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CONTENTS Nov/ Dec 2017 Issue 6

10 COVER STORY
Terahertz Imaging
Terahertz imaging tackles solar cell and semiconductor process inspection
Replacing free-space optics with fiber-coupled, integrated components allows modular
terahertz time-domain imaging systems to excel in solar and semiconductor wafer
analysis.
22 Terahertz imaging
Terahertz imaging- A technology in
Technology developments search of applications in agricultural and
Product developments QCLs
Time-domain industrial applications
BWOs
5 MARKET WATCH 1970 1990 2010 Despite losing traction for cancer and security
screening, terahertz imaging continues to target
An Western observer's perspective for idustrial several agricultural and industrial applications that
中国进出口工业激光器系统统计
887 911
794
695 724 may finally benefit terahertz equipment vendors.
进口 660 639 lasers in China
525
$ million 480
392
306 338
223
出口 98 134 202 In the view of industrial laser processing system
2010 2011 2012 2013 2014 2015 2016 2017
图片来源：大族激光 估值 25 Laser-diode Protection
manufacturers in the Western world, China is the single
largest market for their products and, potentially in the Level III How to protect your laser diode from
near future, a significant competitor in their home markets. Level I Level II Level IV electrically caused damage
Take these steps to protect your laser diodes from
13 APPLICATIONS electrostatic discharge, excessive current levels,
current spikes, and transients.
UV Fluorescent Exciting
Nozzle
Novel ultraviolet 320 nm laser source enhances 27 DPSS Lasers
Light collection
objective
Laser intercept
flow cytometry Advances in Pumping Nd:YVO 4 with
Dichroics
Filters A 320 nm laser makes high-dimensional flow cytometry VHG-stabilized Diodes
PMTs 585/42 nm 530/30 nm Side scatter easier and more economical, that will contribute to better This article discusses the advantages of upper-
biomedical analysis instrumentation. state pumping and optimization required for
fiber coupled, wavelength locked diodes, and
16 Beam Analysis also quantifies the system level trade-offs in
Real-time high-power laser beam quality implementing a VBG based solution with respect
analysis in applications to cost, power, efficiency, dynamic range.
This paper introduce a practical high-power laser beam
real-time measurement method, the further development
of innovative beam sampling can achieve real-time 30 INTERVIEW
measurements of 50~ 100kW laser power.
Dialogue to TRUMPF executives talking
19 Laser Cutting about industry developments and some
Application of fiber laser cutting machine in stainless wonderful stories
steel kitchenware and sheet metal industry Peter Leibinger, vice chairman, and Christian
This article introduces how to choose the laser cutting Schmitz, president of the laser division, of the
machine that can meet the actual needs from the aspects of TRUMPF Group shared their fascination and
laser power selection, machine tool configuration & system thoughts on the past, present, and future of
and servo selection. laser technology. It was a long and inspiring
conversation with some surprising insights.
TECHNOLOGIES CENTER
21 Tunable Lasers 4 EDITOR’S NOTES
Carbon enables record wavelength tuning for 2 6 INDUSTRY UPDATES
a)
Intensity (dB)
0 1860 2060 μm ultrafast lasers
nm Δλ = 200 nm nm 7 LEADING EDGE SNAPSHOTS
-20
Researchers at Nanjing University are now using carbon-
-40 33 PRODUCTS HIGHLIGHTS
based nanomaterials to enable record tuning range from
-60
1850 1900 1950 2000 2050 2100 36 AD INDEX
Wavelength (nm) compact and low-cost 2 μm laser oscillators.
b)
Intensity (a.u.)
2120 Δλ = ~290 nm 2408
nm nm
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
2100 2200 2300 2400
magazine for engineers, researchers, scientists, and technical professionalsin China. It provides comprehensive global coverage of optoelectronictechnologies, industrial and R&D applications, and market information. The
Wavelength (nm)
editorial content licensed exclusively from Laser Focus World magazine is supplement by content generated by our own editors in China.
Laser Focus World China is published every other month in simplified Chinese and distributed to over 9,500 qualified optoelectronics professionals in China. Through our digital magazine and website we provide
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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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