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Updated: May 21, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Saturation spectroscopy of CO2 and frequency stabilization of an optical parametric oscillator at 2.77 μm
Hsuan-Chen Chen1, Chung-Yun Hsiao, Wei-Jo Ting
1Institute of Photonic Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan. d9666502@oz.nthu.edu.tw
Abstract:
We report the frequency stabilization of a CW single-frequency, singly resonant optical parametric oscillator (OPO) to the saturation absorption center of the (12)C(16)O2[10°1,02°1](II)>←00°0 P(14) line at 2.77 μm. The CO2 molecules were excited by the OPO idler wave, and the absorption signal was monitored through the fluorescence at 4.3 μm using a gold-coated longitudinal cell. The idler frequency was stabilized onto the line center by wavelength modulation method. The linewidth of the saturation dip was estimated to be 4.7 MHz, and the achieved frequency stability was 3.9 kHz (3.6×10(-11)).
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