General Specifications
Design Wavelengths	486.1 nm, 587.6 nm, and 656.3 nm (Finite Conj. Ratio) 633 nm (Infinite Conj. Ratio)
Clear Aperture	90% of Diameter
Diameter Tolerance	+0.00/-0.10 mm
Focal Length Tolerance	±1%
R_avg (400 - 700 nm)	<0.5%
Surface Quality	40-20 Scratch-Dig
Centration	<3 arcmin
Damage Threshold	30 MW/cm² (532 nm, 10 ns pulse, 10 Hz, Ø0.566 mm)
Operating Temperature	-40 to 85 ^oC

Features

Ø1/4", Ø1/2", or Ø1" Unmounted Achromatic Triplets
Steinhel Design for Finite Conjugate Ratios
Hastings Design for Infinite Conjugate Ratios
AR Coated for the 400 - 700 nm Range (R_avg < 0.5%)
Excellent Aberration Compensation

An achromatic triplet is the simplest lens that corrects all primary chromatic aberrations. Thorlabs' Steinhel achromatic triplets are designed to provide a finite conjugate ratio and 1:1 imaging. In contrast, our Hastings triplets provide an infinite conjugate ratio and are useful for focusing collimated beams and for magnification. These triplets consist of a low index center element cemented between two identical high index outer elements (see Specs tab) and feature good on-axis and off-axis performance. Mounted versions are also available.

The shaded area in the reflectivity plot to the right indicates the region over which the antireflection coating is optimized.

Shown below is a theoretical graph of the percent reflectivity of the -A AR coating as a function of wavelength. The average reflectivity in the 400 - 700 nm range is < 0.5%. The shading indicates the region for which the AR coating is optimized.

Click to Enlarge

Click here to download the data for these plots.

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Item #

Diameter
(mm)

f
(mm)

WD
(mm)

R₁^a
(mm)

R₂^b
(mm)

t_c1^c
(mm)

t_c2
(mm)

t_e
(mm)

Materials
(Outer/Inner)

Refractive Index^d
(Outer/Inner)

Reference
Drawing

TRS064-010-A

6.35

10.2

18.8

9.3

3.8

0.5

3.7

N-SF8/N-BAF52

1.68/1.61

TRS127-020-A

12.7

20.4

37.3

18.3

7.4

1.0

8.0

7.8

N-SF8/N-BAF52

1.68/1.61

TRS254-040-A

25.4

40.6

69.3

28.8

13.3

5.2

19.8

24.4

N-F2/N-K5

1.62/1.52

Item #

Diameter
(mm)

f
(mm)

WD
(mm)

R₁^a
(mm)

R₂^b
(mm)

t_c1^c
(mm)

t_c2
(mm)

t_e
(mm)

Materials
(Outer/Inner)

Refractive Index^d
(Outer/Inner)

Reference
Drawing

TRH064-010-A

6.35

10.2

7.8

7.4

3.5

0.5

5.0

4.7

N-F2/N-K5

1.62/1.52

TRH127-020-A

12.7

20.0

15.9

14.9

8.3

2.0

8.0

9.3

N-SF5/N-K5

1.67/1.52

TRH254-040-A

25.4

40.0

32.3

30.2

14.2

2.5

17.0

16.5

N-F2/N-K5

1.62/1.52

View All »Matching Part Numbers

Unmounted Visible Achromatic Triplets

Features