公开(公告)号：US20230357072A1

公开(公告)日：2023-11-09

申请号：US17777431

申请日：2021-04-21

Applicant: KOREA PHOTONICS TECHNOLOGY INSTITUTE

Inventor： Ju Hyeon CHOI ,  Jeong Hwan IN ,  Seon Hoon KIM

IPC: C03C3/12 ,  C03C4/10

CPC classification number: C03C3/122 ,  C03C4/10

Abstract: A composition for mid-infrared light transmitting glass and a method for preparing same are disclosed. Provided according to an embodiment of the present invention are a composition for mid-infrared light transmitting glass and a method for preparing same, wherein the composition can be manufactured into a lens that has both excellent optical properties and physical properties.

公开(公告)号：US20250146180A1

公开(公告)日：2025-05-08

申请号：US18916982

申请日：2024-10-16

Applicant: Korea Photonics Technology Institute

Inventor： Seon Hoon KIM ,  Ju Hyeon CHOI ,  Doo Gun KIM ,  Jeong Hwan IN ,  Ka Ram HAN ,  So Young KIM ,  Won Bae SOHN ,  June Hyuk KANG ,  Jehwan HWANG

IPC: C30B33/02 ,  C30B15/00 ,  C30B29/30 ,  H10N30/04

Abstract: Disclosed is a post-treatment method of a piezoelectric oxide single crystal substrate for suppressing pyroelectric properties of the substrate, and a method for manufacturing a lithium tantalate single crystal substrate using the same. According to one aspect of the present disclosure, there is provided a post-treatment method of a piezoelectric oxide single crystal substrate, the method including: loading at least one reducing agent and the single crystal substrate into a treatment device; and performing reduction treatment by heat treating the substrate while maintaining the inside of the treatment device in a preset environment, wherein the preset environment means that heat treatment is performed at a temperature of 200° C. to 400° C. under normal pressure.

公开(公告)号：US20200002217A1

公开(公告)日：2020-01-02

申请号：US16465424

申请日：2018-05-21

Applicant: KOREA PHOTONICS TECHNOLOGY INSTITUTE

Inventor： Ju Hyeon CHOI ,  Jung Whan IN ,  June PARK ,  Eui Sam LEE

IPC: C03C3/247 ,  C03C13/04

Abstract: Disclosed is fluorophosphate glasses for an active device, the fluorophosphate glasses including: a metaphosphate composition including Mg(PO3)2 of about 20 mol % to about 60 mol %; a fluoride composition including BaF2 of about 20 mol % to about 60 mol % and CaF2 of about 0 mol % to about 40 mol %; and dopants including rare earth elements, in which there is an effect of increasing a carrier lifetime at a metastable state energy level that is stimulated-emitted due to an efficient energy transfer phenomenon by composition optimization of dopants (e.g. Er and Yb).

公开(公告)号：US20230401845A1

公开(公告)日：2023-12-14

申请号：US18235388

申请日：2023-08-18

Applicant: KOREA PHOTONICS TECHNOLOGY INSTITUTE

Inventor： Seon Hoon KIM ,  Doo Gun KIM ,  Young Ho SONG ,  Seung Heon HAN ,  Ju Hyeon CHOI ,  Jeong Hwan IN

IPC: G06V20/17 ,  G05D1/00 ,  G05D1/10 ,  G06V10/764 ,  G06V10/774 ,  G06V20/10 ,  G06V20/68

CPC classification number: G06V20/17 ,  G05D1/0094 ,  G05D1/101 ,  G06V10/764 ,  G06V10/774 ,  G06V20/188 ,  G06V20/68 ,  B64U10/13

Abstract: A fruit quantity measurement system includes an unmanned aerial vehicle configured to receive GPS information about a fruit tree region of a predetermined area and an RF signal transmitted from an RF transmitter installed for each fruit tree and provide fruit tree images captured using at least one image sensor while flying based on a predetermined flight plan over the fruit tree region, and a monitoring server configured to be connected to the unmanned aerial vehicle through a communication network to receive GPS information and an RF signal from the unmanned aerial vehicle, match and store location data for each fruit tree, analyze the fruit tree image, measure the number of fruits for each fruit tree, store fruit counting information, and provide the stored location data or fruit counting information for each fruit tree according to a request from a user terminal authorized in advance.

公开(公告)号：US20200002218A1

公开(公告)日：2020-01-02

申请号：US16465432

申请日：2018-05-19

Applicant: KOREA PHOTONICS TECHNOLOGY INSTITUTE

Inventor： Ju Hyeon CHOI ,  Jung Whan IN ,  Yeon HWANG ,  Young Bok KIM

IPC: C03C3/247 ,  C03C13/04 ,  C03C4/12

Abstract: The disclosed fluorophosphate glasses for an active device include: a metaphosphate composition including Al(PO3)3; a fluoride composition including BaF2 and SrF2; and a dopant composed of ErF3 and YbF3, and have thermal and mechanical properties to be able to be used as a glass base material for an active device (e.g., optical fiber laser), have a high emission cross-section characteristic, have a reinforced upconversion and downconversion emission characteristic, and have high sensitivity S in a cryogenic environment.