Amplifiers – Parametric amplifiers – Semiconductor type
Patent
1989-06-28
1990-11-20
Moskowitz, Nelson
Amplifiers
Parametric amplifiers
Semiconductor type
372 25, H01S 310, H01S 313
Patent
active
049721569
ABSTRACT:
A system and method for producing relatively square laser pulses derived from relatively Gaussian laser pulses. The system comprises a phase conjugate laser system that comprises a laser oscillator, an amplifying medium and a phase conjugate mirror having a nonlinear confined at a predetermined pressure. The mirror is adapted to truncate the front portion of an applied laser pulse. A plasma switch is disposed between the laser oscillator and the amplifying medium that has a gas confined therein at a predetermined pressure. The plasma switch and phase conjugate mirror cooperate to truncate the laser pulse to produce a laser pulse having a relatively square shape. Controlling the pressures in the plasma switch and phase conjugate mirror provides a means of controlling the formation of square-shaped laser pulses. In addition, a delay line may be employed in the system that is controllable in length that assists in controlling the truncation of the pulse in the plasma switch. A method of forming a square laser pulse in accordance with the invention comprises the following steps. A laser pulse is propagated through a plasma switch, and the pressure therein is adjusted to truncate the rear portion of the laser pulse. The truncated laser pulse is then transmitted through a laser amplifier medium to amplify the laser pulse. The amplified laser pulse is then reflected from a phase conjugate mirror. The pressure in the phase conjugate mirror is adjusted to a predetermined pressure to truncate the front portion of the laser pulse, thus producing a relatively square output pulse. Additionally, the relative length of a delay line disposed in the optical path may also be adjusted to assist in truncating the rear portion of the laser pulse.
REFERENCES:
patent: 4571954 (1986-02-01), Roberts et al.
patent: 4642582 (1987-02-01), O'Meara
patent: 4734911 (1988-03-01), Bruesselbach
patent: 4791644 (1988-12-01), Dube
Kurmit et al.; "Application of . . . KrF Pulses"; IEEE J. Quant. Elec., vol. 25, #3, pp. 421-429, 3/89, Abst. only.
Gregor Eduard
Muir Alexander R.
Sorce James S.
Denson-Low Wanda K.
Hughes Aircraft Company
Moskowitz Nelson
Steeter William J.
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