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RLD10 retroreflector interferometer

Retroreflector interferometers suitable for long range and high speed applications.

RLD10 detector heads house the interferometer optics, a unique multi-channel fringe detection system, laser shutter and integrated beam steerer.  Both 0° and 90° variants of the RLD10 detector head are available.

Features and benefits

  • Multi-axis solutions - single and dual axis retroreflecftor systems provide an ideal solution for multiple axis applications.
  • Long range and high speed - retroreflector interferometer detector heads allow for extended range or higher speed applications for which a plane mirror interferometer is not suitable.
  • Sensitive environments - also available as a low power variant, suitable for applications requiring a power dissipation lower than the specific < 2 W of the standard RLD10.


Axis travel0 m to 4 m
Resolution (configured with RLU)

Analogue quadrature = λ/2 (316 nm)
Digital quadrature = 20 nm
RPI20 resolution = 77.2 pm

System non-linearity error* (SDE)

*excludes interface

<±5 nm below 100 mm/sec with >70% signal strength
<±13 nm at 2 m/sec with >50% signal strength
Maximum speedUpto 2 m/sec

For axes longer than 4 m see our HS20 laser encoder system which support axes up to 60 m.

Non-vacuum applications require some form of refractive index compensation to maintain accuracy under fluctuating environmental conditions. Renishaw offers the RCU10 real-time quadrature compensation system to compensate for these variances. Renishaw supplied retroreflectors may not be suitable for use with vacuum or near vacuum applications.

Resolutions to 38.6 picometres can be achieved by integrating an RPI20 parallel interface into the RLE system (plane mirror configuration). For enhanced resolution with a digital output, the REE series of Renishaw interpolators can offer resolutions of up to .395 nm (plane mirror configuration). This interface accepts differential analogue 1 Vpp sine / cosine signals and provides a parallel format output. For more information on our accessories see RCU10 compensation system and laser encoder interfaces

Product information