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ktp crystal
ktp crystal

KTP Laser Nonlinear Crystals

KTP (KTiOPO4) is an excellent non-linear crystal. It exhibits high optical quality, broad transparent range, relatively effective SHG coefficient (about 3 times higher than that of KDP), very high optical damage threshold, wide acceptance angle, small walk-off, and typeⅠand typeⅡnon-critical phase-matching (NCPM) in a wide wavelength range.

Applications of KTP Laser Nonlinear Crystals


  • Frequency Doubling (SHG) of Nd-doped Lasers for Green/Red Output

  • Frequency Mixing (SFM) of Nd Laser and Diode Laser for Blue Output

  • Parametric Sources (OPG, OPA and OPO) for 600nm - 4500nm Tunable Ouptut

  • E-O Modulators, Optical Switches, Directional Couplers;

  • Optical Waveguides for Integrated NLO and E-O DevicesOPA and OPO.


Advantages of KTP Laser Nonlinear Crystals


  • Large nonlinear optical coefficient;

  • Wide angular bandwidth and small walk-off angle

  • Broad temperature and spectral bandwidth;

  • High Electro-Optics(E-O) coefficient and low dielectric constant;

  • Non-hygroscopic, chemically and mechanically stable


Specifications of KTP Laser Nonlinear Crystals


Tolerance of cutting angle

△θ≤±0.25°,△φ≤±0.25°

Tolerance of dimension

Dimension+0/-0.1 mm,L:±0.1mm

Flatness

λ/10 @ 632.8nm

Wavefront distortion

λ/8@ 632.8nm

Surface quality

10/5 per MIL-O-13830A

Parallelism

20″

Perpendicularity

5′

Clear Aperture:

> 90%

Chamfer:

< 0.1 mm @ 45°

Size

Upon customer request

Coating

AR/HR coating upon customer’s request

Damage Threshold

750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period

One year under proper use


Optical and Nonlinear Properties of KTP Crystal of KTP Laser Nonlinear Crystals


Transparency Range

350~4500nm

SHG Phase Matchable Range

497 ~ 1800nm (Type II)

Therm-optic Coefficient (/℃, λ in μm)

dnx/dT=1.1X10^-5
dny/dT=1.3X10^-5
dnz/dT=1.6X10^-5

Absorption Coefficients

<0.1%/cm at 1064nm <1%/cm at 532nm

Angle Acceptance

14.2mrad·cm (φ);55.3mrad·cm (θ) for Type II SHG of a Nd:YAG laser at 1064nm

Temperature Acceptance

24°C·cm for Type II SHG of a Nd:YAG laser at 1064nm

Spectral Acceptance

0.56nm·cm for Type II SHG of a Nd:YAG laser at 1064nm

Walk-off Angle

0.55° for Type II SHG of a Nd:YAG laser at 1064nm

NLO Coefficients

deff(II)≈(d24 - d15)sin2Φsin2θ - (d15sin2Φ + d24cos2Φ)sinθ

Non-vanished NLO susceptibilities

d31=6.5 pm/V d24=7.6 pm/V
d32= 5 pm/V d15=6.1 pm/V
d33=13.7 pm/V

Sellmeier Equations (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

Electro-optic Coefficients:

r13

r23

r33

r51

r42

Low and High frequency (pm/V)

9.5 and 8.8

15.7and 13.8

36.3 and 35

7.3 and 6.9

9.3 and 8.8

Relative Dielectric Constant

εeff=13


Physical Properties of KTP Laser Nonlinear Crystals


Crystal Structure

Orthorhombic, space group Pna21,point group mm2

Lattice Parameter

a=6.404Å, b=10.616Å, c=12.814A, Z=8

Melting Point

About 1172°C

Mohs Hardness

5

Density

3.01 g/cm3

Refractive indices

nX = 1,7404; nY = 1,7479; nZ = 1,8296 @1064 nm

Thermal Conductivity

13W/m/K

Thermal Expansion Coefficients

ax=11x10^-6/℃, ay=9x10^-6/℃, az=0.6x10^-6/℃


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Head Office: No. 66, 8 Group, Chengbei Village, Yanguan Town, Jiaxing 314411, China;

Hangzhou Branch: Room 1012, Chunhua Bussiness Center, No. 159, Hangbo Street, Shangcheng District, Hangzhou 310009, Zhejiang, China
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