公开(公告)号：US20180375282A1

公开(公告)日：2018-12-27

申请号：US16052621

申请日：2018-08-02

Applicant: Shenzhen University

Inventor： Peiguang YAN ,  Hao CHEN ,  Fengfei XING ,  Jinfei DING

IPC: H01S3/11 ,  H01S3/067 ,  H01S3/094

Abstract: A two-dimensional semiconductor saturable absorber mirror comprises an optical fiber, a two-dimensional semiconductor thin film attached to an end surface of the optical fiber, and a gold film attached to the two-dimensional semiconductor thin film. A method for fabricating the two-dimensional semiconductor saturable absorber mirror comprises the following steps: cutting the optical fiber, putting the cut optical fiber and a two-dimensional semiconductor target into a vacuum chamber, ionizing a surface of two-dimensional semiconductor target to generate two-dimensional semiconductor plasma, depositing the two-dimensional semiconductor plasma on an exposed end surface of the optical fiber to form the two-dimensional semiconductor thin film, and by controlling deposition time and/or deposition temperature, ensuring the two-dimensional semiconductor thin film to be a desired thickness; and plating the gold film on the resulting two-dimensional semi-conductor thin film.

公开(公告)号：US20190204213A1

公开(公告)日：2019-07-04

申请号：US16353084

申请日：2019-03-14

Applicant: SHENZHEN UNIVERSITY

Inventor： Peiguang YAN ,  Hao CHEN ,  Fengfei XING ,  Min ZHANG

IPC: G01N21/31 ,  H01S3/067 ,  H01S3/094 ,  H01S3/115 ,  H01S3/102

CPC classification number: G01N21/31 ,  G01N21/39 ,  G01N33/1826 ,  H01S3/06791 ,  H01S3/094003 ,  H01S3/1028 ,  H01S3/115

Abstract: The present disclosure provides an apparatus and a method for measuring a concentration of pollutants in water. A passive Q-switched fiber laser outputs an evanescent wave to a to-be-tested water sample after emitting a Q-switched pulse laser signal and transmitting it via an evanescent field fiber, and based on an evanescent wave change caused by an absorption effect of the pollutants in the to-be-tested water sample to the evanescent wave and an output repetition frequency change of the passive Q-switched fiber laser due to the evanescent wave change, outputs an output repetition frequency result of the passive Q-switched fiber laser. The method is simple; and the apparatus based on the method is simple in structure and low in cost.