The PLX Exceptional Performance Lateral Transfer Hollow RetroreflectorTM (LTHRXP): Designed to perform under the most extreme operating conditions.



  • Patent pending structural design and innovative mounting method.
  • Smaller envelop when space is at premium.
  • Available with sub arc second accuracy.
  • Unprecedented temperature range, ΔT=140°C (284°F).
  • Free-float stress free mounting.
  • Highly shock and vibration resistant.
  • Vacuum-compatible.
  • Large choice of coatings.

Coating Specification Chart


Lateral Transfer Hollow Retroreflectors™ (LTHR) Series

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PLX Exceptional Performance Lateral Transfer Hollow Retroreflectors™ (LTHRXP) features a lightweight stress-free mounting bracket and outstanding stability under extreme temperatures.

PLX's new patent pending ULTRA stable structural design provides a lightweight, stress-free unit for applications requiring a compact overall size while maintaining exceedingly high accuracy across an unprecedented temperature range, ΔT=140°C (284°F). 

The new Lateral Transfer Hollow Retroreflector™ mounting bracket can be customized for the desired clear aperture, offset, material requirements, and more. It is combined with innovative impact-damping mounting pads, which provide high resistance to shock and vibration. 

It is vacuum-compatible, provides up to sub arc second accuracy, and is highly suited for space applications.

These features enable greater versatility, making the LTHRXP suitable for critical optical alignment applications such as boresighting, cameras, telescopes, and lasers.

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

Specification Chart
Model Clear Aperture
Mirror Surface
Exiting Beam
Max Deviation
L-10-XP L-10-XP 1.0/25 λ/10 - λ/8 1.0 - 10.0
L-20-XP L-20-XP 2.0/51 λ/10 - λ/8 1.0 - 10.0
Download our product datasheet