| Popis: |
We present an overview of recent improvements in the application of ultra-short pulsed disc lasers with 5 to 10 W average output power and 400 to 800 femtosecond pulse widths for the manufacturing of parts for medical device, automotive, aerospace and other industries.New results of microscopically burr-free and damage-free femtosecond laser machining of applications, which are difficult to process with mechanical tools or continuous wave laser sources will be demonstrated, including: high speed cutting of 110 µm thick Polylactide material for novel bio-resorbable medical stents; high speed cutting of 100 µm thick NiTi material for medical device applications; high speed cutting of long axial micro-slots in stainless steel medical cannulas. The feature sizes of new devices range from 10 micron struts in .08 mm walls of Nitinol tubes. Other features require zero or negative taper holes such as .07 mm holes in Platinum used in medical surgery. Catheters used for removing blood clots in the brain use zero taper holes to reduce back pressure in the surgery device. Other applications for femtosecond lasers are drilling of GDI fuel injectors or sensors, or micro machining of glass. Femtosecond lasers can create shaped holes with lead in features and or textured walls not possible before. These exemplary applications illustrate the increasing need for highly economical process technologies for manufacturing microscale features. Femtosecond disk laser processing uses very high peak powers of hundreds of megawatt and thus gives additional freedom by combining very small heat affected zones, high quality results and highly productive ablation rates. A particular strength of femtosecond pulse micro-processing is that it is able to maintain, instead of impair, the special mechanical, electrical, biological or other properties of high tech materials.Since femtosecond lasers gain in importance for micro-machining, we will also report about tuning aspects of laser and focusing parameters and consider the dependency of the productivity of femtosecond disk laser sources from their output power.We present an overview of recent improvements in the application of ultra-short pulsed disc lasers with 5 to 10 W average output power and 400 to 800 femtosecond pulse widths for the manufacturing of parts for medical device, automotive, aerospace and other industries.New results of microscopically burr-free and damage-free femtosecond laser machining of applications, which are difficult to process with mechanical tools or continuous wave laser sources will be demonstrated, including: high speed cutting of 110 µm thick Polylactide material for novel bio-resorbable medical stents; high speed cutting of 100 µm thick NiTi material for medical device applications; high speed cutting of long axial micro-slots in stainless steel medical cannulas. The feature sizes of new devices range from 10 micron struts in .08 mm walls of Nitinol tubes. Other features require zero or negative taper holes such as .07 mm holes in Platinum used in medical surgery. Catheters used for removing blood clots in the brain use zero ta... |
