Electromagnetic wave generating device
First Claim
1. An electromagnetic wave generator comprising:
- a first pump beam emitter configured to emit a first pump beam having a wavelength larger than one micrometer;
a second pump beam emitter configured to emit a wavelength-tunable second pump beam having a wavelength larger than one micrometer, the wavelength of which is different from the wavelength of the first pump beam;
a nonlinear optical crystal configured to generate an electromagnetic wave of a difference frequency between the first and second pump beams; and
an optical system configured to irradiate the first and second pump beams to the nonlinear optical crystal, by adjusting an external intersection angle between the first and second pump beams within 0.5°
at the difference frequency of 1 THz, wherein a frequency-tunable terahertz electromagnetic wave is generated in the nonlinear optical crystal, by changing the frequency of the second pump beam, being liked with the change of the external intersection angle.
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Accused Products
Abstract
An electromagnetic wave generator encompasses a first pump beam emitter (2) configured to emit a first pump beam (hv1) having a wavelength larger than one micrometer; a second pump beam emitter (25) configured to emit a wavelength-tunable second pump beam (hv2) having a wavelength larger than one micrometer, the wavelength of which is different from the wavelength of the first pump beam (hv1); a nonlinear optical crystal (19) configured to generate an electromagnetic wave (hv3) of a difference frequency between the first pump beam (hv1) and second pump beam (hv2); and an optical system (M1, M2, 18) configured to irradiate the first pump beam (hv1) and second pump beam (hv2) to the nonlinear optical crystal (19), by adjusting an external intersection angle between the first pump beam (hv1) and second pump beam (hv2) within 0.5° at the difference frequency of 1 THz. Here, a frequency-tunable terahertz electromagnetic wave (hv3) is generated in the nonlinear optical crystal (19), by changing the frequency of the second pump beam (hv2), being liked with the change of the external intersection angle.
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Citations
20 Claims
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1. An electromagnetic wave generator comprising:
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a first pump beam emitter configured to emit a first pump beam having a wavelength larger than one micrometer;
a second pump beam emitter configured to emit a wavelength-tunable second pump beam having a wavelength larger than one micrometer, the wavelength of which is different from the wavelength of the first pump beam;
a nonlinear optical crystal configured to generate an electromagnetic wave of a difference frequency between the first and second pump beams; and
an optical system configured to irradiate the first and second pump beams to the nonlinear optical crystal, by adjusting an external intersection angle between the first and second pump beams within 0.5°
at the difference frequency of 1 THz,wherein a frequency-tunable terahertz electromagnetic wave is generated in the nonlinear optical crystal, by changing the frequency of the second pump beam, being liked with the change of the external intersection angle. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electromagnetic wave generator comprising:
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a first pump beam emitter configured to emit a first pump beam;
a second pump beam emitter configured to emit a wavelength-tunable second pump beam, the wavelength of which is different from the wavelength of the first pump beam; and
a nonlinear optical crystal configured to generate an electromagnetic wave of a difference frequency between the first and second pump beams, wherein a frequency-tunable terahertz electromagnetic wave is generated in the nonlinear optical crystal, by changing the frequency of the second pump beam. - View Dependent Claims (8, 9)
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10. An electromagnetic wave generator comprising:
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a first pump beam emitter configured to emit a first pump beam;
a second pump beam emitter configured to emit a wavelength-tunable second pump beam, the wavelength of which is different from the wavelength of the first pump beam;
a nonlinear optical crystal configured to generate an electromagnetic wave of a difference frequency between the first and second pump beams;
an optical system configured to irradiate the first and second pump beams to the nonlinear optical crystal, by adjusting an external intersection angle between the first and second pump beams; and
a timing control mechanism configured to control arrival timing of pulses of the first and second pump beams to the nonlinear optical crystal, wherein a frequency-tunable terahertz electromagnetic wave is generated in the nonlinear optical crystal, by changing the frequency of the second pump beam, being liked with the change of the external intersection angle. - View Dependent Claims (11, 12, 13, 14)
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15. An electromagnetic wave generator comprising:
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a first pump beam emitter configured to emit a first pump beam;
a second pump beam emitter configured to emit a wavelength-tunable second pump beam, the wavelength of which is different from the wavelength of the first pump beam;
a nonlinear optical crystal configured to generate an electromagnetic wave of a difference frequency between the first and second pump beams, and to emit the electromagnetic wave from an electromagnetic wave exit face;
an optical system configured to irradiate the first and second pump beams to the nonlinear optical crystal, by adjusting an external intersection angle between the first and second pump beams; and
an angle control mechanism configured to control an angle of the electromagnetic wave exit face against an optical axis of the first pump beam, wherein a frequency-tunable terahertz electromagnetic wave is emitted from the electromagnetic wave exit face, by changing the frequency of the second pump beam, being liked with the change of the external intersection angle and the change of the angle of the electromagnetic wave exit face. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification