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Cylindrical Achromatic Doublets


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General Specifications
AR Coating Ranges350 - 700 nm (-A Coating)
650 - 1050 nm (-B Coating)
Coating PerformanceRavg<0.5%
Damage Thresholdsa-A Coating: 0.50 J/cm2
(532 nm, 10 ns, 10 Hz, Ø0.566 mm)
-B Coating: 5 J/cm2
(810 nm, 10 ns, 10 Hz, Ø0.155 mm)
Diameter1"
Diameter Tolerance+0.00/-0.10 mm
Center Thickness Tolerance±0.10 mm
Focal Length Tolerance±1%
Surface Irregularity
(Peak to Valley)
λ
Surface Quality40-20 (Scratch-Dig)
Centration≤5 arcmin
Clear ApertureØ21 mm
Power Tolerance3 Fringes
Operating Temperature-40 to 85 °C
  • Limited by the antireflection coating.

Features

  • Focus Light in One Direction with Minimal Chromatic Aberration
  • Pre-Mounted Round Ø1" Design for Ease of Use
  • Produces Line Focus
  • Design Wavelengths:
    • 486.1, 587.6, 656.3 nm for Visible Doublets
    • 706.5, 855.0, 1015.0 nm for NIR Doublets

Thorlabs' cylindrical achromatic doublets are used to focus polychromatic light in one direction only while minimizing chromatic aberration. This creates a line focus rather than a point focus, as seen in spherical lenses. Our cylindrical achromatic doublets are pre-mounted in Ø1" housings for ease of use. The housings are engraved with part number, coating range, focal length, an arrow indicating the direction the lens should face to collimate a line source, and an infinity symbol indicating that this lens has an infinite conjugate ratio (i.e., if a diverging light source is placed one focal length away from the flat side of the lens, the light rays emerging from the curved side will be collimated).

Cylindrical lenses are desirable for various experimental setups, including beam shaping, laser projection, and holography. Cylindrical doublets drastically reduce chromatic aberration, and can produce a diffraction limited focus in one direction when used with monochromatic light.

Thorlabs' offers Cylindrical Achromatic Doublets with two of our standard anti-reflective coatings. Our A coating is designed for 350 - 700 nm, and our B coating is designed for 650 - 1050 nm. The coatings are applied to both outer surfaces.

Zemax Files
Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.
Optic Cleaning Tutorial
Optical Coatings and Substrates

Shown below is a theoretical graph of the percent reflectivity of the -A and -B AR coating as a function of wavelength. The design wavelength ranges for the -A and -B AR coatings are 350 - 700 nm and 650 - 1050 nm respectively. The average reflectivity in these ranges is < 0.5%.

Cylindrical Achromatic Doublet AR Coatings

Focal Length Shift Plots

Thorlabs' Cylindrical Achromatic Doublets offer excellent performance across a wide range of wavelengths. These plots show the change in focal length as a function of wavelength for each lens.
Click here to download focal length shift data.

Damage Threshold Specifications
Coating Designation
(Item # Suffix)
Damage Threshold
-A0.50 J/cm2 (532 nm, 10 ns, 10 Hz, Ø0.566 mm)
-B5 J/cm2 (810 nm, 10 ns, 10 Hz, Ø0.155 mm)

Damage Threshold Data for Thorlabs' Cylindrical Achromatic Doublets

The specifications to the right are measured data for Thorlabs' cylindrical achromatic doublets. Damage threshold specifications are constant for a given coating type, regardless of the size or focal length of the lens.

 

Laser Induced Damage Threshold Tutorial

This following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. The LIDT for an optic greatly depends on the type of laser you are using. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. Note that the guideline presented here assumes room temperature operation and optics in new condition (i.e., within scratch-dig spec, surface free of contamination, etc.). Because dust or other particles on the surface of an optic can cause damage at lower thresholds, we recommend keeping surfaces clean and free of debris. For more information on cleaning optics, please see our Optics Cleaning tutorial.

