An optical apparatus for a head wearable display, the optical apparatus comprising: a lightguide including: a first side surface; a second side surface; an in-coupling region for receiving display light into the lightguide through the first side surface; an out-coupling region for emitting the display light out of the lightguide; and a relay region for guiding a path of the display light between the first and second side surfaces from the in-coupling region to the out-coupling region; wherein a forward propagation direction points from the in-coupling region towards the out-coupling region, and a backward propagation direction is opposite the forward propagation direction; a first in-coupling hologram disposed proximate to the first side surface at the in-coupling region to redirect the path of the display light by a first angle; a second in-coupling hologram disposed across from the first in-coupling hologram proximate to the second side surface at the in-coupling region to redirect the path of the display light by a second angle such that the path of the display light enters a total internal reflection TIR condition in the relay region after redirection by the first and second in-coupling holograms, wherein the first and second in-coupling holograms comprise reflection holograms and wherein the first hologram further comprises an angularly selective reflective hologram, the second in-coupling hologram being configured to reflect and diffract the display light along the backward propagation direction away from the out-coupling region, such that a direction of the display light includes a vector component that points away from the out-coupling region, while the first in-coupling hologram is configured to diffract and reflect the display light along the forward propagation direction towards the out-coupling region; an out-coupling optical element disposed at the out-coupling region to redirect the display light out of the lightguide and a display source to generate the display light, wherein the display source is disposed to illuminate the first side surface at the in-coupling region of the lightguide with the display light. a lightguide including: a first side surface; a second side surface; an in-coupling region for receiving display light into the lightguide through the first side surface; an out-coupling region for emitting the display light out of the lightguide; and a relay region for guiding a path of the display light between the first and second side surfaces from the in-coupling region to the out-coupling region; wherein a forward propagation direction points from the in-coupling region towards the out-coupling region, and a backward propagation direction is opposite the forward propagation direction; a first side surface; a second side surface; an in-coupling region for receiving display light into the lightguide through the first side surface; an out-coupling region for emitting the display light out of the lightguide; and a relay region for guiding a path of the display light between the first and second side surfaces from the in-coupling region to the out-coupling region; wherein a forward propagation direction points from the in-coupling region towards the out-coupling region, and a backward propagation direction is opposite the forward propagation direction; a first in-coupling hologram disposed proximate to the first side surface at the in-coupling region to redirect the path of the display light by a first angle; a second in-coupling hologram disposed across from the first in-coupling hologram proximate to the second side surface at the in-coupling region to redirect the path of the display light by a second angle such that the path of the display light enters a total internal reflection TIR condition in the relay region after redirection by the first and second in-coupling holograms, wherein the first and second in-coupling holograms comprise reflection holograms and wherein the first hologram further comprises an angularly selective reflective hologram, the second in-coupling hologram being configured to reflect and diffract the display light along the backward propagation direction away from the out-coupling region, such that a direction of the display light includes a vector component that points away from the out-coupling region, while the first in-coupling hologram is configured to diffract and reflect the display light along the forward propagation direction towards the out-coupling region; an out-coupling optical element disposed at the out-coupling region to redirect the display light out of the lightguide and a display source to generate the display light, wherein the display source is disposed to illuminate the first side surface at the in-coupling region of the lightguide with the display light.