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1. (WO2018106321) LINEAR ABSORPTION SPECTROMETER TO OPTICALLY DETERMINE AN ABSOLUTE MOLE FRACTION OF RADIOCARBON IN A SAMPLE

Pub. No.:    WO/2018/106321    International Application No.:    PCT/US2017/053964
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Fri Sep 29 01:59:59 CEST 2017
IPC: G01J 3/28
G01J 5/02
G01J 5/06
G01J 5/08
Applicants: GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE
Inventors: FLEISHER, Adam J.
LONG, David A.
HODGES, Joseph T.
Title: LINEAR ABSORPTION SPECTROMETER TO OPTICALLY DETERMINE AN ABSOLUTE MOLE FRACTION OF RADIOCARBON IN A SAMPLE
Abstract:
A linear absorption spectrometer includes: a laser light source that provides mid-infrared laser light; a high finesse optical resonator that includes: a sample cell operating at a temperature from 220 K to 300 K during linear absorption of mid-infrared laser light by radiocarbon and including: a linear absorption optical path length greater than a kilometer; a first zero-pressure difference mirror mount on which a first supermirror is disposed; a second zero-pressure difference mirror mount on which a second supermirror is disposed; an optical switch interposed between the laser light source and the high finesse optical resonator that modulates and communicates mid-infrared laser light to the high finesse optical resonator; a photoreceiver that receives cavity ring down light and includes a noise equivalent power that is less than a shot noise limit of cavity ring down light.