Optical Flats PRISMS & RETROREFLECTORSoptronics.gr/wp-content/uploads/2014/11/Prisms.pdfOptical Flats Prisms and Retrore≤ectors Spherical Lenses Cylindrical Lenses Multielement Lenses

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PRISMS & RETROREFLECTORSPRISMS AND RETROREFLECTORS

CVI Laser optics manufactures a large selection of high quality prisms and retroreflectors for use in many applications including diverse industrial and scientific uses, laser tracking and alignment, spectroscopy, and military applications such as range finding and atmospheric monitoring. The CVI prism and retroreflector offering includes wedge prisms, right-angle prisms, Pellin Broca prisms and dispersing prisms. Standard products are available in UV-grade fused silica and N-BK7 glass, and depending on your application, can be coated with one of our many available anti-reflection coatings. Custom dimensions and coatings are available for OEM applications. We encourage you to contact CVI Laser Optics directly for more information.

Please see Pg. IV for the Semi Custom Selection Guide.

SELECTION GUIDE 14

WEDGED PRISMS 15

RIGHT-ANGLE PRISMS 16

EQUILATERAL DISPERSING PRISMS 20

ISOSCELES DISPERSING PRISMS 21

PELLIN BROCA PRISMS 22

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SELECTION GUIDE

Product Type Descripton Page

WEDGE WINDOWS OR PRISMS

Wedge windows or prisms deviate an incident beam at a precise angle. Two wedge prisms of equal power can be combined to create a beam-steering apparatus that can place a beam anywhere within a cone defined by the deviation angle.

15

RIGHT-ANGLE PRISMS

Right-angle prisms bend the image by 90º and invert the image. Right-angle prisms may also be used to retroreflect a collimated beam (bend the image 180°).

16

EQUILATERAL DISPERSING & ISOSCELES BREWSTER PRISMS

Dispersing prisms are used to separate a beam of white light into its component colors. Generally, the light is first collimated and then dispersed by the prism. A spectrum is then formed at the focal plane of a lens or curved mirror. The dispersion of an iscosceles Brewster prism is less than that of an equilateral prism.

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PELLIN BROCA PRISMSIn a Pellin Broca prism, light enters the right-angle prism normal to one of its faces, is turned exactly 90°, is presented to the second “half” dispersing prism in minimum deviation, and hence exits the Pellin Broca prism deviated at exactly 90° to its initial direction. This is what is meant by calling the Pellin Broca prism a “constant deviation prism”.

22l1,l2

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SELECTION GUIDE

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15marketplace.idexop.com Large Wedge Windows

WEDGED PRISMS

LARGE WEDGEWINDOWS

Large wedge windows are laser quality windows manufactured with wedge angles of 1º or 3º. These larger wedges prevent interference due to stray back reflection. They have several applications in beam steering.

X All CVI Laser Optics low loss, high energy AR coatings available

X Other dimensions, wedge or material options available for OEM applications

SpecificationsProduct Code: LW-C • LW-UV

Optical Material: N-BK7 glass or UV-grade fused silica

Transmitted Wavefront Error: λ/10 @ 633 nm

Surface Quality: 10-5 scratch and dig

Diameter: Ø+0/–0.25 mm

Thickness: t±0.25 mm

Wedge: ±6 minutes

Clear Aperture: ≥85% of central diameter

f

t

a

S1 S2

Large wedge windows have an arrow marked at the thickest edge which points towards side 1 (S1). Side 1 (S1) is at normal incidence and side 2 (S2) is the wedge surface.

Standard ProductsØ (mm) t (mm) Wedge α PART NUMBER

Large Wedge Windows, N-BK7

25.4 9.5 1° LW-1-1037-C

50.8 9.5 1° LW-1-2037-C

25.4 9.5 3° LW-3-1037-C

50.8 9.5 3° LW-3-2037-C

Large Wedge Windows, Fused Silica

25.4 9.5 1° LW-1-1037-UV

50.8 9.5 1° LW-1-2037-UV

25.4 9.5 3° LW-3-1037-UV

50.8 9.5 3° LW-3-2037-UV

76.2 12.7 3° LW-3-3050-UV

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RIGHT-ANGLE PRISMS

RIGHT-ANGLEPRISMS

Right-angle prisms can be used to direct a beam of light at 90º from the incident beam or to retroreflect a beam. A right-angle prism may also be used as a front surface mirror.

