1. WASP: wideband spectrometer for heterodyne spectroscopy
2. We identify components and manufacturers to fully describe the instrument. Alternatives exist for many components and may be superior to the devices we chose; our identification is not a recommendation or endorsement.
3. Technical Research and Manufacturing Co., http://www.trm.com, models DMS 825 and DMS 225.
4. Agilent Technologies, http://www.agilent.com.
5. A precise four-quadrant multiplier with subnanosecond response