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KTP

Potassium Titanyl Phosphate (KTiOPO4 or KTP) is an excellent nonlinear optical material suitable for use in many optical systems. It has high nonlinear coefficient and stable physical property. Its most popular application is as a frequency doubler utilizing the 1064nm output of a Nd:YAG laser and to generate 532nm laser. KTP’s properties also make it superior for electro-optic modulation, optical parametric generation. Keywords: KTP Crystal, Nonlinear Crystal, NLO Crystal

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Product Description

KTP is a positive biaxial crystal, with the principal axes X, Y, and Z (nz>ny>nx) parallel to the crystallographic axes a, b, and c, respectively.

ADVANTAGE:

● Large nonlinear coefficient

● Wide angular bandwidth and small walk off angle

● Broad temperature and spectral bandwidth

● Large electro-optical coefficient

● High damage threshold

● Nonhygroscopic, chemically and mechanically stable

Physical Properties:

Crystal structure	Orthorhombic, space group Pna21,point group mm²
Cell parameters	a=6.404Å, b=10.616Å, c=12.814Å, Z=8
Melting point	Around 1172℃
Mohs hardness	5
Density	3.01 g/cm³
Color	colorless
Hygroscopic susceptibility	no
Thermal conductivity	0.13 W/(cm*K^-1)
Thermo-optic Coefficient	dn_x/dT=1.1x10^-5/°C, dn_y/dT=1.3x10^-5/°C, dn_z/dT=1.6x10^-5/°C
Absorption coefficient	<0.1%/cm @ 1064nm, <1%/cm @ 532nm

Optical Properties:

Transmitting range:	350 nm - 4500 nm
SHG Phase Matchable Range	497～1800nm (Type II)
Refractive indices: 1064nm 532nm	n_x n_y n_z 1.7377 1.7453 1.8297 1.7780 1.7886 1.8887
Sellmeier equations: (λ in μm)	n_x²=3.0065+0.03901/(λ²-0.04251)-0.01327λ² n_y²=3.0333+0.04154/(λ²-0.04547)-0.01408λ² n_z²=3.3134+0.05694/(λ²-0.05658)-0.01682λ²
Nonlinear optical coefficients:	d₃₁=6.5pm/v, d₃₂=5pm/v, d₃₃=13.7pm/v, d₂₄=7.6pm/v, d₁₅=6.1pm/v
Effective nonlinearity expressions	d_eff(II)≈(d₂₄ - d₁₅)sin2Φsin2θ - (d₁₅sin²Φ + d₂₄cos²Φ)sinθ
For type II SHG of a Nd:YAG Laser at 1064nm:	Phase matching angle: θ=90°, φ=23.5° Temperature Acceptance: 24°C·cm Spectral Acceptance: 0.56nm·cm Angular Acceptance: 14.2mrad·cm (φ);55.3mrad·cm (θ) Walk-off Angle: 0.55°
Electro-optic coefficients:	Low frequency (pm/V) High frequency (pm/V)
r13	9.5	8.8
r23	15.7	13.8
r33	36.3	35.0
r51	7.3	6.9
r42	9.3	8.8
Dielectric constant:	ε_eff=13

APPLICATION:

Due to the unique combination of its properties – high nonlinear coefficient, high damage threshold, non-hygroscopic, KTP can be used in both commercial and military lasers including medical and laboratory systems, range finders, designators and systems for use in semiconductor industry.

Its application includes:

● SHG, SFG of Nd Lasers

● Optical Parametric Generation (OPG, OPA, OPO)

● Electro-Optical modulations

● Optical waveguide for integrated NLO and E-O devices

● SHG, SFG of Nd lasers

Optical Parametric Generation (OPG, OPA, OPO)

As an efficient OPO crystal pumped by the fundamental and second harmonics of a Nd:YAG or Nd:YLF laser, KTP plays an important role in parametric sources for tunable output from visible (0.6 um) to mid-IR (4.5 um). In NCPM KTP OPO pumped by 1064 nm, the signal output is around eye safe wavelength, finding applications in eye-safe devices. KTP's OPO pumped by a 1064 nm Nd-laser has generated above 66% conversion efficiency for conversion from 1064 to 2120 nm. The OPO/OPA in XY and YZ is seldom employed because of their low effective nonlinear coefficients and other limitation.

Below figure shows the non-critical phase-matched (NCPM) X-cut KTP OPO/OPA. For pumping wavelength range from 0.7μm to 1 μm, the output can cover from 1.04μm to 1.45μm(signal) and from 2.15μm to 3.2μm(idler). More than 45% conversion efficiency was obtained with narrow output bandwidth and good beam quality.

Electro-Optical Modulation

KTP also has promising E-O and dielectric properties that are comparable to LiNbO3. These properties make KTP extremely useful in various E-O devices.

Oven for Heating KTP crystals

Increasing the temperature of KTP crystal can enhance the damage threshold of KTP crystal. Therefore, for high power or high power density SHG of Nd lasers, heating KTP to a certain temperature (e.g. 80-100 deg) is recommended. CRYSTECH provides precision oven with temperature controller for heating KTP. A full assembly including KTP crystal, oven and temperature controller is also available.

After years of development, CRYSTECH has become the largest KTP manufacturer in the world.

CRYSTECH offers

● Strict quality control

● Large crystal size up to 20x20x40mm3 and maximum length of 60mm

● Quick delivery(3 weeks for polished only, 4 weeks for coated)

● Reasonable price and quantity discount

● Technical support

● AR-coating, re-polishing service.

Dimension Tolerance	W(+/-0.1)H(+/-0.1)L(+0.5/-0.1)mm
Angle Tolerance	+/-0.25°	Perpendicularity	≤10′
Scratch/Dig	20/10	Chamfer	≤0.2mmx45°
Parallelism	≤10″	Chips	≤0.1mm
Flatness	λ/10@633nm	Clear Aperture	≥90%
Wavefront distortion	λ/8@633nm
Coatings	C1---AR@1064(R<0.2%)&532(R<0.5%) C2---HR@1064(R>99.8%)&HT@532(T>95%) C3---AR@1064(R<0.2%)&1570(R<0.5%) C4---HR@1570(R>99.8%)&HT@1064(T>99.5%) C5---HR@1064(R>99.8%)&PR@1570(R=50,60,70%+/-2%)
Damage Threshold	500MW/cm² (1064nm, 10ns, 10Hz)

P/N	Type	Size(mm)	Coating
KTP.060603.C001	SHG	6x6x3	AR1064&532
KTP.060605.C001	SHG	6x6x5	AR1064&532
KTP.070705.C001	SHG	7x7x5	AR1064&532
KTP.080805.C005	SHG	8x8x5	AR1064&532
KTP.090905.C001	SHG	9x9x5	AR1064&532
KTP.151506.C003	SHG	15x15x6	AR1064&532
KTP.040420.C004	OPO	4x4x20	AR1570&1064
KTP.060620.C006	OPO	6x6x20	AR1570&1064
KTP.070720.C004	OPO	7x7x20	AR1570&1064
KTP.040416.C008	OPO	4x4x16	HR1570,HT1064\|HR1064,PR1570
KTP.050520.C009	OPO	5x5x20	HR1570,HT1064\|HR1064,PR1570

Key words:

ktp

shg

532nm

ktiopo3

potassium titanyl phosphate

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Established in 2001 and located in the city of Qingdao, China. Crystech Inc. is a global supplier of Alexandrite, KTP, RTP and E-O Q-Switch, YAG crystals, Laser Optics and more.

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