| 摘要 |
PROBLEM TO BE SOLVED: To obtain a large frequency conversion width with high accuracy by performing the frequency conversion of a light signal in the light frequency conversion width in terahertz units and converting the converted light frequency in the light frequency conversion in megahertz units. SOLUTION: A frequency converting part 1 performing the frequency conversion of the light signal in the light frequency conversion width in terahertz units and a wavelength plate rotary type frequency converter 2 converting the light frequency converted in the frequency converting part 1 in the light frequency conversion width in megahertz units are provided. Then, the light frequency conversion having the largeness (being >= several Å in a wavelength) of no less than several terahertz by inputting the light signal becoming the object of the light frequency modulation to the frequency converting part 1 of a four light mixing system or in which a wavelength converting laser is applied. Next, the signal subjected to the frequency conversion in the frequency converting part 1, etc., are inputted to the wavelength plate rotary system light frequency converter 2 applied with a wavelength plate rotary system. Thus, a frequency conversion whose conversion width are several terahertz is performed with high accuracy. |
