TY - JOUR
T1 - Continuous wave terahertz wave spectrometer based on diode laser pumping
T2 - Potential applications in high resolution spectroscopy
AU - Tanabe, Tadao
AU - Ragam, Srinivasa
AU - Oyama, Yutaka
N1 - Funding Information:
We thank Professor Dr. Jun-ich Nishizawa, Dr. Tetsuo Sasaki, and Dr. Kyosuke Saito for fruitful discussions. This work was partially supported by Global COE program “Materials Integration (International Centre of Education and Research), Tohoku University,” MEXT, Japan and Toyota Research Grant program.
PY - 2009
Y1 - 2009
N2 - We constructed a high resolution terahertz (THz) spectroscopic system with an automatic scanning control using a continuous wave (cw) THz wave generator based on difference frequency generation method by excitation of phonon-polariton mode in GaP. The pump and signals lasers were compact, tunable external cavity laser, and distributed feedback (DFB) lasers, respectively. The generated THz waves were tuned automatically by changing the temperature of the DFB laser using a system control. We present the water vapor transmission characteristics of the THz wave and also absorption spectrum of a white polyethylene in the frequency range of 1.97-2.45 THz. The spectroscopic measurements performed at an output power level of 2 nW, which was obtained with a 15-mm-long GaP crystal at 2 THz. The advantage of this cw THz spectrometer is wide frequency tuning range (0.7-4.42 THz) with an estimated linewidth of full width at quarter maximum <8 MHz and this system has a potential application in high resolution spectroscopy.
AB - We constructed a high resolution terahertz (THz) spectroscopic system with an automatic scanning control using a continuous wave (cw) THz wave generator based on difference frequency generation method by excitation of phonon-polariton mode in GaP. The pump and signals lasers were compact, tunable external cavity laser, and distributed feedback (DFB) lasers, respectively. The generated THz waves were tuned automatically by changing the temperature of the DFB laser using a system control. We present the water vapor transmission characteristics of the THz wave and also absorption spectrum of a white polyethylene in the frequency range of 1.97-2.45 THz. The spectroscopic measurements performed at an output power level of 2 nW, which was obtained with a 15-mm-long GaP crystal at 2 THz. The advantage of this cw THz spectrometer is wide frequency tuning range (0.7-4.42 THz) with an estimated linewidth of full width at quarter maximum <8 MHz and this system has a potential application in high resolution spectroscopy.
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U2 - 10.1063/1.3258202
DO - 10.1063/1.3258202
M3 - Article
C2 - 19947715
AN - SCOPUS:71749091636
SN - 0034-6748
VL - 80
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 11
M1 - 113105
ER -