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Femtosecond Laser Pulse Surface Structuring Methods and Materials Resulting Therefrom

a technology of surface structure and femtosecond laser, which is applied in the direction of vehicle components, metal-working apparatus, vehicle sealing arrangements, etc., can solve the problems of difficult or impossible to obtain material parameters, and achieve the effects of improving material absorption, affecting material absorption, and affecting material absorption

Inactive Publication Date: 2008-12-04
UNIVERSITY OF ROCHESTER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about using femtosecond laser pulses to process materials, including altering their surface structure. This can lead to increased absorption, surface area, and coloring of materials. The methods can be used to create uniformly colored metals and non-uniformly colored metals, as well as blackened materials. The color is caused by the nanostructuring of the surface of the metal, which is different from other methods that may involve artificial coloring or other non-femtosecond laser pulse-induced nanostructuring. The base metal, which is the metal before femtosecond laser surface structuring, has lower absorption than the treated material.

Problems solved by technology

Another difference between different laser pulse timescales is that the laser-supported combustion and detonation waves that are commonly generated in a nanosecond duration laser pulse do not occur in an ultra-short fs laser pulse, again offering up the possibility of materials processing effects and resulting material parameters that may be difficult or impossible to obtain with longer duration laser irradiation.

Method used

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  • Femtosecond Laser Pulse Surface Structuring Methods and Materials Resulting Therefrom
  • Femtosecond Laser Pulse Surface Structuring Methods and Materials Resulting Therefrom
  • Femtosecond Laser Pulse Surface Structuring Methods and Materials Resulting Therefrom

Examples

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example 1

[0089]Experiments in support of embodiments of the invention have demonstrated that a significant amount of residual thermal energy is deposited in metal samples following multi-shot femtosecond laser ablation. Traditionally, it was commonly believed that one of the most important advantages of femtosecond laser ablation is that the energy deposited by ultrashort laser pulses does not have enough time to move into the bulk sample; therefore, the residual thermal energy remaining in the bulk sample should be negligible. In contrast to this, a significant enhancement in laser light absorption was observed recently by the inventors following ablation. To understand the physical mechanisms of laser energy absorption, the change in absorptance of gold due to structural modifications following multi-shot femtosecond laser ablation was directly measured. The measured data indicates that there is a significant absorption enhancement due to nanostructuring in addition to the known mechanisms...

example 2

[0102]In this Example, a comparative study of residual thermal effects in aluminum following fs laser ablation was performed. At laser fluences above the ablation threshold where plasmas are produced and at a sufficiently high ambient gas pressure, an enhanced coupling of pulsed laser energy into the sample occurs. Furthermore, in contrast to the conventional understanding that residual thermal energy is negligible in fs-laser ablation, up to 70% of the incident pulse energy can be retained in the sample following single-pulse fs-laser ablation in 1-atm air. The major factors influencing thermal energy coupling to the sample are the laser fluence and ambient gas pressure. Residual thermal energy deposition decreases with reducing ambient gas pressure.

[0103]Laser ablation using femtosecond (fs) laser pulses has numerous applications in the field of materials processing and machining and, nanotechnology. Comparative studies have demonstrated that femtosecond laser ablation has advanta...

example 3

[0116]Unique properties of nanomaterials have been extensively studied in the past and various nanostructures have found numerous applications in optics including enhanced x-ray emission and enhanced absorption in intense light-matter interaction, and optical biosensing, to name a few. Direct surface nanostructuring (i.e., not from ablated plume deposition) may be used in a number of technological applications, for example, manipulation of optical properties of solids, catalysts, dental implants, etc. We performed a detailed study of the morphology of surface nanomodifications produced on bulk metals using a femtosecond laser ablation technique embodied herein. The effects of laser fluence and number of applied pulses on the generated surface nanostructures were studied with a scanning electron microscope (SEM). According to an aspect, a set of optimal laser irradiation conditions for metal surface nanostructuring is disclosed.

[0117]In our experiment, we used an amplified Ti:sapphir...

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Abstract

Embodiments of the present invention are generally directed to materials processing methods using femtosecond duration laser pulses, and to the altered materials obtained by such methods. The resulting nanostructured (with or without macro- and micro-structuring) materials have a variety of applications, including, for example, aesthetic applications for jewelry or ornamentation; biomedical applications related to biocompatibility; catalysis applications; and modification of, for example, the optical and hydrophilic properties of materials including selective coloring.

Description

RELATED APPLICATION DATA[0001]This patent application is a continuation-in-part of, and claims priority to, U.S. application Ser. No. 11 / 862,449 filed on Sep. 27, 2007, as well as to U.S. Provisional Application Ser. No. 60 / 847,916, filed Sep. 29, 2006, the subject matters of which are herein incorporated by reference in their entireties.FEDERALLY SPONSORED RESEARCH[0002]This invention was made with government support under Contract No. CTS-042506 sponsored by the National Science Foundation. The government may have certain rights in the invention.BACKGROUND[0003]1. Field of the Invention[0004]Embodiments of the invention generally pertain to the field of materials processing and associates processed materials. More particularly, embodiments of the invention are directed to methods for processing materials using femtosecond duration laser pulses, applications of such methods, and materials and / or material properties resulting from such methods. Even more particularly, embodiments of...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B3/02B23K26/38
CPCB23K26/0009Y10T428/12201B23K26/0018B23K26/0036B23K26/0039B23K26/0042B23K26/0045B23K26/0048B23K26/0084B23K26/0635B82Y30/00B82Y40/00C21D1/09C21D8/0294C22F3/00B23K26/0012Y10T428/12993B23K26/0015B23K26/0006B23K26/0624B23K26/361B23K26/355B23K2103/05B23K2103/08B23K2103/10B23K2103/12B23K2103/14B23K2103/16B23K2103/42B23K2103/50B23K2103/52B23K2103/54B23K2103/56B23K26/362B44C1/228B23K26/352
Inventor GUO, CHUNLEIVOROBYEV, ANATOLIY Y.
Owner UNIVERSITY OF ROCHESTER
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