GTR-KTP Crystal | Grey-Track Resistant Potassium Titanyl Phosphate ...

Data sheet

Materials	GTR-KTP Crystal

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GTR-KTP Crystal is an advanced version of the traditional KTP crystal, designed to overcome the grey-track phenomenon that limits the performance of standard KTP in high repetition rate and high-power laser systems. GTR-KTP crystals exhibit enhanced grey-track resistance, making them ideal for demanding applications. The grey-track phenomenon can be measured using a photothermal common-path interferometer, where the crystal shows increased absorption after exposure to continuous 532 nm green laser light. Heeger Materials provides high-quality GTR-KTP crystals, offering improved durability and efficiency for advanced laser applications.

GTR-KTP Crystal | Grey-Track Resistant Potassium Titanyl Phosphate Crystal

GTR-KTP Crystal Specifications

Dimension Tolerance	(W ± 0.1 mm) × (H ± 0.1 mm) × (L + 0.5/-0.1 mm) × (L≧2.5 mm)(W ± 0.1 mm) × (H ± 0.1 mm) × (L + 0.1/-0.1 mm) × (L＜2.5 mm)
Clear Aperture	Central 90% of the diameter
Internal Quality	No visible scattering paths or centers when inspected by a 50 mW green laser
Flatness	≦λ/8 @633 nm
Transmitted Wavefront Distortion	≦λ/8 @633 nm
Surface Quality (Scratch/Dig)	10/5 (Polished) to MIL-PRF-13830B 20/10 (AR-coated) to MIL-PRF-13830B 40/20 (HR-coated) to MIL-PRF-13830B
Parallelism	20 arcsec
Perpendicularity	≦15 arc min
Angle Tolerance	≦0.25 °
Chamfer	≦0.2 mm × 45 °
Chip	≦0.1 mm

KTP VS. GTR-KTP: Before Grey Tracking Test

For the same optical path length in crystal devices, the absorption value of GTR-KTP crystals at 1064 nm is only 1/10 of that of traditional KTP crystals, as shown in the figure below:

KTP VS. GTR-KTP: Gray Tracking Test

When a green light (400 mW, beam diameter 0.07 mm, power density 10 KW/cm²) passes through the crystal, the infrared absorption of the crystal increases due to the gray tracking phenomenon. The figure below shows the change in absorption values over time at 1064 nm for GTR-KTP crystals and traditional KTP crystals, respectively.

GTR-KTP VS. KTP Gray Tracking Test

KTP VS.GTR-KTP: After Grey Tracking Test

Bulk absorption measurements at 1064 nm after gray tracking testing

Bulk absorption measurements at 532 nm after gray tracking testing

GTR-KTP Crystal Transmittance Curves

GTR-KTP Crystal Transmittance Curve

GTR-KTP Crystal AR-Coating

Dual Band AR-coating (DBAR) of GTR-KTP for SHG of 1064 nm
low reflectance (R<0.2% @1064 nm and R<0.5% @532 nm)
High damage threshold (˃1 GW/cm2 @1064 nm, ˃300 MW/cm2 @532 nm, at 10 ns, 10 Hz), long durability.
High reflectivity coating: HR1064 nm & HT 532 nm, R˃99.8% @1064 nm, T˃95% @532 nm.
Broad Band AR-coating (BBAR) of GTR-KTP for OPO applications.
Other coatings are available upon request.

GTR-KTP Crystal Packing And Shipping

GTR-KTP Crystal will be securely packaged in sturdy containers with cushioning materials to prevent movement or damage during shipping. This careful packaging ensures that the product arrives in perfect condition, maintaining its high-quality standards throughout the delivery process.

GTR-KTP Crystal | Grey-Track Resistant Potassium Titanyl Phosphate Crystal Packing

Where to Buy GTR-KTP Crystal in Bulk?

Heeger Materials Inc., a professional supplier and manufacturer of high-quality Nonlinear Crystals products including GTR-KTP Crystal, leverages extensive expertise in supply and export to offer competitive prices. We provide customized solutions to meet specific requirements, ensuring exceptional quality and customer satisfaction.

Heeger Materials Inc. was established in 2016 in Colorado, USA. We specialize in premium-grade metals, alloys, ceramics, powders, and other materials catering to research, development, and large-scale industrial production in scientific and industrial sectors.

Nonlinear Crystal Stock Models

Nonlinear Crystal Type	BBO, ß-BaB₂O₄	KTP, KTiOPO₃	LBO, LiB₃O₅	BIBO, BiB₃O₆	CLBO, CsLiB₆O₁₀
Transmission Range (nm)	190-3500	350-4500	160-2600	286-2500	180-2750
SHG Phase-Matching Range (nm)	409.6-3500 (Type I) 25-3500 (Type II)	994-2000 (Type II)	551-2600 (Type I) 790-2150 (Type II)	574-2480	473-2750 (Type I) 636-2750 (Type II)
Effective Nonlinear Coefficient deff SHG 1064 nm [pm/V]	2.14 (Type I) 1.47 (Type II)	4.03 (Type II)	0.82 (Type I)	3.34	0.9 (Type I, 4HG) 1.19 (Type I, 5HG) 0.95 (Type II)
Absorption Coefficient [%/cm]	<0.1@1064nm <1@532nm	<0.1@1064nm <1@532nm	<0.1@1064nm <0.3@532nm	<0.1@1064nm	<0.03@1064nm <0.1@532nm
Acceptance Angle SHG 1064 nm [mrad/cm]	0.8 (Type I) 1.27 (Type II)	14.2 (φ) 55.3 (θ)	6.54 (Type I) 15.27 (Type II)	1.03 (ee-o)	0.45 (Type I, 4HG) 0.42 (Type I, 5HG) 1.90 (Type II)
Walk-off Angle SHG 1064 nm [mrad]	55.6 (Type I) 69.4 (Type II)	4.87 (Type II)	6.7 (Type I) 6.4 (Type II)	24.5 (Type I)	7.85 (Type I, 4HG) 7.33 (Type I, 5HG) 33.1 (Type II)
Acceptance Temperature SHG 1064 nm [°C/cm]	70	24	6.7 (Type I) 7.5 (Type II)	2.17	8.30 (Type I, 4HG) 4.60 (Type I, 5HG) 43.1 (Type II)
Acceptance Spectrum	1.1	0.56	1.0 (Type I) 1.3 (Type II)	0.96 (ee-o)	0.13 (Type I, 4HG) 0.16 (Type I, 5HG) 5.60 (Type II)

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