CRYLINK’s Ho: YLF crystal product, also known as holmium doped yttrium fluoride lithium crystal. It is a laser product with excellent comprehensive performance. It is widely used in industry, medical treatment, and scientific research. The product has the characteristics of a low nonlinear refractive index, low thermal, constant optical value, and long service life of 5I7 energy level. It can be used in remote sensing and pollutant monitoring solid laser products.

  • High emission cross-section
  • Long upper laser level lifetime
  • Naturally birefringent material
  • Efficient Q switch operation (up to 37 mJ per pulse)
  • The low value of dn/dT leads to a weak thermal lensing
  • The continuous wave output of the YLF laser can be up to 21W


a cut
Clear Aperture
Surface Tolerance+ 0/-0.1mm
Length Tolerance±0.1mm
Parallelism Error<10arcsec
Perpendicularity Error
<0.1mm @45˚
Surface Finish
10-5 S-D
<λ/10@632.8 nm
Double CoatedR<0.35%@1900-2100nm
Damage Threshold
>10J/cm2@2060nm, 10ns

Spectral and Thermomechanical Properties

Absorption peak wavelength1940nm
Absorption Cross-section at Peak1.2×10-20 cm2
Absorption Bandwidth at Peak Wavelength-18nm
Laser Wavelength2060nm
Lifetime of

5I7 Energy Level

Emission ross-section1.8×10-20 cm2
Refractive Index @1064 nmn0=1.448,ne=1.470
Crystal tructureTetragonal
Mohs Hardness5
Thermal Conductivity 6 Wm-1K-1
dn/dT-4.6×10-6 (||c) K-1,
-6.6×10-6 (||a) K-1
Thermal Expansion Coefficient10.1×10-6 (|c)K-1,
14.3×10-6 (||a)K-1
Typical Doping Level0.5-1%


Ho:YLF absorption emission curve-CRYLINK
Ho:YLF absorption emission curve


[1]2-μm wavelength, high-energy Ho:YLF chirped-pulse amplifier for mid-infrared OPCPA
[2]Compact fibre-laser-pumped Ho:YLF oscillator–amplifier system
[3]Overcoming bifurcation instability in high-repetition-rate Ho:YLF regenerative amplifiers

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