Accurate absolute reference frequencies from 1511 to 1545 nm of the ν1+ν3 band of ^12C2H2 determined with laser frequency comb interval measurements

Frequency comb-referenced measurements of self- and nitrogen-broadening in the ν1+ν3 band of acetylene

“…The measured width (HWHM) of the resonance is 105(2) kHz. Saturation dip sub-Doppler spectra of lines in this band of C 2 H 2 have previously been measured and used as secondary frequency standards [13]. Our measured frequency of 195 739.649 513 5(80) GHz is within the error limits of the published measurements [13] hence confirming the stability and accuracy of the new system.…”

“…Lamb dip experiments on acetylene reported here and previously [13] claim short term laser emission linewidths to be below 50 kHz. Fig.…”

Broadband and highly sensitive comb-assisted cavity ring down spectroscopy of CO near 1.57µm with sub-MHz frequency accuracy

“…Much work has thus been devoted to provide reference frequencies in the C-band (6390-6536 cm À 1 ) which is the most used band for optical fiber communication ( [4,5], and references therein). The P16 ν 1 þν 3 line position of 13 C 2 H 2 known with a 0.1 MHz standard uncertainty has been adopted by the Comité International des Poids et Mesures (CIPM), as a recognized reference for absolute optical frequency in the spectrum [6].…”

“…The P16 ν 1 þν 3 line position of 13 C 2 H 2 known with a 0.1 MHz standard uncertainty has been adopted by the Comité International des Poids et Mesures (CIPM), as a recognized reference for absolute optical frequency in the spectrum [6]. The 12 C 2 H 2 and 13 C 2 H 2 isotopologues of acetylene provide reference frequencies in the 1510-1550 nm (6450-6620 cm À 1 ) region [5,7]. These acetylene frequencies have been measured at a few kHz level using Doppler-free spectroscopic techniques, like saturation spectroscopy [5].…”

Sub-Doppler resolution near-infrared spectroscopy at 128 μm with the noise-immune cavity-enhanced optical heterodyne molecular spectroscopy method

“…Although it can be observed using highly sensitive techniques, such as cavity-ring down spectroscopy, most of the results are Doppler-limited. So far, the Doppler-free saturation spectrum in the 1.5 µm region has been successfully observed using cavitybased spectroscopy [6,7], but only the Doppler-limited spectrum has been reported in the 1.1 µm-1.3 µm band [8][9][10], which is with even smaller dipole moments .On the other hand, considerable progress in QD lasers engineering development results in the broad availability of efficient InGaAs QD diode applied for NIR laser sources. Particularly in the 1.1-1.3 µm band, QD diode based lasers have demonstrated their superior performances in several respects in comparison with traditional quantum-well based diode lasers [11].…”