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CONTENTS Mar/ Apr 2018 Issue 2

14 COVER STORY
Excimer Laser
The application of excimer laser presents a diversified development trend
After 40 years of development, excimer laser technology has been widely used, and is still
being improved and improved. We are very optimistic about the prospect of the excimer
laser.
TECHNOLOGIES CENTER

30 Fiber Design
a) Fiber longitudinal length Large-mode-area graded-index fiber
b) Fiber longitudinal length
(mm) (mm)
300
300 design to boost fiber-laser powers
240 1.0 0.8 1.0 0.8 240
180 0.6 0.6 180
0.4 0.2 Researchers have taken a different approach
0.4
0.2
8 MARKET WATCH 120 60 0.005 by changing the conventionally step-index
120
0.001
60
fiber design, which reduces leakage loss while
0 0 20 40 60 80 100 Fiber transverse 0 20 40 60 80 100 0
position (µm)
Five photonics trends for 2018 maintaining the higher-order-mode suppression
As the new year begins, a few trends in photonics such as of the conventionally design.
lidar or additive manufacturing are obvious, while others
may be less apparent. 31 Fiber Lasers
Four reasons to choose fiber lasers
激光束
材料等离子体
More companies than ever before are investing
表面层
18 APPLICATIONS 厚度 吸收 热影响区 in fiber lasers. The article introduces fiber lasers
advantages in speed, energy efficiency, lifetime
基底材料 and laser power.
Laser leaning 反射
Cleaning the rusty layer on the rail surface
with fiber lasers 32 Laser Diodes
The power of brilliance -- the past and
Two fiber lasers are used in combination to cleaning the Normalized $/bright watt* High-power semiconductor laser brilliance
rusty layer on the rail surface and achieve high efficiency 1,000,000 future of high-power semiconductor lasers
100,000
and high quality cleaning results. 10,000
1000 With continuously improving efficiency and power,
laser diodes will continue to displace legacy
100
10
Optical storage Optical networks Laser as a tool
20 Laser Marking 1 1985 * Bright watt = Brilliance (W/cm 2 -sr) 2000 2005technologies, both changing the way things are
2015
2020
2010
1990
1995
A new type of laser marking machine used for made and enabling new things to be made.
teaching demonstration and innovation 35 Beam Steering
A new type of laser engraving & marking machine based Laser materials processing drives new
Command
on DELTA configuration is used to meet the needs of – Error Controller Voltage Galvo + Acceleration
mirror
servo control technologies
teaching demonstration and innovation. State space Position
model sensor Digital servo technology continues to enhance existing
Calculated Measured
and emerging laser materials processing applications.
feedback feedback
State vector f(x)
24 Laser Heat Treatment feedback Observer Next-generation digital servos are expected to improve
Dynamic Spot Shaper software improves laser and support new application requirements.
heat treatment
The parameters of a scanned laser beam are dynamically 40 INTERVIEWS
altered by software, tailoring heat distribution to the
application. The Strength
Fiber optic technology equips fiber laser machines
for mass production applications in multiple
26 Wearable technologies markets.
Advancing wearable technology with light
No doubt that photonic wearable technologies still 6 EDITOR’S NOTES
relegated to the prototype stage will reach consumers
sooner than we think. 10 LEADING EDGE SNAPSHOTS
44 PRODUCTS HIGHLIGHTS
48 AD INDEX
About Laser Focus World China
Published since 2005, Laser Focus World China, the Chinese editionof the world famous Laser Focus World magazine, is the professional
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editorial content licensed exclusively from Laser Focus World magazine is supplement by content generated by our own editors in China.
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Laser Focus World China, ISSN 1817-6917 is published bi-monthly by ACT International, Unit B, 13/F, Por Yen Building, No. 478 Castle Peak Road, Cheung Sha Wan, Kowloon, Hong Kong, under the license of PennWell
Corporation, 1421 S. Sheridan Road, Tulsa, OK 74112. Copyright 2010. All rights reserved. This publication contains article reprinted from Laser Focus World magazine. Laser Focus World is exclusively owned and
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