical fiber sensor (UVOFS) based on the scintillating material La2O2S:Eu has been designed, tested, and its performance compared with other scintillating materials and other conventional UV detectors. The UVOFS is based on PMMA (polymethyl methacrylate) optical fiber which includes a scintillating material. Scintillating materials provide a unique opportunity to measure UV light intensity even in the presence of strong electromagnetic interference. Five scintillating materials were compared in order to select the most appropriate one for the UVOFS. The characteristics of the sensor are reported, including a highly linear response to radiation intensity, reproducibility, temperature response, and response time (to pulsed light) based on emission from a UV source (UV fluorescence tube) centered on a wavelength of 308 nm. A direct comparison with the commercially available semiconductor-based UV sensor proves the UVOFS of this investigation shows superior performance in terms of accuracy, long-term reliability, response time and linearity.

Evaluation of the Effect of Ultraviolet Light Excitation during Characterization of Silicon Carbide Epitaxial Layers

2018 ◽  
Vol 924 ◽  
pp. 261-264
Author(s):  
Hrishikesh Das ◽  
Swapna Sunkari ◽  
Oener Akdik ◽  
Andrei Konstantinov ◽  
Krister Gumaelius ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Ultraviolet Light ◽  
Defect Detection ◽  
Uv Light ◽  
Surface Treatments ◽  
Uv Laser ◽  
Original State ◽  
Optimal Surface ◽  
Light Excitation

The scanning of Silicon Carbide (SiC) epitaxy wafers for defects by ultraviolet (UV) laser or lamps is widely prevalent. In this work, we document the effects of UV light excitation on the SiC epitaxy material. An increase in background photoluminescence (PL) is observed after repeated scans. The effect of this increase on defect detection is shown. Optimal surface treatments to recover the material back to the original state are demonstrated. Further, some surface treatments are proposed which reduce the effect of the UV light excitation and prevent to a large extent the rise in background PL.

scholarly journals Polydopamine/Transferrin Hybrid Nanoparticles for Targeted Cell-Killing

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1065 ◽  
Author(s):  
Daniel Hauser ◽  
Manuela Estermann ◽  
Ana Milosevic ◽  
Lukas Steinmetz ◽  
Dimitri Vanhecke ◽  
...  
Keyword(s):  
Cell Death ◽  
Biological Function ◽  
Uv Light ◽  
Melanoma Cells ◽  
Hybrid Nanoparticles ◽  
Apoptosis Induction ◽  
Uv Laser ◽  
Lysosomal Membrane Permeabilization ◽  
Mouse Melanoma ◽  
3D Printed

Polydopamine can form biocompatible particles that convert light into heat. Recently, a protocol has been optimized to synthesize polydopamine/protein hybrid nanoparticles that retain the biological function of proteins, and combine it with the stimuli-induced heat generation of polydopamine. We have utilized this novel system to form polydopamine particles, containing transferrin (PDA/Tf). Mouse melanoma cells, which strongly express the transferrin receptor, were exposed to PDA/Tf nanoparticles (NPs) and, subsequently, were irradiated with a UV laser. The cell death rate was monitored in real-time. When irradiated, the melanoma cells exposed to PDA/Tf NPs underwent apoptosis, faster than the control cells, pointing towards the ability of PDA/Tf to mediate UV-light-induced cell death. The system was also validated in an organotypic, 3D-printed tumor spheroid model, comprising mouse melanoma cells, and the exposure and subsequent irradiation with UV-light, yielded similar results to the 2D cell culture. The process of apoptosis was found to be targeted and mediated by the lysosomal membrane permeabilization. Therefore, the herein presented polydopamine/protein NPs constitute a versatile and stable system for cancer cell-targeting and photothermal apoptosis induction.

scholarly journals Special Issue “Optical Fiber Interferometric Sensors: New Production Methodologies and Novel Applications”

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 389
Author(s):  
M. Fátima Domingues ◽  
Nélia Alberto ◽  
Paulo André
Keyword(s):  
Optical Fiber ◽  
State Of The Art ◽  
The State ◽  
Special Issue ◽  
New Production ◽  
Interferometric Sensors ◽  
Novel Applications

The collection of papers presented in this Special Issue (SI) portraits the state-of-the-art of photonic-based interferometric sensors, where new application areas were explored (such as spirometry) and novel sensitivity limits were achieved, using innovative sensing techniques for the monitoring of parameters, such as displacement, temperature or salinity.

scholarly journals New Type of 66kV XLPE Submarine Cable with Mechanical-Damage-Detectable-Sensor by Optical Fiber

1992 ◽  
Vol 112 (10) ◽  
pp. 921-926
Author(s):  
Toshio Nishimoto ◽  
Hideo Komiyama ◽  
Tsutomu Miyahara ◽  
Fuminori Tateno ◽  
Hiroshi Yamanouchi ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Mechanical Damage ◽  
Submarine Cable ◽  
New Type
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