Mode locked laser range finder

Details Mode locked laser range finder Mode locked laser range finder

1976-11-24

1978-06-27

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 28, G01C 308, G01P 336

Patent

active

040971481

ABSTRACT:
A laser range finder utilizing a mode locked laser for measuring target range with a high degree of accuracy and simplicity by measuring the time of flight of a transmitted pulse utilizing the pulses in the laser cavity for clocking a range counter. The laser consists of mirrors with at least one being semi-reflective, an amplifying medium and a suitable method of mode locking. A switch is provided outside of the cavity for transmitting a gated train of ultra short pulses or a single pulse to a target. The return signal is processed, detected and sent to an electronic circuit which uses the detected signal to stop a counter at the proper range count. The pulses inside the cavity are detected after they pass through one of the mirrors to provide the range counting pulses as well as to energize the switch outside of the cavity at the proper switching time. Thus, the laser ranger in accordance with the invention does not require a separate oscillator and utilizes the oscillating pulse in the laser cavity to perform that function and provide extremely high range resolution.

REFERENCES:
patent: 3652161 (1972-03-01), Ross
patent: 3765768 (1973-10-01), Budin et al.
patent: 3945729 (1976-03-01), Rosen

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