Volume gratings and welding of glass/plastic by femtosecond laser direct writing

Femtosecond laser direct writing is used to fabricate diffractive optical elements in three dimensions and to weld glass and/or plastic. In this paper, we review volume gratings in plastics and welding of glass/plastic by femtosecond laser direct writing. Volume gratings were embedded inside polymethyl methacrylate (PMMA) by femtosecond laser pulses. The diffraction efficiency of the gratings increased after fabrication and reached the maximum. After an initial slow decrease within first several days after the fabrication, the efficiency increased again. This phenomena was called regeneration of the grating. We also demonstrate welding of PMMA by dendrite pattern using femtosecond laser pulses. Laser pulses are focused at the interface of two PMMA substrates with an air gap and melted materials in laser-irradiated region spread within a gap of the substrates and dendrite morphology of melted PMMA was observed outside the laser irradiated area. Finally, we show welding of glass/plastic and metal.

[1]  Saulius Juodkazis,et al.  Regeneration of a Grating in PMMA Inscribed by Femtosecond Laser Bessel Beam , 2017 .

[2]  K. Itoh,et al.  Ultrafast Processes for Bulk Modification of Transparent Materials , 2006 .

[3]  D. Hand,et al.  Towards industrial ultrafast laser microwelding: SiO2 and BK7 to aluminum alloy. , 2017, Applied optics.

[4]  Dan Grobnic,et al.  Low loss Type II regenerative Bragg gratings made with ultrafast radiation. , 2016, Optics express.

[5]  John Canning,et al.  Regeneration, regenerated gratings and composite glass properties: the implications for high temperature micro and nano milling and optical sensing , 2016 .

[6]  Saulius Juodkazis,et al.  Ultrafast laser processing of materials: from science to industry , 2016, Light: Science & Applications.

[7]  M. Kuzyk,et al.  Femtosecond bulk transparent material processing and recovery. , 2009, Optics express.

[8]  A. Tünnermann,et al.  Bonding of glass with femtosecond laser pulses at high repetition rates , 2011 .

[9]  J. Rault,et al.  Origin of the Vogel-Fulcher-Tammann law in glass-forming materials : the α-β bifurcation , 2000 .

[10]  K. Itoh,et al.  Direct Welding between Copper and Glass Substrates with Femtosecond Laser Pulses , 2008 .

[11]  G. Dearden,et al.  High-speed uniform parallel 3D refractive index micro-structuring of poly(methyl methacrylate) for volume phase gratings , 2010 .

[12]  Guodong Zhang,et al.  Direct welding of glass and metal by 1  kHz femtosecond laser pulses. , 2015, Applied optics.

[13]  Saulius Juodkazis,et al.  Dielectric breakdown of rubber materials by femtosecond irradiation , 2003 .

[14]  Li Ding,et al.  Femtosecond laser micromachining of waveguides in silicone-based hydrogel polymers. , 2008, Applied optics.

[15]  Patricia Scully,et al.  NUV femtosecond laser inscription of volume Bragg gratings in poly(methyl)methacrylate with linear and circular polarizations , 2013 .

[16]  Kazuyoshi Itoh,et al.  Increasing diffraction efficiency by heating phase gratings formed by femtosecond laser irradiation in poly(methyl methacrylate) , 2009 .

[17]  Kazuyuki Hirao,et al.  Diffraction Measurement of Grating Structure Induced by Irradiation of Femtosecond Laser Pulse in Acrylate Block Copolymers , 2002 .

[18]  Saulius Juodkazis,et al.  Regenerated volume gratings in PMMA after femtosecond laser writing. , 2017, Optics letters.

[19]  Yan Li,et al.  [INVITED] Ultrafast laser micro-processing of transparent material , 2016 .

[20]  J. Nishii,et al.  Welding of Transparent Materials Using Femtosecond Laser Pulses , 2005 .

[21]  Caterina Gaudiuso,et al.  Welding of PMMA by a femtosecond fiber laser. , 2015, Optics express.

[22]  Kwang-Ryul Kim,et al.  Femtosecond laser embedded grating micromachining of flexible PDMS plates , 2009 .

[23]  Li Ding,et al.  Large refractive index change in silicone-based and non-silicone-based hydrogel polymers induced by femtosecond laser micro-machining. , 2006, Optics express.

[24]  Kazuyoshi Itoh,et al.  Three-Dimensional Waveguides Fabricated in Poly(methyl methacrylate) by a Femtosecond Laser , 2006 .

[25]  Andreas Tünnermann,et al.  [INVITED] Laser welding of glasses at high repetition rates – Fundamentals and prospects☆ , 2016 .

[26]  E. Mazur,et al.  Femtosecond laser micromachining in transparent materials , 2008 .

[27]  Ralf Hellmann,et al.  Welding of transparent polymers using femtosecond laser , 2016 .

[28]  Saulius Juodkazis,et al.  Dendrite-joining of air-gap-separated PMMA substrates using ultrashort laser pulses , 2017 .