A method of fabricating an optical aperture multiplier (1, G, 1") comprising: obtaining a slice having a plurality of external faces including a pair of parallel faces (112a, 112b), and a first plurality of mutually parallel partially reflective internal surfaces oblique to the pair of parallel faces (112a, 112b); obtaining a first optical structure (220, 320) having a plurality of external surfaces including a planar coupling surface (222, 322), and a second plurality of mutually parallel partially reflective internal surfaces (203a, 45) oblique to the coupling surface (222, 322); bonding the slice with the first optical structure such that one of the faces of the pair of parallel faces (112a, 112b) is brought into facing relation with the coupling surface (222, 322), thereby forming a second optical structure (240, 340); and slicing out at least one optical aperture multiplier (1, G, 1") from the second optical structure (240, 340) by cutting the second optical structure (240, 340) through at least two cutting planes (244, 344) that are perpendicular to the coupling surface (222, 322); wherein the first optical structure is formed as a bonded stack of light-guide optical elements LOEs, each LOE of the bonded stack having a pair of major parallel surfaces (22a, 22b) and a subset of the second plurality of mutually parallel partially reflective internal surfaces oblique to the pair of major parallel surfaces (22a, 22b); characterized in that the bonded stack includes a plurality of transparent spacer plates, wherein the LOEs and the transparent spacer plates alternate along a length of the bonded stack perpendicular to the major parallel surfaces (22a, 22b) of the LOEs and wherein the at least two cutting planes are located in consecutive spacer plates having one of the LOEs sandwiched therebetween. obtaining a slice having a plurality of external faces including a pair of parallel faces (112a, 112b), and a first plurality of mutually parallel partially reflective internal surfaces oblique to the pair of parallel faces (112a, 112b); obtaining a first optical structure (220, 320) having a plurality of external surfaces including a planar coupling surface (222, 322), and a second plurality of mutually parallel partially reflective internal surfaces (203a, 45) oblique to the coupling surface (222, 322); bonding the slice with the first optical structure such that one of the faces of the pair of parallel faces (112a, 112b) is brought into facing relation with the coupling surface (222, 322), thereby forming a second optical structure (240, 340); and slicing out at least one optical aperture multiplier (1, G, 1") from the second optical structure (240, 340) by cutting the second optical structure (240, 340) through at least two cutting planes (244, 344) that are perpendicular to the coupling surface (222, 322); wherein the first optical structure is formed as a bonded stack of light-guide optical elements LOEs, each LOE of the bonded stack having a pair of major parallel surfaces (22a, 22b) and a subset of the second plurality of mutually parallel partially reflective internal surfaces oblique to the pair of major parallel surfaces (22a, 22b); characterized in that the bonded stack includes a plurality of transparent spacer plates, wherein the LOEs and the transparent spacer plates alternate along a length of the bonded stack perpendicular to the major parallel surfaces (22a, 22b) of the LOEs and wherein the at least two cutting planes are located in consecutive spacer plates having one of the LOEs sandwiched therebetween.