Blue light faraday rotation device

Patent metadata

Field	Value
Publication number	US-2019113388-A1
Application number	US-201816152015-A
Country	US
Kind code	A1
Filing date	Oct 4, 2018
Priority date	Oct 16, 2017
Publication date	Apr 18, 2019
Grant date	—

Abstract

A Faraday rotation device includes a light source configured to transmit a light beam; a first rotation stage polarizer configured to forward the light beam from the light source at a predetermined reference polarization angle; a quartz cell configured to receive the light beam from the first rotation stage polarizer at the predetermined reference polarization angle; one or more stacked ring permanent magnets coaxially fitted around the quartz cell; a stepper motor configured to adjust a rotational motion of a second rotation stage polarizer connected to the stepper motor, wherein the second rotation stage polarizer is configured to change a polarization angle of the light beam received from the quartz cell; a light detector; and an electronic circuit board configured to record a change in angle between the predetermined reference polarization angle and the changed polarization angle.

First claim

1 . A blue light Faraday rotation device, comprising:
a GaN-based blue light source configured to transmit a light beam; a first rotation stage polarizer configured to forward the light beam from the light source at a predetermined reference polarization angle; a cylindrical quartz cell configured to receive the light beam from the first rotation stage polarizer at the predetermined reference polarization angle, the cylindrical quartz cell including a first hole on a circular entrance of the cylindrical quartz cell and a second hole on a circular exit of the cylindrical quartz cell, the first hole and the second hole creating a tunnel within the cylindrical quartz cell structure and being connectable to a dry vacuum pump to evacuate air, and to flush and change a sample; one or more stacked ring permanent magnets coaxially and circumferentially fitted around the cylindrical quartz cell, the one or more stacked ring permanent magnets configured to create a magnetic field encircling the cylindrical quartz cell and rotate the light beam; a stepper motor configured to adjust a rotational motion of a second rotation stage polarizer connected to the stepper motor, wherein the second rotation stage polarizer is configured to change a polarization angle of the light beam received from the cylindrical quartz cell; a light detector configured to detect the rotated light beam; and an electronic circuit board configured with circuitry to control the light source, the light detector, and the stepper motor, and to record a change in angle between the predetermined reference polarization angle and the changed polarization angle.

2 . The Faraday rotation device of claim 1 , further comprising:
an iris diaphragm configured to collimate the light beam outputted from the light source.

3 . The Faraday rotation device of claim 1 , further comprising:
an aspheric lens configured to focus the light beam outputted from the light source.

4 - 5 . (canceled)

6 . The Faraday rotation device of claim 1 , wherein the light detector comprises a silicon photodiode.

7 . (canceled)

8 . The Faraday rotation device of claim 1 , wherein the stepper motor is a two-stage stepper motor.

9 - 17 . (canceled)

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Al-Basheer Watheq
• ABDELAZEM Sohaib

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V23/003

  the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array · CPC title

• G01J4/04 Primary

  Polarimeters using electric detection means (G01J4/02 takes precedence) · CPC title