Abstract
We report on the implementation of a confocal microscopy system based on an injection-seeded terahertz parametric generator working at 1.76 THz. The system has a fairly reliable long-term stable operation with pulse energy fluctuations <5 % . We experimentally demonstrate a subwavelength lateral resolution of 158 μm, corresponding to 0.93λ. We also demonstrate the capability of resolving overlapping objects at the different longitudinal surfaces by imaging a designed sample. This is the first detailed demonstration of confocal microscopy based on a THz parametric source, which is helpful for the practical application of THz imaging technology.
Highlights
Terahertz (THz) confocal microscopy is very promising for THz nondestructive testing and industry quality inspection.[1,2,3,4,5] As THz waves can penetrate nonpolar and nonmetallic materials, confocal technology can enhance resolution and achieve optical sectioning.[6,7] Many efforts have been made in the field of THz confocal microscopy
We report on the implementation of a confocal microscopy system based on an injection-seeded terahertz parametric generator working at 1.76 THz
We demonstrate a THz confocal microscopy based on an is-TPG working at a frequency of 1.76 THz
Summary
Terahertz (THz) confocal microscopy is very promising for THz nondestructive testing and industry quality inspection.[1,2,3,4,5] As THz waves can penetrate nonpolar and nonmetallic materials, confocal technology can enhance resolution and achieve optical sectioning.[6,7] Many efforts have been made in the field of THz confocal microscopy. We report on the implementation of a confocal microscopy system based on an injection-seeded terahertz parametric generator working at 1.76 THz. The system has a fairly reliable long-term stable operation with pulse energy fluctuations
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