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Diffusion Bonding Crystal – Thermal Diffusion Bonding

Diffusion Bonding Crystal - Thermal Diffusion Bonding

Date: 03 Nov, 2022

Author: Crylink

Diffusion Bonding Crystal is a sort of product that incorporates laser Crystal with pure homogeneous substrate material by thermal Diffusion Bonding innovation. The Bonding item can successfully lower the thermal lensing effect of laser Crystal under the condition of high-power pumping.

Crystal bonding describes the interactions of atoms, ions, or molecules that make up a crystal. Fundamentally, it depends on the Coulomb interaction between fragments, however it can be separated into van der Waals force (or van der Waals pressure), ionic bond, covalent bond, metallic bond as well as hydrogen bond in terms of its indication.

Crystal bonding technology is the homogeneous or heterogeneous crystal products, crystal preparation (that is, surface processing), cleaning, activation therapy, without the use of any kind of bonding material, under certain problems directly match one, crystal through van der Waals force, molecular pressure, even atomic force together.

Crystal bonding technology plays a crucial function in the study of new optical tools and also brand-new solid-state lasers.

Bonding Process:

Bonding: electrostatic bonding, hot bonding, “composite” bonding. The purpose of bonding is to “bond” numerous substratums by exterior activity. Various bonding modes, various bonding principles

Electrostatic Bonding:

Electrostatic bonding: Recommended by Wallis and also Pomerantz in 1969, electrostatic bonding is a method of bonding glass with steels, alloys or semiconductors without any binder

Principle:

Hot Bonding:

Hot bonding: after high temperature treatment, the silicon wafers are straight bonded together. Lasky proposed

“Substance” Bonding:

Bonding is completed by the response between the intermediate layers.

Advantages of Bound Crystals:

Advantages of Bonded Crystals:

The thermal performance and beam quality of laser can be improved by bonding crystal.

When the laser operates, only part of the pump energy is converted into the laser. The rest of the energy is consumed by other competing mechanisms (such as spontaneous radiation, residual absorption, etc.) to generate heat in the laser medium. In general, a cooling system is added to a high-power laser system. Still, the cooling is only applied on the crystal surface, which makes the temperature distribution inside the laser working material uneven, which will cause the change of refractive index, thus resulting in the thermal lens effect. Due to the thermal stress, the edge of the crystal will be deformed and protrude outwardly, which will change the cavity of the laser and seriously affect the quality of the laser beam.
The thermal performance of the laser can be greatly improved by hot-bonding the crystal with better thermal conductivity or undoped crystal at both ends of the laser crystal. The reasons are as follows:

By Crylink

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