HIGH PRECISION MID-IR SPECTROSCOPY OF $\mathrm{^{12}C^{16}O_{2}}$ NEAR 4.3 $\mathrm{\mu m}$
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Date
2009
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Publisher
Ohio State University
Abstract
We have observed the sub-Doppler saturation spectrum of the $\mathrm{^{12}C^{16}O_{2}}$ near 4.3 $\mathrm{\mu m}$ using a mW-level DFG (Difference Frequency Generation) source. The DFG radiation is generated by a 1-W Ti:sapphire laser and a Nd:YAG laser amplified by 10-W fiber amplifier in a 50-mm long PPLN (Periodically Poled Lithium Niobate) crystal. We are able to generate 2 mW DFG power at 4.3 $\mathrm{\mu m}$. The Nd:YAG laser is frequency-doubled, and frequency stabilized on one $\mathrm{^{127}I_{2}}$ hyperfine transition. The Ti:sapphire laser is locked onto the center of $\mathrm{CO_{2}}$ transition and its frequency is measured by an OFC (Optical Frequency Comb). In this talk, we will report our recent measurements on the high J 0001 $\rightarrow$ 0000 fundamental band transitions and the hot band 0111 $\rightarrow$ 0110 transitions. To increase the signal-to-noise ratio of the observed spectra, the $\mathrm{CO_{2}}$ absorption cell in heated to a temperature $\mathrm{> 500^{irc}C}$.
Description
Author Institution: Dept. of Physics, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C; Inst. of Photonics Technologies, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C; Dept. of Physics, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C