Table 1 Performance of comparable cavity ring-down spectrometers operating near 4.5 μm

From: Author Correction: Mid-infrared supermirrors with finesse exceeding 400 000

Reference

α0 at 1 s (cm−1 Hz−1/2)

L (m)

α0 at 1 s for L = 10 cm (cm−1 Hz−1/2)

INO-CNR18

5.0 × 10−9

1

5.0 × 10-7

VTT19

2.1 × 10−9

0.4

3.4 × 10-8

Nagoya20

1.1 × 10−8

0.11

1.3 × 10-8

NIST21

2.6 × 10−11

1.5

5.9 × 10-9

LLNL15,22

1.2 × 10−10

0.67

5.3 × 10-9

This work

6.0 × 10−11

0.79

3.7 × 10-9

  1. Here the absorption coefficient at 1 s integration, cavity length, and normalized performance for each system are shown. The ultralow optical loss of our crystalline coatings yields the lowest normalized noise-equivalent absorption.
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