Linear FM chirp laser
The method is described of operating a laser radar system comprising: actuating a transmitter laser and a local oscillator laser to emit laser light at approximately a preselected common base frequency; frequency modulating the light of the transmitter laser in linear chirps by passing it through an electro-optical crystal disposed within the cavity of the transmitter and driving crystal with a linear chirp drive signal from a precision linear driver; sensing a portion of the laser light from the transmitter laser and the local oscillator laser to determine the base frequency thereof and adjusting the piezoelectric translators of the two lasers as a function of the sensed portion to maintain the lasers emitting at exactly the preselected base frequency; and using the balance of the light from the transmitter laser as the transmitted laser beam.
- Assignee:
- Hughes Aircraft Co., Los Angeles, CA
- Patent Number(s):
- US 4662741
- OSTI ID:
- 6507805
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420300* -- Engineering-- Lasers-- (-1989)
ACOUSTIC MEASUREMENTS
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
CRYSTALS
DATA PROCESSING
DESIGN
ELECTRICITY
ELECTRO-OPTICAL EFFECTS
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY MODULATION
HETERODYNE RECEIVERS
LASER CAVITIES
LASER RADIATION
LASERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
MODULATION
OSCILLATORS
PIEZOELECTRICITY
PROCESSING
PULSES
RADAR
RADIATIONS
RADIO EQUIPMENT
RANGE FINDERS
SIGNALS
SOUND WAVES
TRANSDUCERS