CTH:YAG Single Crystal Substrates

Description

CTH:YAG (Chromium, Thulium, and Holmium co-doped Yttrium Aluminum Garnet) single crystal substrates are highly regarded for their outstanding laser performance in the eye-safe near-infrared (NIR) region, particularly around 2.1 µm.

These substrates are extensively used for solid-state laser applications, medical laser systems, range-finding, lidar, and scientific research.

We offer high-quality CTH:YAG crystals with excellent optical homogeneity, precise orientation, and superior laser properties to meet demanding device fabrication needs.

Crystal Structure and Orientation:

Chemical Formula: (Cr³⁺, Tm³⁺, Ho³⁺):Y₃Al₅O₁₂
Crystal Structure: Cubic, garnet structure
Space Group: Ia3d
Lattice Constant: a = 12.01 Å
Density: ~4.56 g/cm³
Melting Point: ~1970°C
Thermal Expansion Coefficient: 7.8 × 10⁻⁶/K
Available Orientations:
- (111) (standard for laser applications)
- (100) and (110) orientations available on request

Key Properties and Advantages:

Efficient Eye-Safe Laser Emission: Strong laser output around 2.1 µm, ideal for safe medical and military applications.
Self-Q-Switching Capability: Enabling compact laser designs without external modulators.
High Optical Homogeneity: Ensures stable laser performance with minimal beam distortion.
High Thermal Conductivity: Supports high-power laser operation with effective heat management.
Long Fluorescence Lifetime: Enhances energy storage for pulsed laser systems.
Excellent Mechanical and Chemical Stability: Resistant to environmental degradation.
Direct Diode Pumping Compatibility: Allows for highly efficient, compact laser systems.

Typical Applications:

Eye-safe medical laser systems (e.g., ophthalmology, dermatology)
Lidar and range-finding systems
Military and aerospace laser communication
Remote sensing instruments
Solid-state mid-infrared laser sources
Spectroscopy and scientific research lasers
Laser marking and material processing

Specifications:

Doping Concentrations	Cr³⁺: ~0.5 at%, Tm³⁺: ~5 at%, Ho³⁺: ~0.36 at% (typical)
Diameter	10 mm – 50 mm (customizable)
Thickness	0.5 mm – 5.0 mm
Orientation	<100>, <111>, <110>
Surface Finish	Single-side polished (SSP) or double-side polished (DSP)
Surface Quality	10-5 or 20-10 Scratch-Dig (per MIL-PRF-13830B)
Parallelism	< 10 arc seconds
Surface Flatness	λ/10 @ 632.8 nm
Extinction Ratio	> 25 dB (for optical axis accuracy)
Crystal Growth Method	Czochralski method

Available Sizes and Customization:

Sizes: 10 mm × 10 mm, 20 mm × 20 mm, 25 mm diameter, custom
Thickness Options: 0.5 mm, 1 mm, 2 mm, up to 5 mm, customizable
Surface Polishing:
- DSP (Double-Side Polished) for epitaxial growth and laser cavities
- SSP (Single-Side Polished) for mounting or bonding
Orientation Tolerance: ±0.5°
Edge Options: Laser-cut, bevelled or chamfered edges for safe handling
Defect Control: Low dislocation density and minimal inclusions

Quality Assurance:

Our CTH:YAG substrates are produced and processed under strict quality control standards:

High-Resolution X-Ray Diffraction (HRXRD) to confirm crystal perfection
Polarized light microscopy to inspect internal defects
Surface quality verified by optical interferometry and scratch-dig inspection
Chemical and mechanical stability tested under harsh conditions
Cleanroom packaging (Class 1000) ensures contamination-free delivery

Why Choose Our CTH:YAG Single Crystal Substrates?

High optical uniformity and superior laser performance
Accurate doping levels for optimal eye-safe 2.1 µm laser emission
High mechanical strength and chemical durability
Custom sizes, orientations, and finishes available
Strict quality assurance and full technical support
Fast delivery and worldwide shipping services

Ordering & Contact Information:

Tinsan Materials offers flexible MOQ (Minimum Order Quantity) and competitive pricing. Our substrates are packaged in Class 100 cleanroom environments and shipped worldwide. For custom orders or technical inquiries, please contact us for a detailed consultation!