Development of a tunable terahertz (THz) radiation source using a MIM diode

In this research，we generated terahertz(far-infrared)radiation over 6 THz by mixing radiation from a i D115个D 1 NH I D 23个D 2laser and a CO I D 22个D 2laser in a metal-insulator-metal diode。A I D 115 I D 1 NH I D 23 I D 2 laser and a CO I D 22 I D 2 laser to pump it were designed and constructed.A feedback system for stabilization of a I D 115个D 1 NH I D 23个D 2 laser was also designed and made up.The I D115个D 1 NH I D 23个D 2 laser was locked to a saturated absorption signal from low pressure of I D 115个D 1 NH I D 23个D 2 gas，and its frequencies were measured by heterodyning the I D 115个D 1 NH I D 23个D 2 laser against CO I D 22个D 2 lasers.This I D 115个D 2 laser was combined with a CO I D 22个D 2 laser conuctpreed south.Generation of far-infrared radiation was confirmed by observing spectra of CH I D 23个D 2 OH which has rich torsion-rotation transitions over 6 THz.We succeeded in the observation of a spectrum at 9 THz。Using this far-infrared radiation，8 transitions of HF，H I D 135个D 1 C1，H I D 137个D 1 C 1 were observed in the 6 to 9 THz region.

In this research, we generated terahertz (far-infrared) radiation over 6 THz by mixing radiation from a ィイD115ィエD1 NHィイD23ィエD2 laser and a COィイD22ィエD2 laser in a metal-insulator-metal diode. A ィイD115ィエD1NHィイD23ィエD2 laser and a COィイD22ィエD2 laser to pump it were designed and constructed. A feedback system for stabilization of a ィイD115ィエD1NHィイD23ィエD2 laser was also designed and made up. The ィイD115ィエD1NHィイD23ィエD2 laser was locked to a saturated absorption signal from low pressure of ィイD115ィエD1NHィイD23ィエD2 gas, and its frequencies were measured by heterodyning the ィイD115ィエD1NHィイD23ィエD2 laser against COィイD22ィエD2 lasers.This ィイD115ィエD1NHィイD23ィエD2 laser was combined with a COィイD22ィエD2 laser constructed previously for difference frequency generation. Generation of far-infrared radiation was confirmed by observing spectra of CHィイD23ィエD2OH which has rich torsion-rotation transitions over 6 THz. We succeeded in the observation of a spectrum at 9 THz. Using this far-infrared radiation, 8 transitions of HF, HィイD135ィエD1C1, HィイD137ィエD1C1 were observed in the 6 to 9 THz region.