X 90º reflector uses the hypotenuse face in total internal reflection (TIR) and an antireflection coating on the square faces (legs).

X 180º retroreflectors uses the square faces (legs) in total internal reflection (TIR) with an antireflection coating on the hypotenuse face.

X The prism can be used as an internal or external mirror by specifying a dielectric or metallic coating on the hypotenuse.

Most of the CVI Laser Optics coatings can be applied to prism surfaces.

APPLICATION NOTE

The inherent total internal reflection (TIR) at the

hypotenuse inverts the image and achieves a 90°

change in direction. Antireflection coatings are applied

to the two legs of a standard right angle prism (RAP)

to maximize the overall throughput and reduce back-

reflections off the interfaces to near zero.

A

A A

Right-Angle Prism as a Mirror (90º Bending)

The inherent total internal reflection (TIR) at the leg

faces to achieve a 180° change in direction (i.e.,

retroreflection). Antireflection coatings are applied to

the hypotenuse of a standard right angle prism (RAP)

to maximize the overall throughput and reduce any

back-reflection off the 0° interface.

ARcoating

point of TIR

point of TIR

Right-Angle Prism as a Retroreflector (180º Folding)

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17marketplace.idexop.com Uncoated Right-Angle Prisms

RIGHT-ANGLE PRISMS

UNCOATED RIGHT-ANGLE PRISMS

Right angle prisms (RAP) are most commonly used for image rotation, redirection of light and as components for both polarizing and non-polarizing beamsplitter cubes. Because of their simple 45º-45º-90º design and high-quality surface polish, they can be used as high energy 90º bending prisms or 180º folding prisms. They can be antireflection coated in these applica-tions to increase overall transmission, or metal coated for use as external turning mirrors.

X Contact CVI Laser Optics for other dimensions or material options for OEM applications

SpecificationsProduct Code: RAP-C • RAP-UV


Dimensional Tolerance: +0/–0.25 mm

Angular Deviation: ±3 arc min

Chamfer: 0.35 mm at 45° (typical)

Adhesion and Durability: Per MIL-C-675C. Insoluble in lab solvents.

Dimension A is to Theoretical Sharp

B

B

A

A

A

Uncoated right-angle prisms

Standard ProductsSurface Figure

Surface Quality

Optical Material A (mm) Clear Aperture

B (mm) PART NUMBER

Uncoated Right-Angle Prisms, N-BK7

λ/4 20-10 N-BK7 5.0 3.0 RAP-020-C

λ/4 20-10 N-BK7 10.0 8.0 RAP-040-C

λ/4 20-10 M N-BK7 12.7 10.8 RAP-050-C

λ/4 20-10 N-BK7 15.0 12.8 RAP-060-C

λ/4 20-10 N-BK7 20.0 17.0 RAP-080-C

λ/4 20-10 N-BK7 25.4 21.6 RAP-100-C

λ/2 60-40 N-BK7 40.0 36.0 RAP-157-C

Uncoated Right-Angle Prisms, Fused Silica

λ/10 10-5 Fused Silica 10.0 8.0 RAP-040-UV




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P90 right-angle bending prisms utilize the inherent total internal reflection (TIR) at the hypotenuse to invert the image and achieve a 90º change in direction. Antireflection coatings are applied to the two legs of a standard right angle prism (RAP) to maximize the overall throughput and reduce back-reflections off the interfaces to near zero.

P180 right-angle folding prisms utilize the inherent total internal reflection at the leg faces to achieve a 180º change in direction (i.e., retroreflection). Antireflection coatings are applied to the hypotenuse of a standard right angle prism (RAP) to maximize the overall throughput and reduce any back-reflection off the 0º interface.

Because the internal reflections are independent of wavelength, these prisms can also be used as high energy reflectors for broadband applications where metal mirrors are too absorbing and dielectric mirrors do not reflect a wide enough bandwidth.

Bending and folding prisms are stocked in both N-BK7 glass and UV-grade fused silica on ½-inch and 1-inch standard substrates, but can be made from any available RAP prism.

