Laser spectroscopic sensor using orbital angular momentum
AssigneeNEC Laboratories America, Inc.
InventorsTing Wang, Yi Weng
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Abstract
A method and system for optical angular momentum (OAM) spectroscopy includes generating a beam of light having a single OAM mode. A first spectrum of the beam of light is detected and the beam of light is passed through a gas to attenuate the beam of light in accordance with a presence and concentration of a respective gas. A second spectrum the beam of light is coherently detected and a difference between the first and second spectrum for the beam of light is analyzed to determine the presence and concentration of the respective gas.
Claims17
A method for optical angular momentum (OAM) spectroscopy, comprising:
- generating a beam of light having a single OAM mode;
- detecting a first spectrum of the beam of light;
- passing the beam of light through a gas to attenuate the beam of light in accordance with a presence and concentration of a respective gas;
- coherently detecting a second spectrum the beam of light;
- and
- analyzing a difference between the first and second spectrum for the beam of light to determine the presence and concentration of the respective gas.
An optical angular momentum (OAM) spectroscopy sensor, comprising:
- a laser;
- an OAM converter configured to impose an OAM mode on an output of the laser and produce an OAM beam;
- a first OAM receiver configured to detect a first spectrum of the OAM beam from the OAM converter;
- a gas cavity containing a mixture comprising one or more component gases configured to attenuate the OAM beam in accordance with a presence and concentration of a respective gas;
- a second OAM receiver configured to coherently detect a second spectrum of the OAM beam after the OAM beam has passed through the gas cavity;
- and
- a processor configured to analyze a difference between the first and second spectrum for the beam of light to determine the presence and concentration of the respective gas.
Dependencies are inferred from the claim text.