High-resolution high-speed terahertz spectrometer
US7605371B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2005 |
| Grant date | Oct 20, 2009 |
| Priority date | — |
| Expiry date | Dec 31, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3586
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The mode-locking frequencies of two femtosecond laser light sources are controlled so that they are stabilized at high degree and the difference between the mode-locking frequencies is constant. The output of the laser light sources are used as a pumping light for generating terahertz pulses and a probe pulse light for terahertz detection. Since the time delay timings of the terahertz pulses and the probe pulse light the pulse periods of which are slightly different from each other shift from each other and the difference increases. Therefore, the temporally expanded terahertz pulses are measured by high-speed sampling without using any mechanical stage for time delay scanning. The terahertz electric field time waveform measured by high-speed sampling with the measurement time window of the pulse period is subjected to time-scale conversion and Fourier transform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.