Testing Method

Thorlabs' LIDT testing is done in compliance with ISO/DIS11254 specifications. A standard 1-on-1 testing regime is performed to test the damage threshold.

First, a low-power/energy beam is directed to the optic under test. The optic is exposed in 10 locations to this laser beam for a set duration of time (CW) or number of pulses (prf specified). After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. The number of locations that are damaged at a particular power/energy level is recorded. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. This process is repeated until damage is observed. The damage threshold is then assigned to be the highest power/energy that the optic can withstand without causing damage. A histogram such as that below represents the testing of one BB1-E02 mirror.

LIDT metallic mirror
The photograph above is a protected aluminum-coated mirror after LIDT testing. In this particular test, it handled 0.43 J/cm2 (1064 nm, 10 ns pulse, 10 Hz, Ø1.000 mm) before damage.
LIDT BB1-E02
Example Test Data
Fluence# of Tested LocationsLocations with DamageLocations Without Damage
1.50 J/cm210010
1.75 J/cm210010
2.00 J/cm210010
2.25 J/cm21019
3.00 J/cm21019
5.00 J/cm21091

According to the test, the damage threshold of the mirror was 2.00 J/cm2 (532 nm, 10 ns pulse, 10 Hz, Ø0.803 mm). Please keep in mind that it is only representative of one coating run and that Thorlabs' specified damage thresholds account for coating variances.

Continuous Wave and Long-Pulse Lasers

When an optic is damaged by a continuous wave (CW) laser, it is usually due to the melting of the surface as a result of absorbing the laser's energy or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions. Additionally, when pulse lengths are between 1 ns and 1 µs, LIDT can occur either because of absorption or a dielectric breakdown (must check both CW and pulsed LIDT). Absorption is either due to an intrinsic property of the optic or due to surface irregularities; thus LIDT values are only valid for optics meeting or exceeding the surface quality specifications given by a manufacturer. While many optics can handle high power CW lasers, cemented (e.g., achromatic doublets) or highly absorptive (e.g., ND filters) optics tend to have lower CW damage thresholds. These lower thresholds are due to absorption or scattering in the cement or metal coating.

Linear Power Density Scaling

LIDT in linear power density vs. pulse length and spot size. For long pulses to CW, linear power density becomes a constant with spot size. This graph was obtained from [1].

Intensity Distribution

Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects. For beams with a large PRF both the average and peak powers must be compared to the equivalent CW power. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF.

In order to use the specified CW damage threshold of an optic, it is necessary to know the following:

  1. Wavelength of your laser
  2. Linear power density of your beam (total power divided by 1/e2 spot size)
  3. Beam diameter of your beam (1/e2)
  4. Approximate intensity profile of your beam (e.g., Gaussian)

The power density of your beam should be calculated in terms of W/cm. The graph to the right shows why the linear power density provides the best metric for long pulse and CW sources. Under these conditions, linear power density scales independently of spot size; one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other nonuniform intensity profiles and roughly calculate a maximum power density. For reference, a Gaussian beam typically has a maximum power density that is twice that of the uniform beam (see lower right).

Now compare the maximum power density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately. A good rule of thumb is that the damage threshold has a linear relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 10 W/cm at 1310 nm scales to 5 W/cm at 655 nm). While this rule of thumb provides a general trend, it is not a quantitative analysis of LIDT vs wavelength. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. While the above procedure provides a good rule of thumb for LIDT values, please contact Tech Support if your wavelength is different from the specified LIDT wavelength. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). Testing may result in additional costs or lead times. Contact Tech Support for more information.

Pulsed Lasers

As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. Pulsed lasers often do not heat the optic enough to damage it; instead, pulsed lasers produce strong electric fields capable of inducing dielectric breakdown in the material. Unfortunately, it can be very difficult to compare the LIDT specification of an optic to your laser. There are multiple regimes in which a pulsed laser can damage an optic and this is based on the laser's pulse length. The highlighted columns in the table below outline the pulse lengths that our specified LIDT values are relevant for.

