EN
产品目录
光学晶体
激光器件
客服热线（售前售后）
13805064553
Products >> 光学晶体 >> 其他晶体 >> GaSe

GaSe

GaSe, i.e., Gallium Selenide Crystal, is a high‑performance nonlinear optical crystal with excellent optical properties in the infrared region, especially in the mid‑to‑far infrared range. With its wide infrared transmission range, high nonlinear optical coefficient, and moderate birefringence, this crystal serves as a key material for realizing infrared laser frequency conversion.

Contact Inquiry
Technical Specifications
Custom specifications available upon request

Product Features

Our company has achieved significant breakthroughs in GaSe crystal growth and processing. By optimizing the vapor transport growth process, we have successfully prepared large-size, high-optical-quality GaSe single crystals, overcoming the layered growth defects commonly encountered in traditional methods. Measured results show that our GaSe crystals exhibit excellent transmission performance in the 3–18 μm band, possess high nonlinear coefficients, and demonstrate significantly improved damage threshold. They are particularly well suited for high-end application scenarios such as mid‑infrared laser generation and terahertz wave production, providing core material support for fields including spectral analysis, environmental monitoring, and national defense security.

Basic Characteristics

Property
Value
Remarks
Crystal Structure
Hexagonal
/
Lattice Parameters
a=b=3.755 Å, c=15.94 Å, Z=4, Room temperature
Room temperature
Melting Point
960 °C
/
Mohs Hardness
2–3
/
Density
4.55 g/cm³
/
Thermal Conductivity
0.5 W/m·K
Room temperature
Thermal Expansion Coefficients
α∥=17×10⁻⁶/K, α⊥=7×10⁻⁶/K, 25–300 °C
25–300 °C
Transparency Range
0.65–18 μm
Core advantage, covers mid‑ and far‑infrared
Bandgap Energy
2.0 eV
/
Refractive Index
~2.6 @ 10.6 μm
/
Nonlinear Optical Coefficient
d₂₂=54 pm/V
Core advantage, high nonlinear coefficient
Birefringence
~0.35 @ 10.6 μm
/
Damage Threshold
20 MW/cm² @ 1.06 μm, 10 ns
/
Angular Acceptance
1.2 mrad·cm (Type I, 1064 nm SHG)
/
Temperature Bandwidth
~25 °C·cm (1064 nm SHG)
/
Walk‑off Angle
2.5° (Type I, 10.6 μm DFG)
/
Electrical Resistivity
>10¹⁰ Ω·cm
Room temperature
 

GaSe Crystal Specification Parameters

Item
Specification
Dimensional Tolerance
(Φ±0.1 mm)×(L+0.2/-0.1 mm), custom sizes accepted
Clear Aperture
>90% of central region
Surface Finish
20/10 (MIL-PRF-13830B standard)
Flatness
≤λ/4 @ 10.6 μm
Transmitted Wavefront Distortion
≤λ/4 @ 10.6 μm
Parallelism
30 arcsec
Perpendicularity
15 arcmin
Angular Tolerance
≤0.5°
Chamfer
≤0.2 mm×45°
Edge Chipping
≤0.1 mm
Damage Threshold
>20 MW/cm² @ 1.06 μm, 10 ns, 10 Hz (polished substrate)
Bulk Absorption Coefficient
<0.5 cm⁻¹ @ 10.6 μm
Coating
AR coating 2–12 μm available (custom)
Shelf Life
1 year (store sealed in dry, dust‑free, room‑temperature environment)

Application Fields​

Infrared Laser Technology and Frequency Conversion​

1.1Mid‑ and Far‑Infrared Laser Generation​.
In molecular spectroscopy and environmental trace gas monitoring, GaSe crystals serve as core elements for difference frequency generation (DFG) and optical parametric oscillation (OPO). Through nonlinear frequency conversion, near‑infrared pump lasers are efficiently converted into mid‑ and far‑infrared lasers in the 3–18 μm range, enabling high‑sensitivity detection of gas components at ppb (parts per billion) levels. This supports technological advances in air pollution monitoring, industrial process control, and explosive detection.
1.2Tunable Infrared Lasers​
Compatible with scientific‑grade infrared laser systems: as an OPO crystal, GaSe enables broadband tunable infrared laser output, meeting the needs of fundamental scientific research and materials analysis. Its wide transmission range and high nonlinear coefficient provide excellent frequency conversion efficiency for infrared laser systems.

Spectroscopy and Sensing​

2.1High‑Resolution Infrared Spectroscopy​
Integrated into Fourier transform infrared (FTIR) spectrometers and laser spectrometers: leveraging its high infrared transmittance and nonlinear properties to enhance detection of molecular fingerprint signals, useful for studying chemical reaction processes and characterizing new materials.
2.2Industrial Process and Safety Monitoring​
Used in industrial process gas analysis and safety monitoring systems: specific wavelength infrared lasers generated by GaSe crystals enable real‑time online monitoring of critical gas components during industrial production, as well as early warning of hazardous chemical leaks.

Scientific Research and Medical Fields​

3.1Cutting‑Edge Scientific Research​
Provides key material support for fundamental research such as nonlinear optics and quantum optics experiments. Its high nonlinear optical coefficient and broad transmission range are applied in optical parametric amplification, entangled photon pair generation, and other frontier experimental studies.
3.2Medical Diagnosis and Therapy​

In healthcare, GaSe is being explored for infrared optical coherence tomography (OCT) and photothermal therapy. Its high infrared transmittance makes it potentially suitable for deep tissue imaging and minimally invasive treatment devices. 

I am interested in GaSe
Submit