Abstract
Trace-level ammonia gas in air was
analyzed using a fiber-based
compact cavity ring-down spectrometer (CRDS). For the compact
spectrometer, a 20 cm linear cavity with two high reflectivity (
>
99.999
%
) mirrors was employed. The laser
frequency was locked to the cavity resonance by using frequency
shifted (160 MHz) optical feedback. For
N
H
3
detection, a strong absorption band
at 1513.98 nm with an absorption cross section of
3
.
3
⋅
1
0
−
21
c
m
/
m
o
l
e
c
u
l
e
was used. As a result, a detection
sensitivity of
∼
0.1
p
p
b
(
3
-
σ
) was achieved for
N
H
3
within 10 s.
Funder
Gwangju Institute of Science and
Technology
Ministry of SMEs and
Startups
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
2 articles.
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