Target feature integrated laser field conjugation system

摘要

An Integrated Laser Field Conjugation System (ILFCS) for end-to-end compensation of high-energy laser for propagation through turbulence with non-cooperative target. ILFCS using interferometric slaving technique and stand-alone adaptive optical systems to effect pre-compensation of amplitude and phase aberrations in turbulent medium, providing pre-compensation for aberrations in a laser amplifier. Performing compensation functions in low-power beam paths, increasing capability, reducing cost, reducing size compensation components for phase correction devices. Pre-compensating low-power master oscillator beam for aberrations in both high-power amplifier and turbulent propagation path-to-target with configuration enabling wavefront sensing of aberrations. Can be configured to perform phase compensation, or compensation of phase/amplitude aberrations. Capability to compensate aberrations in master oscillator beam. ILFCS enables integration with a short pulse mode locked laser for use in Target Feature Adaptive Optics (TFAO) or with a mode locked ultra short pulse laser with carrier envelope phase stabilization for use in Broadband Coherent Adaptive Optics (BCAO).

主权项

1. An electro-optical system for projection of laser beams through a turbulent medium to a non-cooperative target, the system comprising:
a) a master oscillator beam having a first optical path to an amplifier means; b) said amplifier means forming a high energy laser (HEL) beam to a target via a second optical path; c) said second optical path including a steering mirror and a telescope; d) a mode locked beacon master oscillator that produces a majority beacon beam comprising a high repetition rate (ranging from about 100 to 100000 Hz) sequence of transform limited pulsed laser beams and producing a minority reference beam that has a repetition rate defined by the cavity length of the mode locked beacon master oscillator (ranging typically from MHz to GHz); e) wherein a timing delay circuit receives the minority reference beam and produces a delayed reference beam that is delayed to coincide with an arrival of a return beacon beam from a target aimpoint along a propagation path axis; f) said majority beacon beam transmitted via a third optical path to a medium power amplifier means which sends the majority beacon beam via a fourth optical path to the target; g) wherein said return beacon beam comprising a high repetition rate pulse train beam returns from the target through the turbulent medium, telescope, a fifth optical path, and an about quarter waveplate in the fifth optical path, then passes through a first polarizing wave splitter optic; h) wherein the return beacon beam is then directed to a first beacon wave front sensor (WFS) where it is combined with the minority reference beam to form a composite beam for phase measurement; i) said first WFS controlling a first phase correction and steering device pair which (1) corrects the majority beacon beam with respect to phase aberrations caused by propagation through the turbulent medium and (2) provides phase commands to the first phase correction and steering device pair that will result in correction of amplitude aberrations in the beacon beam caused by propagation through the turbulent medium; j) a tracker and aim point controller which receives an image of the target from an illumination source to generate a control signal to control a steering mirror; k) a third WFS receives a sample beam from the minority reference beam after it passes through a spatial filter optic and the fourth correction and steering device pair to compare to a sample of the majority beacon beam after it passes through a sixth optical path including a propagation optics and the third correction and steering device pair; l) said third WFS also receives a HEL amplifier probe beam after it passes through the amplifier means to interfere with a sample probe beam from the HEL amplifier probe; and m) said third WFS controlling a fourth correction and steering device pair to correct for aberrations in the master oscillator and amplifier means.