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Diffusion bonded composite crystals are high-performance laser materials formed by joining doped (active) and undoped (passive) crystals—such as Nd:YAG or Yb:YAG—at high temperatures to create a single monolithic component. These crystals, often sourced from specialized manufacturers like Photonchina or Seeopto, significantly reduce thermal lensing, boost damage thresholds, and improve beam quality in high-power, passively Q-switched, or end-pumped systems.
Key Features and Advantages
- Thermal Management: Bonding undoped end-caps (e.g., YAG or ) to the laser medium prevents "barrel effect" (surface cracking) and significantly reduces thermal lensing, as the heat is distributed over a larger volume.
- High Damage Threshold: The interface is typically bonded at temperatures up to 2/3 of the melting point, creating a seamless joint with no adhesive, which withstands higher pump powers.
- Compact Design: These structures are ideal for compact laser, such as microchip lasers.
- Customizable Configurations: Components can be engineered with varied doping levels, multiple segments, and shapes like slabs, rods, or prisms.
Common Diffusion Bonded Combinations
- Nd:YAG + YAG / Yb:YAG + YAG: Standard for reducing thermal lensing.
- +: Used for high-power-based lasers.
- Cr:YAG + Nd:YAG: Combined, passive Q-switching elements.
Manufacturing Process
Diffusion bonding is a solid-state joining process that involves:
Diffusion bonding is a solid-state joining process that involves:
- Optical Contact: High-precision polishing and cleaning to ensure perfect surface mating.
- High-Temperature Bonding: Heating the components to near-melting temperatures for hours, causing atoms to diffuse across the interface and forming a single, rugged unit.
These components are crucial for enhancing performance in high-power DPSSL (Diode-Pumped Solid-State Lasers). For detailed technical considerations regarding composite crystal design, see resources from RP Photonics.
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Composite Laser Crystals
RP Photonics
https://www.rp-photonics.com › Encyclopedia
RP Photonics
https://www.rp-photonics.com › Encyclopedia
The composite (or diffusion-bonded) laser crystals consist of two crystals that are fixed together to form a monolithic design. The most popular combination ...Read more
Diffusion Bonded Crystals
Seeopto
https://seeopto.com › Products
Seeopto
https://seeopto.com › Products
Diffusion bonded crystals consist of one laser crystal and one or two undoped material. They are combined by optical contact method and further bonded under ...Read more
Diffusion Bonded Crystals – YVO4,YAG,YLF,KTP,BBO, ...
Photonchina
https://www.photonchinaa.com › Crystal Optics
Photonchina
https://www.photonchinaa.com › Crystal Optics
Diffusion bonded crystals are able to significantly mitigate thermal lensing effect of laser crystals, thus providing integral components for compact lasers.Read more
Diffusion Bonded crystals
HG Optronics.,INC.
https://www.hgoptronics.com › diffusion-bonded-crysta...
HG Optronics.,INC.
https://www.hgoptronics.com › diffusion-bonded-crysta...
Diffusion bonded crystals consist of one laser crystal and one or two undoped material. They are combined by optical contact method and further bonded under ...Read more
Diffusion Bonded Crystals - Castech
castech.com
https://www.castech.com › product › Diffusion-Bonded-...
castech.com
https://www.castech.com › product › Diffusion-Bonded-...
Diffusion Bonded Crystals consist of one laser crystal and one or two undoped material. They are combined by optical contact method and further bonded under ...Read more
Diffusion-bonded composites of YAG single crystals
SPIE Digital Library
https://www.spiedigitallibrary.org › 12.60125.full
SPIE Digital Library
https://www.spiedigitallibrary.org › 12.60125.full
by HC Lee1992Cited by 72 — Diffusion bonding of single crystal Nd:YAG with another Nd:YAG or undoped YAG involves precision polishing, assembly by optical contacting and heat treatment.Read more
Diffusion Bonded Crystals Supplier
Stanford Advanced Materials
https://www.samaterials.com › laser-crystal › 474-diffusi...
Stanford Advanced Materials
https://www.samaterials.com › laser-crystal › 474-diffusi...
Diffusion Bonded Crystals (DBC) are crystals consisting of two, three, or more parts with different doping levels or different doping, usually one laser crystal ...Read more
Nd:YAG + YAG Endcaps (Diffusion bonded)
Newlight Photonics Inc.
https://www.newlightphotonics.com › Laser-Crystals › Di...
Newlight Photonics Inc.
https://www.newlightphotonics.com › Laser-Crystals › Di...
Nd:YAG crystals with one or two ends diffusion bonded with pure YAG endcap(s) are developed to reduce thermal effects at high power.Read more
Diffusion Bonding Crystal,Composite Laser Crystals
Bluebean Optical
http://bbotech.com › product
Bluebean Optical
http://bbotech.com › product
Diffusion Bonding Crystals are crystals consisting of two, three or more parts with different dopant levels or different dopant. Usually, one laser crystal ...Read more
What is Bonding Crystal - SZLASER
SZLASER
https://www.szlaser.com › Wiki
SZLASER
https://www.szlaser.com › Wiki
Aug 27, 2022 — Composite laser crystals are laser crystals obtained from different materials. Binderless diffusion bonding is usually used, and the surface ...Read more
Scholarly articles for Diffusion Bonded Composite Crystals | |
Diffusion-bonded composites of YAG single crystals - Lee - Cited by 72 … diffusion-bonding composite YVO4/Nd: GdVO4 crystal - Chen - Cited by 40 … composite by pressureless thermal diffusion bonding - Feng - Cited by 13 | |