ICALEO 2012 Paper #M204 (Effect of Laser Induced Crystallinity Modification on Biodegradation Profile of Poly(L-Lactic Acid))

Effect of Laser Induced Crystallinity Modification on Biodegradation Profile of Poly(L-Lactic Acid)
Authors:
Shan-Ting Hsu, Department of Mechanical Engineering, Columbia Univ.; New York NY USA
Huade Tan, Department of Mechanical Engineering, Columbia Univ.; -
Y. Lawrence Yao, Department of Mechanical Engineering, Columbia Univ.; New York NY USA
Presented at ICALEO 2012

The biodegradable polymer such as poly(L-lactic acid) (PLLA) is promising in drug delivery applications because it hydrolyzes into non-toxic substances in physiological environments. However, its induction period of biodegradation prevents the embedded drugs from releasing at the designed rate in the...

ICALEO 2012 Paper #M202 (fs Laser Surface Processing of Platinum)

fs Laser Surface Processing of Platinum
Authors:
Stephen W. Brown, ARL, The Penn State Univ.; State College PA USA
Andrew E. Fisk, Pulse Technologies; Quakertown PA USA
Edward W. (Ted) Reutzel, ARL, The Penn State Univ.; State College PA USA
Presented at ICALEO 2012

The production of nanometer-scale features on platinum samples was investigated with the use of a femtosecond laser system operational at IR, visible and UV wavelengths. Laser induced surface structures were produced having globular nanoprotrusions with apparent length scales ranging from sub-nanometer diameters to 100s of nanometers, dependent on the laser parameters employed. Analysis of Field Emissi...

ICALEO 2012 Paper #M201 (Variation of Biocompatibility of Titanium Dioxide Film by Femtosecond Laser Irradiation)

Variation of Biocompatibility of Titanium Dioxide Film by Femtosecond Laser Irradiation
Authors:
Togo Shinonaga, Graduate School of Engineering, Osaka Univ.; Suita, Osaka Japan
Masahiro Tsukamoto, Joining and Welding Research Institute, Osaka Univ.; Ibaraki, Osaka Japan
Naoto Horigutchi, Graduate School of Engineering, Osaka Univ.; Suita, Osaka Japan
Yuichiro Ito, Graduate School of Engineering, Osaka Univ.; Suita, Osaka
Akiko Nagai, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental Unive.; Chiyoda-Ku, Tokyo Japan
Kimihiro Yamashita, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental Univ.; Chiyoda-Ku, Tok...

ICALEO 2012 Paper #M1309 (High Average Power, High Energy Femtosecond Regenerative Amplifiers)

High Average Power, High Energy Femtosecond Regenerative Amplifiers
Authors:
Martin Delaigue, Amplitude Systemes; Pessac France
Robert Braunschweig, Amplitude Laser; Pessac France
Clemens Hönninger, Amplitude Systemes; Pessac France
Eric Mottay, Amplitude Systemes; Pessac France
Presented at ICALEO 2012

Femtosecond lasers gain increasing interest because of the unique combination of ultrashort pulse duration and extreme high peak power on the GW-level. In consequence, the machining process is dominated by multiphoton processes making it essentially universal and almost any type of material can be machined with excellent precision and quality. We report on...

ICALEO 2012 Paper #M1308 (High Pulse Energy, High Beam Quality Q-Switched MOPA Laser at 500Hz)

High Pulse Energy, High Beam Quality Q-Switched MOPA Laser at 500Hz
Authors:
Zhenxu Bai, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Mingliang Long, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Liyuan Chen, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Meng Chen, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Gang Li, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Presented at ICALEO 2012

A 66.4W LD-pu...

ICALEO 2012 Paper #M1307 (High Power 532nm Square Beam Delivery)

High Power 532nm Square Beam Delivery
Authors:
Andrew A. Chesworth, Lee Laser, Inc.; Orlando FL USA
Presented at ICALEO 2012

In the last few years laser scribing has become an important process in the manufacture of solar cells. Selective ablation of surface layers requires good control of the laser and a beam having flat intensity. In this paper we describe a method for generating square profiles based on the availability of new novel fibers. In one such application, a 300x300m square beam having a flat intensity profile is generated using a high power 50W green laser. The paper describes the method for generating such a beam and the possibility for future requirements of even smaller profi...

ICALEO 2012 Paper #M1306 (Investigating PCB Processing Using Q-Switched DPSS Nanosecond Green Laser)

Investigating PCB Processing Using Q-Switched DPSS Nanosecond Green Laser
Authors:
Ashwini Tamhankar, Spectra-Physics Lasers, Newport Corporation; Santa Clara CA USA
Rajesh Patel , Spectra-Physics Lasers, Newport Corporation; Santa Clara CA USA
Presented at ICALEO 2012

Diode Pumped Solid State (DPSS) Q-switched nanosecond pulsed laser is becoming a laser of choice for a wide variety of processes in PCB manufacturing. So far the demand of higher processing speed and higher quality machining has been overcome by a higher power, higher repetition frequency and smaller pulse width lasers available in the market. Increasing the Pulse Repetition Frequency (PRF) is usually a straight for...

ICALEO 2012 Paper #M1303 (Frequency Shifting of High Intensity Picosecond Lasers by Stimulated Raman Scattering)

Frequency Shifting of High Intensity Picosecond Lasers by Stimulated Raman Scattering
Authors:
Xu Yang, Institute of Laser Engineering, Beijing Univ. of Technology; beijing Peoples Republic of China
Chen Meng, Institute of Laser Engineering, Beijing Univ. of Technology; -
Li Zhengwei, Institute of Laser Engineering, Beijing Univ. of Technology; -
Chen Liyuan, Institute of Laser Engineering, Beijing Univ. of Technology; -
Yang Chao, Institute of Laser Engineering, Beijing Univ. of Technology; -
Li Gang, Institute of Laser Engineering, Beijing Univ. of Technology; -
Presented at ICALEO 2012

In recent years, with the rapid...

ICALEO 2012 Paper #M1302 (Hundreds of Milliwatts Super-Continuum Generation in All-Fiber Laser)

Hundreds of Milliwatts Super-Continuum Generation in All-Fiber Laser
Authors:
Chang Sun, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Tingwu Ge, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Jingjing Dai, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Feng Yu, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Zhiyong Wang, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Presented at ICALEO 2012

This paper re...

ICALEO 2012 Paper #M1208 (Pulsed Laser Cutting of Bright Metals)

Pulsed Laser Cutting of Bright Metals
Authors:
Paul Harrison, SPI Lasers UK Ltd; Southampton Great Britain
Jack Gabzdyl, SPI Lasers UK Ltd; -
Presented at ICALEO 2012

Profile cutting of thin sheet bright metals can be achieved in a cost effective manner through the use of a pulsed fiber laser in conjunction with a galvanometric scanhead without co-axial assist gas. This is attractive where many batches of distinct small parts are manufactured in volume, for instance within the jewellery and the micro-electronics industries.

In this paper the capabilities of a pulsed fiber laser are considered in detail when processing bright metals such as brass, copper and silver. The effect...