Pulses shorter than 10-9 s cannot be compared to our specified LIDT values with much reliability. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. In contrast, pulses between 10-7 s and 10-4 s may cause damage to an optic either because of dielectric breakdown or thermal effects. This means that both CW and pulsed damage thresholds must be compared to the laser beam to determine whether the optic is suitable for your application.

Pulse Durationt < 10-9 s10-9 < t < 10-7 s10-7 < t < 10-4 st > 10-4 s
Damage MechanismAvalanche IonizationDielectric BreakdownDielectric Breakdown or ThermalThermal
Relevant Damage SpecificationN/APulsedPulsed and CWCW

When comparing an LIDT specified for a pulsed laser to your laser, it is essential to know the following:

Energy Density Scaling

LIDT in energy density vs. pulse length and spot size. For short pulses, energy density becomes a constant with spot size. This graph was obtained from [1].

  1. Wavelength of your laser
  2. Energy density of your beam (total energy divided by 1/e2 area)
  3. Pulse length of your laser
  4. Pulse repetition frequency (prf) of your laser
  5. Beam diameter of your laser (1/e2 )
  6. Approximate intensity profile of your beam (e.g., Gaussian)

The energy density of your beam should be calculated in terms of J/cm2. The graph to the right shows why the energy density provides the best metric for short pulse sources. Under these conditions, energy density scales independently of spot size, one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. For reference a Gaussian beam typically has a maximum power density that is twice that of the 1/e2 beam.

Now compare the maximum energy density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. A good rule of thumb is that the damage threshold has an inverse square root relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 1 J/cm2 at 1064 nm scales to 0.7 J/cm2 at 532 nm):

Pulse Wavelength Scaling

You now have a wavelength-adjusted energy density, which you will use in the following step.

Beam diameter is also important to know when comparing damage thresholds. While the LIDT, when expressed in units of J/cm2, scales independently of spot size; large beam sizes are more likely to illuminate a larger number of defects which can lead to greater variances in the LIDT [4]. For data presented here, a <1 mm beam size was used to measure the LIDT. For beams sizes greater than 5 mm, the LIDT (J/cm2) will not scale independently of beam diameter due to the larger size beam exposing more defects.

The pulse length must now be compensated for. The longer the pulse duration, the more energy the optic can handle. For pulse widths between 1 - 100 ns, an approximation is as follows:

Pulse Length Scaling

Use this formula to calculate the Adjusted LIDT for an optic based on your pulse length. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. Keep in mind that this calculation is only used for pulses between 10-9 s and 10-7 s. For pulses between 10-7 s and 10-4 s, the CW LIDT must also be checked before deeming the optic appropriate for your application.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. Contact Tech Support for more information.


[1] R. M. Wood, Optics and Laser Tech. 29, 517 (1997).
[2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003).
[3] C. W. Carr et al., Phys. Rev. Lett. 91, 127402 (2003).
[4] N. Bloembergen, Appl. Opt. 12, 661 (1973).

Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part Number Product Description
ACY254-050-A Support Documentation ACY254-050-A : f = 50 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
ACY254-050-B Support Documentation ACY254-050-B : f = 50 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
ACY254-075-A Support Documentation ACY254-075-A : f = 75 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
ACY254-075-B Support Documentation ACY254-075-B : f = 75 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
ACY254-100-A Support Documentation ACY254-100-A : f= 1 00 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
ACY254-100-B Support Documentation ACY254-100-B : f = 100 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
Part Number Product Description
ACY254-150-A Support Documentation ACY254-150-A : f = 150 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
ACY254-150-B Support Documentation ACY254-150-B : f = 150 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
ACY254-200-A Support Documentation ACY254-200-A : f = 200 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
ACY254-200-B Support Documentation ACY254-200-B : f = 200 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
ACY254-250-A Support Documentation ACY254-250-A : f = 250 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
ACY254-250-B Support Documentation ACY254-250-B : f = 250 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm

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Cylindrical Achromatic Doublets, AR Coating: 350 - 700 nm

