The PLX Lateral Transfer Hollow PeriscopeTM (LTHP) is used to shift a beam laterally to any distance while maintaining the beam direction. It is extremely temperature stable and has a beam output as accurate as one arc second. 



  • The periscope produces one output beam parallel to the input beam, it can produce two output beams if a beamsplitter is used.
  • Beam deviation as accurate as one arc second.
  • Extremely temperature stable.
  • PLX is a registered ISO 9001 company.

Coating Specification Chart


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In applications when the LTHP is vibrated, the exiting beam remains static and maintains perfect parallelism with the entrance beam.

The LTHP is also useful where one of the mirrors is a 50-50 beamsplitter. This configuration produces two output beams, precisely parallel to each other, traveling in the same direction. In addition, the LTHP is extremely temperature stable because all component parts have the same coefficient of thermal expansion (CTE).


For applications where the major beam must be aligned with two or more other optical axis, see PLX Specification Sheet for "Rotary Movement Devices".

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When requesting a quote or placing an order, please specify your required offset. The offset is the distance from the center of one clear aperture to the other. All catalog periscopes are custom made units to your requested offset specification.

Specification Chart
Model Clear Aperture
Mirror Surface
Exiting Beam
Max Deviation
P-10 P-10 1.0/25 λ/10 - λ/2 1.0 - 30.0
P-20 P-20 2.0/51 λ/10 - λ/2 1.0 - 30.0
Download our product datasheet