公开(公告)号：US09705277B2

公开(公告)日：2017-07-11

申请号：US15158124

申请日：2016-05-18

Applicant: Lakehead University

Inventor： Gautam Das

IPC: G01J4/00 ,  G01N21/39 ,  H01S3/067 ,  H01S3/10 ,  H01S3/11 ,  H01S3/094 ,  G01J3/10 ,  G01J3/02 ,  G01J3/42 ,  H01S3/16 ,  G01N33/00

CPC classification number: H01S3/06791 ,  G01J3/0218 ,  G01J3/0224 ,  G01J3/10 ,  G01J3/42 ,  G01N21/39 ,  G01N33/0037 ,  G01N2021/391 ,  G01N2021/396 ,  G01N2201/06113 ,  G01N2201/08 ,  H01S3/06712 ,  H01S3/0675 ,  H01S3/094088 ,  H01S3/10061 ,  H01S3/1115 ,  H01S3/1608 ,  Y02A50/245

Abstract: A gas detection system uses intracavity fiber laser absorption spectroscopy. The fiber laser is stabilized by a saturable absorber, and the sensitivity is enhanced by multiple circulations of amplified spontaneous emission light under threshold conditions, and multi-longitudinal mode oscillation of the laser.

公开(公告)号：US20170025812A1

公开(公告)日：2017-01-26

申请号：US15158124

申请日：2016-05-18

Applicant: Lakehead University

Inventor： Gautam Das

IPC: H01S3/067 ,  H01S3/11 ,  G01J3/02 ,  H01S3/16 ,  G01N21/39 ,  G01J3/10 ,  H01S3/10 ,  H01S3/094

CPC classification number: H01S3/06791 ,  G01J3/0218 ,  G01J3/0224 ,  G01J3/10 ,  G01J3/42 ,  G01N21/39 ,  G01N33/0037 ,  G01N2021/391 ,  G01N2021/396 ,  G01N2201/06113 ,  G01N2201/08 ,  H01S3/06712 ,  H01S3/0675 ,  H01S3/094088 ,  H01S3/10061 ,  H01S3/1115 ,  H01S3/1608 ,  Y02A50/245

Abstract: A gas detection system uses intracavity fiber laser absorption spectroscopy. The fiber laser is stabilized by a saturable absorber, and the sensitivity is enhanced by multiple circulations of amplified spontaneous emission light under threshold conditions, and multi-longitudinal mode oscillation of the laser.

Abstract translation: 气体检测系统采用腔内光纤激光吸收光谱。 光纤激光器由可饱和吸收器稳定，灵敏度通过在阈值条件下放大的自发发射光的多次循环以及激光器的多纵模振荡来增强。

公开(公告)号：US10288558B2

公开(公告)日：2019-05-14

申请号：US15467361

申请日：2017-03-23

Applicant: Lakehead University

Inventor： Gautam Das

IPC: G01N21/3504 ,  G02B6/02 ,  G01N21/39 ,  G02B6/42 ,  G01N21/359 ,  F16L15/00

Abstract: Unique gas cell constructions based on a hollow-core photonic crystal fiber are used, for example, inside a fiber ring laser cavity as an intracavity gas cell. In one embodiment, two simple terminal blocks are coupled to opposite ends of the hollow-core photonic crystal fiber. Each block features a main through-bore with an optical window at one end and an optical fiber chuck fitted at the other end, while a transverse bore intersects the main bore and features a gas fitting for connection to a gas source or vacuum pump. In another embodiment, the hollow-core photonic crystal fiber is contained within an enclosure whose exterior walls are fitted with optical windows and gas ports. Inside the enclosure, fiber clamps supports the ends of the hollow-core photonic crystal fiber at positions adjacent to an in alignment with the optical windows.

公开(公告)号：US20180275048A1

公开(公告)日：2018-09-27

申请号：US15467361

申请日：2017-03-23

Applicant: Lakehead University

Inventor： Gautam Das

IPC: G01N21/3504 ,  G01N21/359 ,  G02B6/02

CPC classification number: G01N21/3504 ,  F16L15/008 ,  G01N21/359 ,  G01N21/39 ,  G01N2021/391 ,  G01N2201/088 ,  G02B6/02076 ,  G02B6/02328 ,  G02B6/4248

Abstract: Unique gas cell constructions based on a hollow-core photonic crystal fiber are used, for example, inside a fiber ring laser cavity as an intracavity gas cell. In one embodiment, two simple terminal blocks are coupled to opposite ends of the hollow-core photonic crystal fiber. Each block features a main through-bore with an optical window at one end and an optical fiber chuck fitted at the other end, while a transverse bore intersects the main bore and features a gas fitting for connection to a gas source or vacuum pump. In another embodiment, the hollow-core photonic crystal fiber is contained within an enclosure whose exterior walls are fitted with optical windows and gas ports. Inside the enclosure, fiber clamps supports the ends of the hollow-core photonic crystal fiber at positions adjacent to an in alignment with the optical windows.