High-quality welding of glass by a femtosecond laser assisted with silver nanofilm

Abstract

Glass products with high joint strength are highly demanded in the field of microelectromechanical system (MEMS). While the quality requirement of MEMS is getting higher and higher, much attention has been paid to further improving the welding strength of the glass. Herein, a femtosecond laser welding method assisted by silver nanofilm for quartz glass is proposed. To optimize the welding results, the influence of the laser power on the location of the heat-affected zone is studied. The effect of coated silver nanofilm at the interface of two glass substrates on femtosecond laser absorptivity is conducted. Also, the welding spot size under different irradiation periods is investigated. In addition, the welding strength with and without the silver nanofilm is measured and compared. It is demonstrated that the welding strength was increased nearly 20% on average by our proposed method compared with direct femtosecond laser welding. In addition, even at the lower laser power than the welding threshold, the welding process could be realized by the proposed method.

The mechanism of the welding between silica glass and 304 stainless steel using nanosecond fibre laser

“…Devices consisting of glass and metal are widely applied to many fields including semiconductor devices, automotive manufacturing, medical equipment, micro electro mechanical system, etc [1][2][3][4]. With the miniaturisation and the expansion of application fields of these devices, micro-joining between glass and metal is becoming one of the indispensable techniques for assembling and hermetic sealing of micro-components [5][6][7].…”

“…The development of these methods has been hindered because of such disadvantages as joining layer aging, poor high temperature resistance, different thermal expansion coefficients and low processing accuracy. It is difficult for these conventional methods to meet the challenge of micro-joining [1,5,7].…”

“…Therefore, laser welding has the advantages of smaller heat-affected zone, less space limitation and higher processing accuracy. It allows for the welding of dissimilar materials by limiting the impact of the different thermal expansion experienced by the two materials, showing lots of great advantages in micro-joining [1,4,7,9].…”

Hybrid Fiber-Single Crystal Fiber Chirped-Pulse Amplification System Emitting More Than 1.5 GW Peak Power With Beam Quality Better Than 1.3

“…Additionally, the beam quality better than 1.3 was obtained. This high peak power CPA system with excellent comprehensive parameters will find various applications in scientific research and industrial applications.Index Terms-single crystal fiber; high peak power; chirped pulse amplification; high-order dispersion compensation.N the last decade, ultrafast lasers have found various applications in science and industry, e.g., attosecond generation[1], THz generation[2], ultrafast pump-probe spectroscopy[3], angle resolved photoemission spectroscopy [4], and material precision machining [5][6][7][8]. Most of these femtosecond lasers are configured in chirped pulse amplification architectures.…”

“…N the last decade, ultrafast lasers have found various applications in science and industry, e.g., attosecond generation[1], THz generation[2], ultrafast pump-probe spectroscopy[3], angle resolved photoemission spectroscopy [4], and material precision machining [5][6][7][8]. Most of these femtosecond lasers are configured in chirped pulse amplification architectures.…”