Page 5 - LFWC_JulAug2017_eMag

CONTENTS Jul/ Aug 2017 Issue 4

a) Mode 1 Mode 2
Q-switched pulse Modulated pulse
Amplitude (%) Amplitude (%)
100 100
10 Internal 0 τ 1 T 1 T T 2 +τ 1 0 Time (µs)
AOM
COVER STORY T 21 +τ 1
Amplitude (%) Amplitude (%)
100 100
Fiber Lasers External 0 τ 1 T 2 T 2 +τ 1 0 τ 1 T 2 T 2 +τ 1 Time (µs)
AOM
Power (W) Power (W)
High-power, single-mode fiber lasers advance
P p
P avg
t pulse (FWHM)
Signal
pulse 0 τ 1 T 2 T 2 +τ 1 0 τ 1 T 2 T 2 +τ 1 Time (µs)
By identifying high-power fiber laser challenges and optimizing the optical fiber
output
P avg , f rep , t pulse
b)
accordingly, a 4.3 kW single-mode output has been achieved, with further upscaling and
new ultrafast laser applications in development.
d x
v s
24 d s Laser Materials Processing
d y
Glass material
Pulsed CO 2 laser increases ablation rates for
c)
improved glass processing
5 MARKET WATCH Fraunhofer ILT has developed a more-powerful
Q-switched CO 2 laser process ,which enabling bulk
Developments and prospectives of China & 1 mm glass to be converted to sophisticated, complex, and
abroad industrial laser markets even freeform shapes.
Laser technologies will be everywhere in industrial applications, 25 Ultrafast Lasers
and applications such as laser micromachining, laser welding, Direct diode-pumped Ti:sapphire laser
metal 3D printing, laser cleaning are future potential markets. It
will be the golden age for laser technologies in the next 30 years. systems
It is now possible to use a single inexpensive 4 W
laser diode to pump a modelocked Ti:sapphire
14 APPLICATIONS a) Sample Lens Beamsplitter laser generating pulses as short as 13 fs.
comb NDF Lens
Ultrafast Micromaching Sample LO Gas Ref. signal
cell NDF Lens
LO Lens 27 Spectrometers
Femtosecond lasers for prototyping and comb Sample signal
b) Mid-IR spectrometer uses quantum-
volume production Transmission
1.2
Both prototyping and volume manufacturing for a part could 1.0 cascade laser frequency combs
0.8
be achieved just by a single femtosecond laser micromaching 0.6 Using four-wave mixing of phase-locked quantum-
0.4
platform, which will lead to time to market largely reduced. 0.2 0 cascade lasers (QCLs) to fabricate ultrastable,
0
200
1340 repeatable mid-IR frequency combs that are critical
1350 400 Time
Wavenumber 1360 600 to the development of broadband, compact mid-IR
(µs)
(cm -1 )
16 Laser Cutting spectrometers.
Identification and laser processing of fingerprint
identification modules 28 LASER SAFETY
Cutting circuit boards and cover glass of fingerprint The damage principle of laser to human
identification modules with laser, achieves advantages
such as small collapse, high speed, narrow cutting slot body
and large thickness. Learn about the damage mechanism of laser
to human tissues, determining the decisive
19 Ultrafast Processing parameters of radiation limit used by laser safety
Ultrafast lasers offer great promise as a unique levels, understanding laser safety and clearing
manufacturing tool laser product safety requirements.
Ultrafast laser processing offers advantages including LASER BRIGHTEN HUBEI
near-zero heat effect; minimal burring and debris; high
dimensional accuracy; and the ability to produce high- 30 Effects of welding head on weld forming
Picosecond laser Femtosecond laser quality small features in metals, plastics, ceramic, and glass.
of RFL-C1000 Laser
22 TECHNOLOGIES CENTER 31 HE Laser is building industry 4.0 together
with customers
Laser pulse Mid-IR Lasers
Laser Pump pulse
power (W) energy (mJ) energy
0 5 10 15 20 (mJ) 4 EDITOR’S NOTES
1.0 Ternary-crystal mid-IR laser shows power-scaling
0.8 2.0
1.5
0.6 P thresh = 48.6 mW promise 8 LEADING EDGE SNAPSHOTS
0.4 1.0
0.2 η = 16.4% Specially grown Fe:CdMnTe crystal that emits in the 5 μm
0.5
0.0 0.0 32 PRODUCTS HIGHLIGHTS
0 1 2 3 4 5 6 7 8
Pump power (W) spectral region could be made wavelength-tunable in the future.
36 AD INDEX
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