TERAHERTZ WAVE GENERATOR

Pumping beam L1 is caused to be incident on an end surface 4A of a nonlinear crystal 4, and seed beam L2 the diameter of which is increased by a concave lens 6 is collected and adjusted into a collimated beam by a convex lens 7 and is caused to be incident on the end surface 4A described above. As d...

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Bibliographische Detailangaben
Hauptverfasser:	SASAKI, Motoi, NAKA, Toshiaki, TSUCHIYA, Akito
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	Pumping beam L1 is caused to be incident on an end surface 4A of a nonlinear crystal 4, and seed beam L2 the diameter of which is increased by a concave lens 6 is collected and adjusted into a collimated beam by a convex lens 7 and is caused to be incident on the end surface 4A described above. As described above, the pumping beam L1 and the seed beam L2 are caused to be incident on the end surface 4A with the pumping beam L1 and the seed beam L2 superimposed on each other, whereby the nonlinear crystal 4 generates terahertz wave TH. Since the diameter of the seed beam L2 described above is increased by the concave lens 6, the diameter of the seed beam L2 incident on the end surface 4A can be greater than the diameter of the seed beam generated by a terahertz wave generator of related art shown in FIG. 3. The area where the pumping beam L1 and the seed beam L2 incident on the end surface 4A are superimposed on each other can be greater than the area in the terahertz wave generator of related art. Since the area where the seed beam L2 and the pumping beam L1 are superimposed on each other on the end surface 4A can be greater than ever, the intensity of the terahertz wave TH generated by the nonlinear crystal 4 can be increased.