symbiosis in laser technology - world money fair · acsys lasertechnik 2017 4 1. introduction -...

Symbiosis in Laser Technology

ACSYS Lasertechnik 2017 2

ACSYS Lasertechnik

Alexander Aminidis Application engineer ACSYS Lasertechnik GmbH


Index:

1.  Introduction 2.  State of the Art Laser Sources 3.  Engraving process 4.  Surface Qualities 5.  Ablation Rates 6.  Ensemble 7.  The Reality in samples 8.  Future laser sources 9.  Laser Systems by ACSYS


1. Introduction - Reaction

▲  Laser radiation stimulates the free electrons in the metal lattice

▲  Stimulated electrons collide with other electrons and with the atomic nuclei and produce an avalanche reaction

▲  LASER = Light Amplification by Stimulated Emission of Radiation

Laser radiation


1. Introduction - Effect

▲  Absorption of laser radiation, the material will be evarporated

▲  The duration of the laser pulse determines the thermal influence in the material

Optical penetration depth lopt = 1/α

Laserbeam Wavelenght λ, Pulsduration τ, Intensity I

Plasma

Heat affected zone

Thermal penetration depth

Deposits

Material


1. State of the Art Laser Sources

▲  Nano-Second Laser ▲  240 ns to 3 ns ▲  0,000.000.001 seconds duration ▲  More variation for laser applications ▲  thermal absorbtion likely

▲  Pico-Second Laser ▲  Fixed pulse duration of ~10 ps ▲  0,000.000.000.001 seconds duration ▲  No thermal absorbtion ▲  Cold evarporazation, no burr, smooth surface ▲  Burst mode aviable for chain of laser pulses


2. Introduction - Duration

▲  With shorter pulse durations the material does not have time to absorb heat, this effect is known as cold evaporation.

▲  Nano second ▲  Pico second


3. Engraving process

▲  The geometry of a laser engraving is generated by differently slices

▲  The slice thickness determines the quality of a laser engraving ▲  Lower slice thickness = better details ▲  Bigger slice thickness = faster engraving

▲  The slice thickness is limited. Small structures or details could not be displayed correctly if it is too high.


4. Surface Qualitites

▲  Surface roughness (Sa) in µm for different laser engraving setups ▲  Material: Böhler K455 hardened steel, lapped hardened steel

Nr. Laser Setup Roughness

1 Nano second Fast engraving Sa 0,992 µm

2 Pico second Fast engraving Sa 0,432 µm

3 Nano second Medium engraving Sa 0,499 µm

4 Pico second Medium engraving Sa 0,397 µm

5 Nano second Fine engraving Sa 0,372 µm

6 Pico second Fine engraving Sa 0,283 µm

▲  Roughness of other methodes in Ra

▲  Milling ~ 0,6 µm ▲  Planing ~ 0,2 µm ▲  Grinding ~ 0,4 µm Source: Wikipedia


5. Ablation Rates

▲  Ablation rates in mm³ per minute for different laser engraving setups ▲  5 x 5 x 0,5 mm engraved test square (volume 12,5 mm³)

Nr. Laser Volumen Setup Ablation rate

1 Nano second 12,5 mm³ Fast engraving 0,67 mm³/min.

2 Pico second 12,5 mm³ Fast engraving 0,87 mm³/min.

3 Nano second 12,5 mm³ Medium engrving 0,40 mm³/min.

4 Pico second 12,5 mm³ Medium engrving 0,60 mm³/min.

5 Nano second 12,5 mm³ Fine engraving 0,13 mm³/min.

6 Pico second 12,5 mm³ Fine engraving 0,41 mm³/min.


6. Short Second vs. Ultra Short Second

▲  Higher ablation rate with the pico second laser ▲  No reduction in surface quality when using higher ablation rates

[X-WERT]; [Y-WERT] 0,4; 0,499

0,67; 0,992

0,41; 0,283 0,6; 0,397 0,87; 0,432

0

0,2

0,4

0,6

0,8

1

1,2

0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1

SURF

ACERO

UGHN

ESS[µM]

ABLATIONRATE[MM³/MIN]

ABLATIONRATETOSURFACEROUGHNESS

Nanosecondlaser Picosecondlaser


7. What is possible? The Reality in samples...

▲  Surfaces Samples ▲  Fine surfaces and higher ablation rates with the pico second laser ▲  Pictures, 500 X magnification by laserscanning microscope

▲  Nanosecondlaser fine engraving ▲  Picosecondlaser fine engraving



▲  Engraving samples ▲  No burr with the pico second laser ▲  Finished samples, no clean-up or post-processing

Nano

Pico



▲  Microengraving Samples ▲  Enhanced details with the pico second laser ▲  Sharper geometry with the pico second laser



▲  Applications ▲  The nano second laser can do everything

a pico second laser is able to do ▲  Greater variations when frosting due to

temperature and heat effects with the nano second laser.

▲  The pico second laser is more efficent and precise when laser engraving

▲  Tilted Hight Lines are independent of the laser source

▲  Tilted Hight lines and rainbow colors

in combination



▲  Structuring ▲  Rainbow colors and micro structuring with

both laser technologies are possible ▲  Duo to cold processing the pico-second laser

has more advantage


8. Futur Laser Technologies

▲  SubNano Laser ▲  5 ns to 150 ps ▲  Compact design ▲  Thermal effect can be reduced but not

completely removed

▲  Femto Laser ▲  0,000.000.000.000.001 seconds duration ▲  Very good engraving detail ▲  Problems with high volume


PIRANHA µ PICO ▲  All new PIRANHA µ PICO ▲  Ultra-short-puls laser

version

▲  Compact machine with maximum working range

▲  Can be equipped with: ▲  Pico second laser ▲  Fiber laser ▲  Femto second laser ▲  SubNano laser ▲  Etc.


9. Lasersystems by ACSYS


Contact:

Visit our booth C25 for a live demonstration!

ACSYS Lasertechnik GmbH Leibnizstraße 9 70806 Kornwestheim

GERMANY

Tel.: +49 7154 / 808 75 0 Fax: +49 7154 / 808 75 19

E-Mail: [email protected] Web: www.acsys.de

ACSYS Lasertechnik US Inc. 8224 Nieman Road Building 5 Lenexa, KS 66214 USA

Tel.: +1 847 246 2394 Fax: +1 847 844 0519

E-Mail: [email protected] Web: www.acsyslaser.com

ACSYS Lasertechnik UK Ltd Unit 6 Silver Birches Business Park Worcestershire

United Kingdom

Tel.: +44 1527 / 870 820

E-Mail: [email protected] Web: www.acsyslaser.co.uk

symbiosis in laser technology - world money fair · acsys lasertechnik 2017 4 1. introduction -...

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