KT (KTaO3) Crystals

Processing example of KT crystal — Example of KT crystal processing (plate processing)

Overview

KT (KTaO ₃) crystal is a transparent oxide crystal consisting of potassium (K), tantalum (Ta), and oxygen (O). It has a cubic crystal structure and is optically transparent in the range of 365 nm to 4000 nm. It is a transparent crystal with no anisotropy.
It is a high refractive index optical crystal with a refractive index of 2.2 or more in the visible region, and is stable against heat and water.

feature

Chemically stable transparent oxide crystal
Oxide crystal transparent from around 365 nm to 4000 nm with no birefringence
High refractive index (n _d =2.24257)

application

As a lens material that takes advantage of its high refractive index and transparency
As a SIL material for next-generation DVDs (reference)
As an optical component material for lasers (e.g. Er:YAG) that utilizes high transparency and high optical damage threshold
As a NAIL (Numerical Aperture Increasing Lens) for microscopes

Examples of KT crystal processing

Please contact us if you have any requests for ball lenses, SIL, plate processing, etc.

Properties of KT crystal

Internal transmittance chromatic dispersion

Material Properties

Refractive Index: n_d = 2.24257 (@ 28 ℃)
Linear Coefficient of Thermal Expansion: -30 centigrade to +20 centigrade : 6.3 x 10^-6 / ℃
+20 centigrade to +70 centigrade : 6.7 x 10^-6 / ℃
Abbe's Number: ｖ_d = 17.3 (@ 28 ℃)
Wide optical window: 365 nm to 4000 nm
Good machinability: Weak cleavage habit : no chipping

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