Heterodyne photomixer spectrometer with receiver photomixer driven at different frequency than source photomixer
| DWPI Title: Heterodyne photomixer spectrometer for use in terahertz spectroscopy, has receiver photomixer for receiving second laser beam and third laser beam, and detecting light transmitted reflected, or guided through sample |
| Abstract: A heterodyne photomixer spectrometer comprises a receiver photomixer that is driven at a different frequency than the source photomixer, thereby maintaining the coherent nature of the detection, eliminating etalon effects, and providing not only the amplitude but also the phase of the received signal. The heterodyne technique can be applied where the source and receiver elements are components of a waveguide thereby forming an on-chip heterodyne spectrometer. |
| Use: Heterodyne photomixer spectrometer for use in terahertz spectroscopy. |
| Advantage: Allows spectroscopic information to be obtained from the electromagnetic wave that is transmitted through the sample portion of the coplanar waveguide (CPW) and detected by the receiver. Maintains the coherent nature of the detection and detects both the amplitude and the phase of the received signal without the need to change the path length and take multiple scans since the receiver photomixer is driven at a different frequency than the source photomixer. |
| Novelty: The heterodyne photomixer spectrometer (10) has a first laser (11) generating a first laser beam (11'), a second laser (12) generating a second laser beam (12') at a frequency having a stable difference from the frequency of the first laser beam, and a third laser generating a third laser beam (13') swept in frequency. A source photomixer (14) receives the first laser beam and third laser beam and outputs light onto a sample (16). A receiver photomixer (15) receives the second laser beam and third laser beam and detects the light transmitted reflected or guided through the sample. |
| Filed: 9/28/2010 |
| Application Number: US2010892625A |
| Tech ID: SD 10896.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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