Pulse stretcher

Details Pulse stretcher Pulse stretcher

1992-10-30

1994-05-03

Bovernick, Rodney B.

Coherent light generators

Particular beam control device

Control of pulse characteristics

372700, H01S 300, H01S 3101

Patent

active

053094565

ABSTRACT:
Apparatus (20) for increasing the length of a laser pulse to reduce its peak power without substantial loss in the average power of the pulse. The apparatus (20) uses a White cell (10) having a plurality of optical delay paths (18a-18d) of successively increasing number of passes between the field mirror (13) and the objective mirrors (11 and 12). A pulse (26) from a laser (27) travels through a multi-leg reflective path (28) between a beam splitter (21) and a totally reflective mirror (24) to the laser output (37). The laser pulse (26) is also simultaneously injected through the beam splitter (21) to the input mirrors (14a-14d) of the optical delay paths (18a-18d). The pulses from the output mirrors (16a-16d) of the optical delay paths (18a-18d) go simultaneously to the laser output (37) and to the input mirrors ( 14b-14d) of the longer optical delay paths. The beam splitter (21) is 50% reflective and 50% transmissive to provide equal attenuation of all of the pulses at the laser output (37).

REFERENCES:
patent: 3726598 (1973-04-01), Gilby et al.
patent: 4200846 (1980-04-01), Stark, Jr. et al.
Chernin and Barskaya, "Optical Multipass Matrix Systems," Applied Optics, vol. 30, No. 1, pp. 51-58, Jan. 1, 1991.

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