A Two-Photon Femtosecond Laser System for Three-Dimensional Microfabrication and Data Storage

The photo-polymerization induced by Two-Photon Absorption (TPA) is tightly confined in the focus because the efficiency of TPA is proportional to the square of intensity. Three-dimensional (3D) micro-fabrication can be achieved by controlling the movement of the focus. Based on this theory, a system for 3D-micro-fabrication with femtosecond laser is proposed. The system consists of a laser system, a microscope system, a real-time detection system and a 3D-movement system, etc. The precision of micro-machining reaches a level down to 700nm linewidth. The line width was inversely proportional to the fabrication speed, but proportional to laser power and NA. The experiment results were simulated, beam waist of 0.413μm and TPA cross section of 2×10-54cm4s was obtained. While we tried to optimize parameters, we also did some research about its applications. With TPA photo-polymerization by means of our experimental system, 3D photonic crystal of wood-pile structure twelve layers and photonic crystal fiber are manufactured. These results proved that the micro-fabrication system of TPA can not only obtain the resolution down to sub-micron level, but also realize real 3D micro-fabrication.

Download Full-text

Rapid Fabrication of Continuous Surface Fresnel Microlens Array by Femtosecond Laser Focal Field Engineering

Micromachines ◽

10.3390/mi11020112 ◽

2020 ◽

Vol 11 (2) ◽

pp. 112 ◽

Cited By ~ 2

Author(s):

Linyu Yan ◽

Dong Yang ◽

Qihuang Gong ◽

Yan Li

Keyword(s):

Femtosecond Laser ◽

Three Dimensional ◽

Fresnel Lens ◽

Two Dimensional ◽

Direct Writing ◽

Lens Array ◽

Two Photon ◽

Rapid Fabrication ◽

Continuous Surface ◽

Two Photon Polymerization

Femtosecond laser direct writing through two-photon polymerization has been widely used in precision fabrication of three-dimensional microstructures but is usually time consuming. In this article, we report the rapid fabrication of continuous surface Fresnel lens array through femtosecond laser three-dimensional focal field engineering. Each Fresnel lens is formed by continuous two-photon polymerization of the two-dimensional slices of the whole structure with one-dimensional scan of the corresponding two-dimensional engineered intensity distribution. Moreover, we anneal the lens array to improve its focusing and imaging performance.

Download Full-text

Two-photon induced three-dimensional optical data storage based on a compact DVD optical head

2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim incorporating the Australasian Conference on Optics, Lasers and Spectroscopy and the Australian Conference on Optical Fibre Technology ◽

10.1109/iqec-cleo.2011.6193941 ◽

2011 ◽

Author(s):

Md Azim Ullah ◽

Xiangping Li ◽

Xueming Cheng ◽

Jianshe Ma ◽

Min Gu

Keyword(s):

Data Storage ◽

Three Dimensional ◽

Optical Data Storage ◽

Optical Data ◽

Two Photon ◽

Optical Head

Download Full-text

Enhanced Two-Photon 3D Optical Storage in a Novel Multibranched-Dye Doped Photobleaching Polymer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.1245 ◽

2012 ◽

Vol 476-478 ◽

pp. 1245-1248 ◽

Cited By ~ 2

Author(s):

Fu Quan Guo ◽

Ji Hu ◽

Bin Guo ◽

Hao Liang

Keyword(s):

Data Storage ◽

Three Dimensional ◽

Optical Data Storage ◽

Photon Absorption ◽

Optical Data ◽

The Novel ◽

Two Photon Absorption ◽

Two Photon ◽

3D Data ◽

Femtosecond Laser Beam

A novel multibranched nonlinear dye，4, 4´, 4´´-tris(9-carbazyl-trans-styryl) triphenylamine (TCSTPA)，has been designed and synthesized aimed at two-photon absorption applications. Two-photon absorption cross section of the multibranched dye was obtained as high as 2.35×10-47cm4s photon-1molecule-1pumped with femtosecond laser beam at 800 nm. One-photon and two-photon absorption optical properties were demonstrated in solutions. Three-dimensional (3D) optical data storage experiments were carried out by two-photon photobleaching in the multibranched-dye doped polymethylmethacryate (PMMA) with a 3D data storage density of approximate 14 Gbits/cm3. Research on the two-photon photobleaching ability shows the novel two-photon absorption dye with multibranched molecular motif has higher photosensitivity than traditional linear two-photon absorption dyes do.

Download Full-text

Two-Photon Three-Dimensional Optical Storage of a New Photobleaching Material

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.532-533.8 ◽

2012 ◽

Vol 532-533 ◽

pp. 8-11

Author(s):

Jian Wen Cai

Keyword(s):

Data Storage ◽

Three Dimensional ◽

Optical Storage ◽

Optical Data Storage ◽

High Density ◽

Information Storage ◽

Optical Data ◽

Optical Information ◽

Two Photon ◽

Optical Information Storage

Two-photon three-dimensional optical data storage is an important method to realize high density storage and ultra-high density storage. This paper introduces the the basic principle of two-photon photobleaching optical storage, describes two-photon three-dimensional optical storage system and the absorption and fluorescence spectra of a new type of photobleaching materials BASF in detail, carries out the experimental study that two-photon information is written and read out against a new photobleaching material of BASF using femtosecond pulse laser wavelength is 800nm, and realize two layers of optical information storage, the information point spacing is 8μm and the interlayer distance is 15μm; two-layer information point signal strength is recognized using Recognition algorithm. The experiment proved that new photobleaching material of BASF can be used for two-photon three-dimensional optical storage, that has laid a solid foundation for the high-density and ultra-high density optical information storage materials research.

Download Full-text

Fabrication Technology of Involute Micro Gear Based on Two-Photon of Femtosecond Laser

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.670 ◽

2010 ◽

Vol 44-47 ◽

pp. 670-674 ◽

Cited By ~ 1

Author(s):

Shu Feng Sun

Keyword(s):

Femtosecond Laser ◽

Light Source ◽

Single Photon ◽

Three Dimensional ◽

Photon Absorption ◽

Micro Electro Mechanical Systems ◽

Excitation Light ◽

Two Photon ◽

Machining System ◽

Set Up

Microfabrication is a kind of critical technology for the development of Micro Electro-Mechanical Systems (MEMS). The frequently-used microfabrication technologies are electric discharge machining, photoetching, LIGA and laser fabrication, et al. Micro structures may be fabricated by these technologies. The polymerization principle of two-photon of femtosecond laser is different from that of single-photon. Photoinitiator of photosensing material absorbs two photons simultaneously to accomplish energy level transition and to induce the material to occur photochemical reaction. For the material absorbing two photons, the energy of each photon is equivalent to half of the energy that needed by the material transiting from ground state to excited state. It is also equal to half of the energy needed by the material occurring single-photon absorption. Therefore, the photonic frequency of two-photon excitation light source is half of the single-photon light source. According to two-photon fabrication principle, machining system of two-photon of femtosecond laser is set up. Which includes light path transmission equipment, three dimensional micro displacement scanning stage and control software, et al. Involute micro gear is fabricated by two-photon of femtosecond laser generated by the system.

Download Full-text