公开(公告)号：US20210108333A1

公开(公告)日：2021-04-15

申请号：US16464327

申请日：2017-11-30

Applicant: ELEMENT SIX TECHNOLOGIES LIMITED

Inventor： MATTHEW LEE MARKHAM ,  ANDREW MARK EDMONDS ,  HARPREET KAUR DHILLON ,  DAVID WILLIAM HARDEMAN

IPC: C30B29/04 ,  C30B29/68 ,  C30B25/20 ,  C30B33/12

Abstract: A single crystal CVD diamond material is disclosed, the material comprising a total nitrogen concentration of at least 3 ppm as measured by secondary ion mass spectrometry (SIMS); and a low optical birefringence such that in a sample of the single crystal CVD diamond material having an area of at least 1.3 mm×1.3 mm, and measured using a pixel size of area in a range 1×1 μm2 to 20×20 μm2, a maximum value of Δn[average] does not exceed 1.5×10−4, where Δn[average] is an average value of a difference between refractive index for light polarised parallel to slow and fast axes averaged over the sample thickness. A method of making the material is also disclosed.

公开(公告)号：US20210115590A1

公开(公告)日：2021-04-22

申请号：US16464351

申请日：2017-11-30

Applicant: ELEMENT SIX TECHNOLOGIES LIMITED

Inventor： DANIEL JAMES TWITCHEN ,  HARPREET KAUR DHILLON ,  RIZWAN UDDIN AHMAD KHAN

IPC: C30B29/04 ,  C30B25/18 ,  C30B25/20 ,  C30B33/04 ,  C30B33/12

Abstract: There is described a single crystal CVD diamond material comprising three orthogonal dimensions of at least 2 mm; one or more regions of low optical birefringence, indicative of low strain, such that in a sample of the single crystal CVD diamond material having a thickness in a range 0.5 mm to 1.0 mm and an area of greater than 1.3 mm×1.3 mm and measured using a pixel size of area in a range 1×1 μm2 to 20×20 μm2, a maximum value of Δn[average] does not exceed 1.5×10−4 for the one or more regions of low optical birefringence, where Δn[average] is an average value of a difference between refractive index for light polarised parallel to slow and fast axes averaged over the sample thickness; one or more regions of high optical birefringence, indicative of high strain, such that in said sample of the single crystal CVD diamond material and measured using said pixel size, Δn[average] is greater than 1.5×10−4 and less than 3×10−3; and is wherein every 1.3 mm×1.3 mm area of the sample of the single crystal CVD diamond material comprises at least one of said regions of high optical birefringence. There is also described a method of making the CVD diamond material.