Terahertz frequency shifter
A frequency shifter and terahertz technology, applied in the field of terahertz frequency shifters, can solve problems such as high cost, poor phase stability of terahertz waves, and large interference signal noise
Pending Publication Date: 2020-07-31
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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Problems solved by technology
[0004] In view of this, the embodiment of the present application is to provide a terahertz frequency shifter. To improve the existing terahertz interference, two sets of frequency doubling amplification links are required to realize it, resulting in poor phase stability of the two terahertz waves, thus The problem of making the interference signal noise larger and the cost higher
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[0029] The terahertz emission source is used to emit specified power, and the oscillation frequency is the first frequency (f 1 ) of the terahertz wave. In one embodiment, the terahertz emission source includes: a crystal oscillator, a first frequency multiplier, an amplifier, and a second frequency multiplier.
[0030] Wherein, the crystal oscillator is used to generate a radio frequency signal with a frequency of the third frequency, and transmit the video signal to the first frequency multiplier. For example, the frequency of the radio frequency signal generated by the crystal oscillator is 100MHz.
[0031] The first frequency multiplier is used to multiply the frequency of the radio frequency signal generated by the crystal oscillator at the third frequency to output at a fourth frequency, where the fourth frequency is N times the third frequency, and N is a positive integer greater than 2. For example, the frequency of the radio frequency signal output by the first freq...
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Abstract
The invention relates to a terahertz frequency shifter, and belongs to the technical field of terahertz. The terahertz frequency shifter comprises a terahertz emission source, a dynamic grating device, a beam splitter and laser equipment; the terahertz emission source is used for emitting terahertz waves of which the frequency is a first frequency; the beam splitter is used for reflecting part ofterahertz waves to the dynamic grating device; the laser equipment is used for generating two beams of laser with frequency difference, and the two beams of laser irradiate the dynamic grating deviceat a certain included angle and generate interference to form laser interference fringes; and the dynamic grating device is further used for generating photon-generated carriers which move synchronously with the laser interference fringes after being irradiated by the two beams of laser, the terahertz waves irradiated to the dynamic grating device are diffracted under modulation of the photon-generated carriers, and the terahertz waves with the second frequency are output. Terahertz waves are diffracted on the dynamic grating device by utilizing a dynamic grating diffraction technology, so that only one set of terahertz emission source is needed, and the terahertz waves can generate frequency offset.
Description
technical field [0001] The present application belongs to the technical field of terahertz, and in particular relates to a terahertz frequency shifter. Background technique [0002] Terahertz wave (THz wave) is an electromagnetic wave whose oscillation frequency is on the order of 0.1THz-10THz. Terahertz wave has the characteristics of good penetration to non-polar materials, high carrier frequency, and not easy to cause ionization damage. It has great application potential in military, public safety, high-speed communication, biological research and other fields. Terahertz wave technology has developed rapidly in recent years. Because terahertz waves have the characteristics and advantages of good penetration to non-polar materials, it is important to study the dynamic response of Doppler interferometry technology based on terahertz waves under material loading. Value. [0003] At present, in the field of terahertz wave interference, the more commonly used method is the t...
Claims
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IPC IPC(8): H01S1/00
CPCH01S1/00
Inventor 翟召辉朱礼国杜良辉彭其先
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS