KT (_KTaO3) crystals

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)

KT crystal structure (cubic)

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

refractive index 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

*The contents of this website are subject to change without notice due to product improvements.