Aspherical Mirrors

Toroidal Mirrors TRseries

Highly-Smoothed Surface, High Reflectance, High Quality

Toroidal Mirrors TRseries
  • Shimadzu toroidal mirrors are manufactured by polishing optical glass with highly-smoothed surface.
  • Standard coating of Aluminum brings high reflectance in ultraviolet region.
  • The newly developed production method secures continuous delivery of stable quality products.
  • Non-Use of Specific Chemical Substances*1

*1. RoHS Directive: Directive on the restriction of the use of certain hazardous substances (mercury, cadmium, lead, hexavalent chromium, PBB and PBDE) in the EU. (EU Directive 2011/65/EC)

Toroidal mirrors are:

Toroidal mirrorsToroidal mirrors

Toroidal mirrors are aspherical mirrors where each curvature of orthogonal two axes (horizontal and vertical one) are different. Barrel or Tire shaped with a rotation axis are available.

Difference to spherical mirrors

When a spherical mirror focuses a light from a point source, there appears astigmatism. Toroidal mirrors, however, minimize such astigmatism and make it possible to focus on a small spot. The toroidals are ideal for focusing and/or aberration correction devices for spectroscopes.

Difference to spherical mirrorsDifference to spherical mirrors

Product List(Table of Code Number)

Code Number*1 Dimensions
Deflection Angle*2
Rh (mm)
Rh tolerance
Rv (mm)
Ratio(Rv/Rh) tolerance
Incident distance/ Exit distance*4
ℓ (mm)
TR052-17A2025 20×25×3.0 34 52 0.5% 47.6 0.5% 50
TR091-30A2025 20×25×3.0 60 91 0.5% 68.2 0.5% 79
TR232-24A3030 30×30×4.4 48 232.18 0.8% 194.03 0.8% 212
TR234-19A3035 30×35×6.0 39 234.19 0.8% 208.25 0.8% 221
TR785-38A7065 70×65×7.0 76 785.4 5.0% 487.6 2.0% 619
TR141-45A3520 35×20×4.0 90 141.4 0.8% 70.7 0.8% 100
TR282-45A4530 45×30×6.0 90 282.5 1.5% 141.4 0.8% 200
TR848-45A5540 55×40×8.5 90 848.5 1.5% 424.3 0.8% 600

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(※1) Code Number Meaning :
Code Number Meaning
(※2) When the incident angle is θ, the deflection angle is to be 2θ.
(※3) Curvature tolerance of Rv is defined by the curvature ratio against Rh.
(※4) Incident distance is the distance of the toroidal mirror from the point light source.
         Exit distance is the distance of the focal point from the toroidal mirror. (for reference only)

Standard Specifications

Material Soda glass
External dimensional tolerance (mm) ±0.2 (W) x ±0.2 (H)
Thickness tolerance(mm) ±0.2(T)
Effective area Total area less a 2mm strip around the perimeter
Coating Al(aluminum)
Scratches and digs 60-40(MIL-O-13830A)

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Storage Condition : no condensation

Schematic Diagram

Schematic Diagram
  • Toroidal mirrors other than standard products are available
  • Specifications are subject to change without notice for improvement.
  • OEM prices are also available. Please contact Shimadzu for details.

Optical Mount

Optical Mount

Example of applications

1. Focusing onto an optical fiber

Because of no lens, the toroidal mirrors can focus light of any wavelength without chromatic aberration.

Focusing onto an optical fiber
2. The optical system with 90 ° deflection angle

(ex : Alternative to 90°parabolic mirrors)

Simple optical layout can be designed and therefore easy optical axis adjustment is possible.

Alternative to 90°parabolic mirrors
3. Compact design

Space-saving design is feasible by minimizing interference from key components.

Compact design

This page may contain references to products that are not available in your country. Please contact us to check the availability of these products in your country.

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