RLU20 laser unit

RLU20 offers a laser frequency stability of ±2 ppb over any one hour time period, which provides ultimate measurement performance for the majority of vacuum applications.

Features and benefits

Combining the RLU20 with Renishaw detector heads (RLDs) suitable for the required application offers the following features and benefits:

  • Simple system architecture – utilising Renishaw’s unique fibre optic delivery system
  • Rapid alignment – RLD detector heads allow for laser beams to be mounted directly to the measurement axis
  • Compact and easy to set up – minimal system footprint and installation time

RLU20 overview

Fibre lengths 3 m only*
Number of axes Single or dual*
Laser source Class 2 HeNe
Outputs Analogue / digital
Velocities Up to 2 m/s**

* Configured from the factory
** Version / resolution dependent

RLU20 performance

Laser frequency stability (1 minute) ‹±1 ppb
Laser frequency stability (1 hour) ‹±2 ppb
Laser frequency stability (8 hours) ‹±20 ppb
Vacuum wavelength stability (over 3 years) ±0.1 ppm

Differential measurement application

Looking for a suitable laser encoder for a differential measurement application within a vacuum environment? The RLE20-DX-XP system is a popular choice for this type of application, utilising our RLU20 laser unit with two RLD10-X3-DI (differential interferometer) heads.


RLU20 laser unit