Combined AM/FM laser radar transmitter
US4528669A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1983 |
| Grant date | Jul 9, 1985 |
| Priority date | — |
| Expiry date | Dec 15, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/107
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser radar transmitter (2) has, associated with a single active lasing region (11) and preferably in the same laser cavity (1) therewith, an amplitude modulator (21) and a frequency modulator (25), which may simultaneously place continuous AM and continuous FM on a single output beam (7). Amplitude modulator (21) is preferably an EO crystal having a high EO coefficient, low loss, and field-induced birefringence. Frequency modulator (25) is preferably an EO crystal having a high EO coefficient, low loss, and a field-induced index change. Applying a d.c. driving voltage to the AM crystal (21) and an a.c. driving voltage to the FM crystal (25) produces an output beam (7) having FM. Applying an a.c. driving voltage to the AM crystal (21) produces an output beam (7) having AM, independently of whether FM is added by means of applying an a.c. driving voltage to the FM crystal (25).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.