Spectral data used in the paper "Mid-infrared laser heterodyne spectrometer by hollow optical fiber and its newly designed coupler"

////////// GENERAL INFORMATION ///////// 1. Title of Dataset: MIR hollow optical fiber coupler (HOPC) heterodyne spectral data 2. Authors: Hiromu Nakagawa, [e-mail] 3. Contact information: Hiromu Nakagawa, [e-mail] 4. Measurement dates: ///////////// FOLDER & FILE OVERVIEW ///////////// There are three data files for spectral data in Figures 6 and 7. (1) "MIR_HOPC_Heterodyne_spectral_data_QCL_Figure6.txt": The quantum cascade laser (QCL) emission spectral data in Figure 6: The first line is the intermediate frequency, the second line is the relative intensity of the QCL emission spectrum. (2) "MIR_HOPC_Heterodyne_tsys_Figure7_wFiber.txt" and "MIR_HOPC_Heterodyne_tsys_Figure7_woFiber.txt": The individual spectral data of system noise temperature in Figure 7. The first line is the intermediate frequency, the second and the third lines are the system noise temperature [K] of CO2 gas laser-based heterodyne spectrometer at 10.3 micron led through a hollow fiber (second) and led through in free space (third) in Figure 7. The file name of the individual spectrum includes "w" and "wo". "w" means the spectral data measured with fiber to led CO2 laser; while, "wo" means the spectral data measured without fiber (free space) to led CO2 laser. ///////////// POINT OF ATTENTION ///////////// The spectra were taken at the laboratory measurements in Tohoku University, Sendai, Japan. The data in this archive are relevant for the revised manuscript.