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Er:YAG Crystal

POC-OC-122437-Er:YAG Crystal

  • Exceptional slope efficiency and stable room-temperature operation.
  • Strong absorption at the hydroxyl absorption peak (2940 nm).
  • High emission cross-section supporting efficient laser operation.
  • Robust isotropic crystal structure with high thermal conductivity.
  • Ideal for applications in the eye-safe wavelength range.

Customizable Components Available for This Material to Meet Your Specific Needs!

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Er:YAG Crystal Material General Description

Er:YAG Crystal (Erbium-doped Yttrium Aluminum Garnet) crystals are renowned for their robust performance in laser systems operating in the near-infrared spectrum, particularly at the 2940 nm wavelength. This wavelength corresponds to the hydroxyl absorption peak, allowing excellent absorption in biological tissues, making Er:YAG Crystal a preferred choice for medical, dental, and surgical laser applications. The cubic symmetry and high thermal conductivity make it thermally stable and highly reliable. The crystals are manufactured to deliver high optical quality and are suitable for both continuous-wave (CW) and pulsed operations, maintaining stable performance even under high thermal loads.

 

Er:YAG Crystal General Applications

Er:YAG Crystals have diverse applications across multiple fields:

Medical and Dental Applications

  • Efficient at 2940 nm, suitable for cutting and ablating hard tissues like bone and teeth in dentistry and orthopedics.
  • Eye-safe wavelengths enable use in non-invasive surgery.

Industrial Applications

  • High-energy pulses from Er:YAG Crystal  are ideal for material processing, engraving, and thin-film ablation.

Military and Remote Sensing

  • Eye-safe wavelengths are ideal for military applications such as rangefinders and LiDAR systems.
  • Low thermal load and high stability make them useful in rugged environments.

Examples

  • Hard tissue ablation (dental surgery, orthopedics).
  • Non-invasive laser treatment for skin rejuvenation.

High-precision cutting in industrial applications

Chemical and Structural Properties

Property

Value

Chemical Formula

Er:Y3Al5O12

Crystal Structure

Cubic Garnet

Dopant Concentration

Er: 50 at.%

Density

4.56 g/cm³

Refractive Index

1.79 (at 2940 nm)

Melting Point

1970°C

Mohs Hardness

8.5

Thermal Conductivity

13 W/m·K (at 1064 nm)

Thermal Expansion Coefficient

7.8 × 10^-6 /K

Damage Threshold

>500 MW/cm² (1064 nm, 10 ns, 10 Hz)

Optical, Laser and Nonlinear Optical Properties

Optical Parameter

Value

Laser Wavelength

2940 nm

Photon Energy

6.75 × 10^-20 J

Emission Cross Section

3 × 10^-20 cm²

Refractive Index

1.79 (at 2940 nm)

Pump Bands

600-800 nm

Lifetime of Er Energy Level

6.0 ms

Absorption Peaks

960, 1470, 1532 nm

Standard Fabrication Specifications

Parameter

Value

Rod Dimensions

Diameter: 3-6 mm; Length: 50-120 mm

Surface Quality

10/5 Scratch/Dig

Wavefront Distortion

< λ/8 @ 633 nm

Flatness

λ/10 @ 633 nm

Parallelism

20 arc sec

Perpendicularity

15 arc min

Chamfer

0.2 mm × 45°

AR Coating

R < 0.2% @ 2940 nm

Spectrum Transmission Curve:

For 2940 nm, Er:YAG demonstrates strong absorption near the hydroxyl peak and a broad emission spectrum. Customized absorption and emission curves are available upon request to optimize for specific applications.

Coating Specification:

 

  • AR Coating: Anti-reflective coating at 2940 nm with reflectivity R < 0.2%.
  • Custom coatings available upon request.
  • Adhesion Test Compliant with MIL-C-675C military standards, an adhesion test involved applying a tape that meets LT-90 specifications onto the lens film layer. The tape was affixed fully and then removed vertically. This procedure was performed three times, resulting in no blistering or peeling.
  • Temperature Test In line with MIL-C-675C specifications, test pieces were subjected to temperatures of -62±1℃ and 71±1℃. After maintaining them at room temperature (16℃~32℃) for two hours, the adhesion test was repeated, confirming no film detachment.
  • Abrasion Resistance Test Conforming to MIL-C-675C and CCC-C-440 standards, the abrasion resistance test involved a gauze tester applying a minimum force of 1.0 lbs (0.45 kg) to the film. This was repeated 25 times with gauze widths of 1/4 inch (6.4mm) and 3/8 inch (9.5mm), ensuring no damage occurred to the film surface.
  • Humidity Test Under MIL-C-675C criteria, the test piece was placed in a controlled temperature and humidity chamber set to 49 ±2℃ and 95%~100% humidity for 24 hours. The film remained intact, with no peeling, scratches, or other defects.
  • Solvent and Cleaning Testing Following MIL-C-675C specifications, test pieces were exposed to room temperature conditions (16℃~32℃) and tested with acetone and alcohol for at least 10 minutes each. After air drying and subsequent cleaning with a cotton cloth soaked in alcohol, the film surface showed no signs of peeling or scratches.
  • Salt Spray Test After 100 hours in a 35°C environment with a 5% saltwater concentration, the film showed no signs of damage.

 

POC Strength and Capabilities

 

Photonics On Crystals (POC) specializes in providing premium-grade laser crystals, offering customized dimensions, doping levels, and coating solutions tailored to diverse industrial, medical, and military requirements. Our advanced manufacturing ensures high optical quality, low defect rates, and tailored solutions for cutting-edge laser systems. Partner with POC for efficient and reliable laser materials.

Standard Products

Face Dimensions

Length

End Faces

Doping

Coatings

Price (USD)

5 × 5 mm

3 mm

Brewster-angle cut

0.15%

Uncoated

Request

5 × 5 mm

2 mm

Brewster-angle cut

50%

Uncoated

500

Customization

As required

Upon request

Up to 50%

Custom coatings

On Request

POC-OC-122437-Er YAG Crystal

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