ELECTROMAGNETIC WAVE GENERATING DEVICE

摘要

An electromagnetic wave generator encompasses a first pump beam emitter (2) configured to emit a first pump beam (hv 1 ) having a wavelength larger than one micrometer; a second pump beam emitter (25) configured to emit a wavelength-tunable second pump beam (hv 2 ) having a wavelength larger than one micrometer, the wavelength of which is different from the wavelength of the first pump beam (hv 1 ); a nonlinear optical crystal (19) configured to generate an electromagnetic wave (hv 3 ) of a difference frequency between the first pump beam (hv 1 ) and second pump beam (hv 2 ); and an optical system (M 1 , M 2 , 18) configured to irradiate the first pump beam (hv 1 ) and second pump beam (hv 2 ) to the nonlinear optical crystal (19), by adjusting an external intersection angle between the first pump beam (hv 1 ) and second pump beam (hv 2 ) within 0.5° at the difference frequency of 1 THz. Here, a frequency-tunable terahertz electromagnetic wave (hv 3 ) is generated in the nonlinear optical crystal (19), by changing the frequency of the second pump beam (hv 2 ), being liked with the change of the external intersection angle.