			15min:

HIGH PRECISION MID-IR SPECTROSCOPY OF ¹⁴N₂¹⁶O NEAR 4.5 µm.

WEI-JO TING, JOW-TSONG SHY, Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C.

The sub-Doppler saturation spectrum of the ¹⁴N₂¹⁶O near 4.5 µm is studied using a mW-level DFG (Difference Frequency Generation) source. The DFG radiation is generated by a Ti:sapphire laser and a Nd:YAG laser amplified by a 10-W fiber amplifier in a 45-mm long PPLN (Periodically-Poled Lithium Niobate) crystal. The Nd:YAG laser is frequency-doubled and frequency stabilized on one ¹²⁷I₂ hyperfine transition. The Ti:sapphire laser is locked onto the center of N₂O transition and its frequency is measured by an OFC (Optical Frequency Comb). In this talk, we will report our measurements of the fundamental band of N₂O near 4.5 µm.