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HMHR

HARD-MOUNTED HOLLOW RETROREFLECTORS™(HMHR)

  • Self-compensating mirror configuration with extraordinary beam return accuracy. 
  • Mirrors can be coated for maximization over a spectral range, from UV to far IR.
  • For critical applications, such as Michelson interferometers.
  • Performs well in harsh environmental conditions.
  • RoHS Compliant.
  • PLX is a registered ISO 9001 company.

Retroreflector Selector Chart

Coating Specification Chart

 

Hollow Retroreflectors

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The Hard-Mounted Hollow Retroreflector™ (HMHR) is a self-compensating mirror that is totally insensitive to position and movement, such as tilt.

Parallel incident light that hits the HMHR will be returned with great accuracy to the light source, regardless of the HMHR's physical orientation.

The HMHR is constructed of three first-surface mirrors assembled by a proprietary process into a mutually-orthogonal inside corner. The mirrors can be coated for maximization over a spectral range, from UV to far IR. This configuration eliminates material absorption and chromatic aberration. The mirror assembly of the HMHR is mounted on an Invar mount. (5.0"/127mm unit comes with aluminum mount). Invar is a low-expansion (CTE 0.75) alloy of iron and nickel that is used when control of thermally-induced dimensional change is required.

Stability and Accuracy

The HMHR offers properties which makes it especially suitable for critical applications, such as Michelson interferometers. The mount maintains stability of the distance between the apex of the corner cube and the back surface of the mount, as well as concentricity of the apex with respect to the mounting thread. HMHRs can also be provided in matched pairs for better modulation.

Coatings

Standard HMHR mirror coatings are aluminum, silver and gold, in both bare metal and with protective overcoats. All protected PLX coatings meet MIL-SPEC durability and adhesion requirements. Unprotected metallic coatings are especially suited to interferometric applications. Custom coatings available.

Custom configurations for specialized applications

PLX engineers can create a custom HMHR for your application. Potential variations include: smaller and larger apertures; modified hard mounts to meet your interface; super-critical accuracies; dielectric mirror coatings for high-powered lasers; and units able to withstand military and space environments.

Retroreflector Selector Chart

Cat. No. Clr. Aper. (in/mm) Beam* Deviation (arc.sec.) Exiting** Wavefront (p.v.633nm) WT.*** (gr.) 3D Models
& Diagrams
HM-10-1 1.0/25 1.0 0.15 25 Click Here
HM-10-2 1.0/25 2.0 0.25 25
HM-10-5 1.0/25 5.0 0.60 25
HM-10-10 1.0/25 10.0 1.25 25
HM-10-30 1.0/25 30.0 3.50 25
HM-15-05 1.5/38 0.5 0.10 45 Click Here
HM-15-1 1.5/38 1.0 0.20 45
HM-15-2 1.5/38 2.0 0.35 45
HM-15-5 1.5/38 5.0 0.90 45
HM-15-10 1.5/38 10.0 1.75 45
HM-15-30 1.5/38 30.0 5.25 45
HM-20-05 2.0/50 0.5 0.15 110 Click Here
HM-20-1 2.0/50 1.0 0.25 110
HM-20-2 2.0/50 2.0 0.50 90 Click Here
HM-20-5 2.0/50 5.0 1.25 90
HM-20-10 2.0/50 10.0 2.50 90
HM-20-30 2.0/50 30.0 7.00 90
HM-25-05 2.5/63 0.5 0.25 141 Click Here
HM-25-1 2.5/63 1.0 0.35 141
HM-25-2 2.5/63 2.0 0.60 110 Click Here
HM-25-5 2.5/63 5.0 1.50 110
HM-25-10 2.5/63 10.0 3.00 110
HM-25-30 2.5/63 30.0 9.00 110
HM-50-05 5.0/127 0.5 0.45 780 Click Here
HM-50-1 5.0/127 1.0 0.65 780
HM-50-2 5.0/127 2.0 1.25 551 Click Here
HM-50-5 5.0/127 5.0 3.00 551
HM-50-10 5.0/127 10.0 6.00 551
HM-50-30 5.0/127 30.0 18.0 551

Choose the coating you need:

COATING SPECIFICATION CHART

* Beam Deviation is the maximum deviation from parallelism, expressed in seconds of arc, of any single return beam from any of the 6 sub-apertures of the retroreflector, when the retroreflector is fully-illuminated.


** Exiting Wavefront is the resultant maximum peak-to-valley wavefront deformation from a fully-illuminated retroreflector, where lambda = 633nm.


*** Certain high accuracy models may be heavier than indicated here. Check with us for actual weight.

If you don't see what you need above:
Click here for a Custom Quote, specify what your application is and our engineering staff will get back to you.