Optical pump beam control in a sensor system
US10416245B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 2016 |
| Grant date | Sep 17, 2019 |
| Priority date | — |
| Expiry date | May 31, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N24/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
One example includes a sensor system. A cell system includes a pump laser which generates a pump beam to polarize alkali metal vapor enclosed within a sensor cell. A detection system includes a probe laser to generate a probe beam. The detection system can calculate at least one measurable parameter based on characteristics of the probe beam passing through the sensor cell resulting from precession of the polarized alkali metal vapor in response to an applied magnetic field. A pump beam control system pulse-width modulates a frequency of the pump beam to provide a pulse-width modulated (PWM) pump beam, and controls a duty-cycle of the PWM pump beam based on the characteristics of the probe beam passing through the sensor cell in a feedback manner to control polarization uniformity of the alkali metal vapor and to mitigate the effects of AC Stark shift on the at least one measurable parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.