Nonlinear optical material and methods of fabrication

Patent metadata

Field	Value
Publication number	US-10409138-B2
Application number	US-201916357640-A
Country	US
Kind code	B2
Filing date	Mar 19, 2019
Priority date	Apr 13, 2015
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

Disclosed is a nonlinear optical (NLO) material for use in deep-UV applications, and methods of fabrication thereof. The NLO is fabricated from a plurality of components according to the formula AqByCz and a crystallographic non-centrosymmetric (NCS) structure. The NLO material may be fabricated as a polycrystalline or a single crystal material. In an embodiment, the material may be according to a formula Ba3ZnB5PO14.

First claim

What is claimed is:

1. A method of fabricating a polycrystalline non-linear optical (NLO) material, the method comprising:
heating a vessel containing a plurality of components according to a protocol, wherein the protocol comprises at least two heating portions;
forming, subsequent to completing the protocol, a polycrystalline NLO material comprising a crystallographic non-centrosymmetric (NCS) structure having a second harmonic generation (SHG) coefficient at 1064 nm of from about 42 a.u. to about 110 a.u.,
wherein the plurality of components are according to a formula of Ba 3 ZnB 5 PO 14 .

2. The method of claim 1 further comprising grinding the plurality of components prior to heating the vessel or during the protocol, wherein a particle size of the NLO material is from 30 μm to about 130 μm.

3. The method of claim 1 , wherein a first portion of the protocol comprises heating the vessel from a first temperature to a second temperature for a first period of time, and a second portion of the protocol comprises heating the vessel from a third temperature to a fourth temperature for a second period time, wherein the third temperature is higher than the second temperature, and wherein the second period of time is greater than the first.

4. The method of claim 3 further comprising grinding, during the second portion, the plurality of components, wherein grinding the plurality of components comprises further reducing the particle size of at least some of the plurality of components at least once during the second portion of the protocol.

5. The method of claim 3 further comprising reducing the temperature of the vessel to about room temperature.

6. The method of claim 1 , wherein a first portion of the protocol comprises heating the vessel from 200° C. to 600° C. for from 15 hours to 20 hours.

7. The method of claim 6 , wherein a second portion of the protocol comprises heating the vessel from 700° C. to 1000° C. for from 48 hours to 96 hours.

8. The method of claim 1 , wherein a first portion of the protocol comprises holding the vessel from 800° C. to 1100° C. for from 15 hours to 25 hours.

9. The method of claim 8 , wherein a second portion of the protocol comprises cooling the vessel to below 700° C. at a rate from 0.5° C. to 3° C./h.

10. The method of claim 9 , wherein a third portion of the protocol comprises quenching the vessel to about room temperature.

11. The method of claim 1 further comprising grinding, during a first portion of the protocol, the plurality of components, wherein grinding the plurality of components comprises further reducing a particle size of at least some of the plurality of components at least once during the first portion of the protocol.

12. The method of claim 1 , wherein the polycrystalline NLO material comprises a pure-phase material.

13. A method of fabricating a polycrystalline non-linear optical (NLO) material, the method comprising:
heating a vessel containing a plurality of components according to a protocol, wherein the protocol comprises at least two heating portions;
forming, subsequent to completing the protocol, a polycrystalline NLO material comprising a crystallographic non-centrosymmetric (NCS) structure having a second harmonic generation (SHG) coefficient at 1064 nm of from about 42 a.u. to about 110 a.u.,

wherein the polycrystalline NLO material is a boratephosphate.

14. The method of claim 13 , wherein the polycrystalline NLO material is according to a formula AqByCz.

15. The method of claim 14 , wherein A comprises an alkali metal or an alkaline earth metal.

16. The method of claim 14 , wherein B comprises at least two of boron (B), carbon (C), or a transition metal.

17. The method of claim 14 , wherein q and y are each from about 1 to 10.

18. The method of claim 14 , wherein z is from 1 to 20.

19. The method of claim 13 , wherein a first portion of the protocol comprises heating the vessel from a first temperature to a second temperature for a first period of time, and a second portion of the protocol comprises heating the vessel from a third temperature to a fourth temperature for a second period time, wherein the third temperature is higher than the second temperature, and wherein the second period of time is greater than the first.

Assignees

• Univ Houston System

Inventors

• Halasyamani P Shiv
• Yu Hongwei

Classifications

• C30B29/10

  Inorganic compounds or compositions · CPC title

• G02F1/37

  for second-harmonic generation {(G02F1/3532 takes precedence)} · CPC title

• C30B11/00

  Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method (C30B13/00, C30B15/00, C30B17/00, C30B19/00 take precedence; under a protective fluid C30B27/00) · CPC title

• G02F1/35

  Non-linear optics · CPC title

• C30B1/02

  by thermal treatment, e.g. strain annealing (C30B1/12 takes precedence) · CPC title