Item # Diameter
(mm)
f
(mm)
fb
(mm)
R1
(mm)
R2
(mm)
R3
(mm)
T
(mm)
WD MaterialsTheoretical
Transmission
a
Design
Wavelengths
Reference
Drawing
ACY254-050-A 25.4 50 44.7 30.6 24.0 58.5 13.2 43.4 N-BK7/N-SF10 info 486.1, 587.6, 656.3 nm Cylindrical Achromatic Doublet Lens Drawing
ACY254-075-A 75 69.5 43.5 32.4 114.0 12.7 68.2 N-BK7/N-SF2 info
ACY254-100-A 100 94.8 53.0 45.5 203.0 11.2 93.5 N-BK7/N-SF2 info
ACY254-150-A 150 146.1 114.2 54.4 140.1 13.8 144.8 N-BK7/N-SF2 info
ACY254-200-A 200 196.2 152.2 72.3 187.5 13.9 194.9 N-BK7/N-SF2 info
ACY254-250-A 250 246.2 191.1 90.0 233.3 13.8 244.9 N-BK7/N-SF2 info
  • Click on More Info Icon for plots and downloadable data of the transmission for the lens.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
ACY254-050-A Support Documentation
ACY254-050-A Customer Inspired! f = 50 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
$357.00
3-5 Days
ACY254-075-A Support Documentation
ACY254-075-A Customer Inspired! f = 75 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
$357.00
Today
ACY254-100-A Support Documentation
ACY254-100-A Customer Inspired! f= 1 00 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
$357.00
Today
ACY254-150-A Support Documentation
ACY254-150-A Customer Inspired! f = 150 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
$357.00
Today
ACY254-200-A Support Documentation
ACY254-200-A Customer Inspired! f = 200 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
$357.00
Today
ACY254-250-A Support Documentation
ACY254-250-A Customer Inspired! f = 250 mm, Ø1" Cylindrical Achromat, AR Coating: 350 - 700 nm
$357.00
Today

Cylindrical Achromatic Doublets, AR Coating: 650 - 1150 nm

Item # Diameter
(mm)
f
(mm)
fb
(mm)
R1
(mm)
R2
(mm)
R3
(mm)
T
(mm)
WD MaterialsTheoretical
Transmission
a
Design
Wavelengths
Reference
Drawing
ACY254-050-B 25.4 50 43.8 26.0 25.9 72.6 13.8 42.5 N-BK7/N-SF11 info 706.5, 855.0, 1015.0 nm Cylindrical Achromatic Doublet Lens Drawing
ACY254-075-B 75 68.1 30.9 40.1 254.5 12.1 66.8 N-BK7/N-SF11 info
ACY254-100-B 100 92.6 42.7 54.1 286.4 13.5 91.3 N-BK7/N-SF11 info
ACY254-150-B 150 142.7 63.8 82.5 442.9 13.7 141.4 N-BK7/N-SF11 info
ACY254-200-B 200 192.9 85.4 109.6 575.6 13.8 191.6 N-BK7/N-SF11 info
ACY254-250-B 250 243.2 111.6 130.5 558.0 13.9 241.9 N-BK7/N-SF11 info
  • Click on More Info Icon for plots and downloadable data of the transmission for the lens.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
ACY254-050-B Support Documentation
ACY254-050-B Customer Inspired! f = 50 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
$357.00
Today
ACY254-075-B Support Documentation
ACY254-075-B Customer Inspired! f = 75 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
$357.00
Today
ACY254-100-B Support Documentation
ACY254-100-B Customer Inspired! f = 100 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
$357.00
Today
ACY254-150-B Support Documentation
ACY254-150-B Customer Inspired! f = 150 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
$357.00
Today
ACY254-200-B Support Documentation
ACY254-200-B Customer Inspired! f = 200 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
$357.00
Today
ACY254-250-B Support Documentation
ACY254-250-B Customer Inspired! f = 250 mm, Ø1" Cylindrical Achromat, AR Coating: 650 - 1050 nm
$357.00
Today
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