Passive one-way aberration correction using four-wave mixing

Abstract

We have demonstrated a passive method for recovering an optical image that has been degraded by being passed through a thin phase-aberrating medium. This method relies on a point source situated near the object of interest to sample the aberration impressed upon the wave front. Degenerate four-wave mixing in fluorescein-doped boric acid glass was used to reconstruct the wave front.

Removing orbital debris with pulsed lasers

“…When (φ+φo) = 0 [perigee at zenith], Eq. (19) shows !J N has no effect. This makes sense because !H = v r !v r + v " !v " and v r =0 at perigee.…”

“…(16) and (17) to obtain the radial and azimuthal components of the laser-induced target velocity change, and the parameter Δq using Eq. (19). Substitute the velocity increments into Eq.…”

“…An alternative to standard adaptive optics is BEFWM (Figure 5 1 ), a type of phase conjugation in which distortions are automatically compensated [19][20][21]. It may be easier to use BEFWM than classical adaptive optics, or perhaps a hybrid system will be best.…”

Processes Resulting from the Intensity-Dependent Refractive Index

“…The phase conjugation process is directly suited for removing the effects of aberrations in double pass, but under special circumstances can be used to perform single-pass aberration correction; see, for instance, MacDonald et al (1988). This proof shows that if the phase-conjugate mirror can generate a backward-going wave whose amplitude is the complex conjugate of that of the forward-going wave at any one plane (say the input face of the mirror), then the field amplitude of the backward-going wave will be the complex conjugate of that of the forward-going wave at all points in front of the mirror.…”

Optical Phase Conjugation

“…12 shows the method of single-pass aberration correction proposed and demonstrated by MacDonald et al [76]. This method requires that the aberrator be a thin aberrator so that it can be imaged into the nonlinear mixing crystal.…”