KTP

 

KTP

 KTP (KTiOPO4) is a nonlinear optical crystal, which possesses excellent nonlinear and electro-optic properties.It has large nonlinear optical coefficients and wide angular bandwidth and small walk-off angle,etc.which make it suitable for various nonlinear frequency conversion and wave guide online_ordering.

Due to very high effective nonlinearity (d eff ~8.3xd 36 (KDP)at 1.06μ m) and excellent optical properties,KTP perfectly suits as lasing material in various online_orderings .The phase matching range of KTP crystal lies in 0.99-3.3 μ m region .This allows us to use KTP as an intracavity and extracavity frequency double for the most commonly used lasers,such as Nd:YAG,Nd:Glass and Nd:YLF 


Capabilities : 

1)
Aperture:1x1 ~ 10x10mm
2)
Length: 0.05 ~ 20mm
3)
Phase Matching Angle: 
Determined by different homonic generartion 
typical θ=90°; φ=23.5° for SHG 1064nm
4)
Phase matching type:Type II
5)
Typical Coating: 
a) AR @1064nm R<0.1%; AR @ 532nm, R<0.25%. (see Coating 18-1)
b) HR @1064nm, R>99.8%; HT @808nm, T<0.5% (see Coating 18-2)
Different coating specification upon customer request.

 

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Typical Specification and Tolerance:
1)
Angle tolerance: Δθ< ± 0.2°; Δφ< ±0.2°
2)
Dimension tolerance: (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)
3)
Flatness: λ/8 @ 633nm
4)
Scratch/Dig code: better than 10/5 Scracth/dig per MIL-O-13830A
5)
Parallelism: < 20 arc seconds
6)
Perpendicularity:< 5 arc minutes
7)
Wavefront distortion: < λ/8 @ 633nm
8)
Clear aperture: > 90% central area

 

Physical and Optical Properties

 

Crystal structure Orthorhombic, point group mm 2
Melting point 1172°C incongruent
Cell parameters a=6.404?, b=10.616?, c=12.814?, Z=8
Curie point 936°C
Mohs hardness ~5
Density 3.01 g/cm 3
Color colorless
Hygroscopic susceptibility no
Specific heat 0.1643 cal/g.°C
Thermal conductivity 0.13 W/cm/°K
Electrical conductivity 3.5x10 -8 s/cm (c-axis, 22°C, 1KHz)

 

Transmitting Range 350nm~4500nm
    nx ny nz
Refractive Indices 1064nm 1.7377 1.7453 1.8297
  532nm 1.7780 1.7886 1.8887
Absorption Coefficients α < 1% / cm @ 1.064 μm    
Phase Matchable Range 0.984-3.4μm      
Therm-Optic dnx / dT= 1.1x10  /°C,dny / dT= 1.3x10  /°C,dnz / dT=1.6x10  /°C
Coefficients        
Nonlinear d31=2.54pm/V,  d32=1.35pm/V,  d33=16.9pm/V
Optical Coefficients d24=3.64pm/V,  d15=1.91pm/V,  at 1.064μm
  deff(II)  (d24-d15)sin2Φsin2θ-(d10sin  Φ+d24cos  Φ)sinθ
    Low frequency High frequency
    (pm/V)   (pm/V)
Electro-Optic r13 9.5   8.8
Coefficients r23 15.7   13.8
  r33 36.3   35.0
  r51 7.3   6.9
  r42 9.3   8.8
Dielectric Constant εeff=13      
  n= 3.0065 + 0.03901/(λ - 0.04251) - 0.01327λ
Sellmeier Equations ny = 3.0333 + 0.04154/(λ - 0.04547) - 0.01408λ
  nz = 3.3134 + 0.05694/(λ - 0.05658) - 0.01682λ

 

Fig. 1 represents Type 2 SHG tuning curve of KTP in x-y plane. In x-y plane the slope d(Dk)/dq is small. This corresponds to quasi-angular noncritical phase matching, which ensures the double advantage of a large acceptance angle and a small walk of

 

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Fig. 2 represents Type 2 SHG tuning curve of KTP in x-z plane. in x-z plane the slope d(Dk)/dq is almost zero for wavelengths in the range 1.5-2.5 m m and this corresponds to quasi-wavelength noncritical phase matching, which ensures a large spectral acceptance. Wavelength noncritical phase matching is highly desirable for frequency conversion of short pulses.

Figures 3 and 4 show the phase matching angles for OPO/OPA pumped at 532 nm in x-y and x-z plane respectively. As a lasing material for OPG, OPA or OPO, KTP can most usefully be pumped by Nd lasers and their second harmonic or any other source with intermediate wavelength, such as a dye laser (near 600 nm).  

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Standard KTP for SHG of 1064nm

Part No.
Size (mm)

q

f
Coating
S1 S2
KTP001
3x3x5
90°
23.5°
AR@1064nm R<0.2% 
AR@532nm R<0.5%
AR@1064nm R<0.2% 
AR@532nm R<0.5%
KTP002
3x3x5
90°
23.5°
HR@1064nm R>99.8% 
AR@ 532nm R<0.5%
AR@1064nm R<0.2% 
AR@532nm R<0.5%
KTP003
3x3x10
90°
23.5°
HR@1064nm R>99.8% 
AR@ 532nm R<0.5%
AR@1064nm R<0.2% 
AR@532nm R<0.5%

 

Notes:

1.To inquiry or order a finished KTP crystals, please specify the specification listed above, we kindly request engineering drawing to specify orientation, Please consult us for the designs if you're sure about the phase matching angle for others' special online_ordering.
2.For information of handling and Mark of Mark of KTP. 

 

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