HGTR-KTP (Nonlinear Crystal)

HGTR-KTP (Nonlinear Crystal)

HGTR-KTP (Highly Gray Trace Resistant KTP) nonlinear crystal, the direct manifestation of gray trace is the appearance of black or gray damage traces inside the crystal.

In contrast, HGTR-KTP nonlinear crystal greatly reduces the Ti+3 ion center defect inside the crystal during laser frequency doubling. Its nonlinear optical coefficient, high thermal conductivity, small mismatch and small walking away angle, no deliquescence, and stable chemical and mechanical properties.

It is now widely used in Nd:YAG and Nd:YVO4 lasers with 1064-532 nm wavelengths as frequency-doubling crystal materials. In addition, it can also be used to make components for frequency doubling, frequency mixing, electro-optical modulation, optical parametric oscillation, and optical waveguide.

Features of HGTR-KTP Nonlinear Crystal:

  • No deliquescence
  • High optical quality
  • Low half-wave voltage
  • Large nonlinear coefficient
  • High anti ash track performance
  • High light damage threshold
  • Stable chemical and mechanical properties
  • Large range of allowable temperature matching and allowable angle matching

Physicochemical Properties

PropertyValue
Chemical Formula
HGTR-KTiOPO4
Crystal Structure
Rhombic system, space group Pna21, point group mm2
Lattice Constant
a=6.404Å
b=10.616Å
c=12.814Å
Z=8
Mohs Hardness
5
Density
3.01 g/cm3
Melting Point
1172°C
Thermal Conductivity
13 W/m/K
Thermal Coefficient of Expansion
ax=11x10-6/℃
ay=9x10-6/℃
az=0.6x10-6/℃

Nonlinear Optical Properties

SHG phase matching range497-1800nm (Type II)
Nonlinear Coefficient @1064nmdeff(II)≈(d24-d15)sin2φsin2θ-(d15sin2φ+d24cos2φ)sinθ
d31=2.54pm/V
d32=1.35pm/V
d33=16.9pm/V
d24=3.64pm/V
d15=1.91pm/V
Thermo-optical Coeffecient
dnx/dT=1.1*10-5/℃
dny/dT=1.3*10-5/℃
dnz/dT=1.6*10-5/℃
Damage Threshold: [GW/cm ]>0.5 @1064 nm,TEM00, 10ns,10HZ(AR-coated)
>0.3 @532 nm,TEM00, 10ns,10HZ(AR-coated)

Linear Optical Properties

Transparency range
350-4500 nm
Absorption Coefficient
<0.1%/cm @1064 nm
<1%/cm @532 nm
Refractive Index
nx=1.7377,
ny=1.7453,
nz=1.8297 @1064nm
nx=1.7780,
ny=1.7886,
nz=1.8887 @532nm
Sellmeier Equation (λ in μm)nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ2
ny2=3.0333+0.04154/(λ2-0.04547)-0.01408λ2
nz2=3.3134+0.05694/(λ2-0.05658)-0.01682λ2

Spectrum

Transmittance of nonlinear crystal HGTR-KTP -CRYLINKGray trace effect of nonlinear crystal HGTR-KTP -CRYLINK
Crystal HGTR-KTP transmittance curveComparison of HGTR-KTP with ordinary molten salt KTP and hydrothermal KTP

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