Patent ID: 7576933

Claim:
A system of an optical delay line, comprising: a source, generating beams; and an array of mirrors, comprising a first reflective mirror, a second reflective mirror, a third reflective mirror, and a fourth reflective mirror, wherein said array of mirrors sets a plurality of paths for said beams to pass through, wherein said paths comprise: a first path, connecting between said first reflective mirror and said second reflective mirror, wherein angles of reflection of said beams reflected by said first reflective mirror are changed by rotating said first reflective mirror; a second path, connecting between said second reflective mirror and said third reflective mirror, wherein said second reflective mirror is perpendicular to said third reflective mirror; a third path, connecting between said third reflective mirror and said first reflective mirror; and a fourth path, connecting between said first reflective mirror and said fourth reflective mirror, wherein said fourth reflective mirror is inclined positioned at a first angle in order that said beams reflected from said fourth reflective mirror are collinear with incident beams on said fourth reflective mirror; wherein said beams from said source are incident on said fourth reflective mirror via said first path, said second path, said third path, and said fourth path, in turn, and reflected by said fourth reflective mirror to depart from said array of mirrors via said fourth path, said third path, said second path, and said first path, in turn.