X Use P90 series 90º bending prisms as broadband, high energy 90º reflectors: CVI Laser Optics high energy AR and BBAR coatings can be applied to legs

X Use P180 series 180º folding prisms as broadband, high-energy retroreflectors : CVI Laser Optics high energy AR and BBAR coatings can be applied to hypotenuse

X Aluminized hypotenuse with black overcoat, other dimensions or wavelengths available for OEM applications

RIGHT-ANGLE PRISMS

PRECISION RIGHT-ANGLE BENDING & FOLDING PRISMS

Precision Right-Angle Bending and Folding Prisms

SpecificationsProduct Code: P90-C • P90-UV • P180-C • P180-UV


Surface Figure: N-BK7: λ/4 p-v at 633 nm before coating Fused silica: λ/10 p-v at 633 nm before coating

Surface Quality: N-BK7: 20-10 scratch and dig. Fused silica: 10-5 scratch and dig




Antireflection Coating: Single wavelength: R≤0.25% per surface Broadband: Ravg≤0.50% per surface

Coating Technology: Electron beam multilayer dielectric

Clear Aperture: ≥85% of central dimension

Damage Threshold: Pulsed: 10 J/cm2, 20 nsec, 20 Hz @ 1064 nm cw: 10 MW/cm2 @ 1064 nm

Adhesion and Durability: Per MIL-C-675C. Insoluble in lab solvents

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RIGHT-ANGLE PRISMS

Precision Right-Angle Bending and Folding Prisms

Standard ProductsA (mm) AR Coating

Range (nm) Reflectivity @ 0° Optical Material PART NUMBER

Standard Precision Right-Angle Bending Prisms

12.7 415.0-700.0 Ravg≤0.50%,

Rabs≤1.0% per surface

N-BK7 P90-050-415-700-C

12.7 633.0-1064.0 Ravg≤0.50%,

Rabs≤1.0% per surface

N-BK7 P90-050-633-

1064-C

12.7 1064.0 R < 0.25% per

surface N-BK7 P90-050-1064-C

25.4 1064.0 R < 0.25% per


Standard Precision Folding Prisms

12.7 1064.0 R < 0.25% per


25.4 1064.0 R < 0.25% per


A

A

S1

S2

Dimension A is to

Theoretical Sharp

Antireflection coating on surfaces S1 & S2

AS1

A

A

Dimension A is to Theoretical Sharp

Antireflection coating on surface S1

90º bending options

180º bending options

Semi Custom Use the selection menu below to build your own part

YOUR CUSTOM PART NUMBER P90 — 050 — 1064 — C

PRODUCT

P90 90° bending prism

P180 180° folding prism

SIZE CODE DIMENSION A (mm) (Theoretical Sharp)

050 12.7

100 25.4

ANTIREFLECTION COATING WAVELENGTH (nm)

193 266 532 1064

248 355 633 1050-1600

248-355 415-700 632-1064 1500

MATERIAL CODE MATERIAL

C N-BK7 Glass

UV UV-grade fused silica

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EQUILATERAL DISPERSING PRISMS

High-Precision Equilateral Dispersing Prisms

HIGH-PRECISION EQUILATERALDISPERSING PRISMS

Equilateral dispersing prisms are used for wavelength-separation applications. A light ray is twice refracted passing through the prism with total deviation denoted by θd in the figure below. Deviation is a function of refractive index and hence wavelength. Angular dispersion ∆θd is the difference in deviation for light rays having different wavelengths, and it varies with prism orientation.

X Reflection losses are minimized for unpolarized rays traveling parallel to the base of the prism. This condition is called minimum deviation.

X Minimum deviation occurs when the ray and wavelength angle of incidence at the entrance surface are equal to the angle of emergence (both angles measured with respect to the surface normals).

X Prisms are available in N-BK7, N-F2 and UV-grade fused silica.

X Antireflection coatings help reduce polarization at the prism surfaces by increasing total transmittance.

SpecificationsProduct Code: EDP-C • EDP-UV • EDP-F2

Optical Material: N-BK7, UV-grade fused silica, N-F2 glass

Surface Figure: λ/10 p-v at 633 nm

Surface Quality: 10-5 scratch and dig (N-BK7 glass and UV-grade fused silica) 30-10 scratch and dig (N-F2 and N-SF10 glass)





Damage Threshold: 15 J/cm2, 20 nsec, 20 Hz @ 1064 nm

Standard ProductsOptical Material A (mm) Refractive Index @ 633 nm PART NUMBER

High-Precision Equilateral Dispersing Prisms

N-BK7 25.0 1.51509 EDP-25.0-C

Fused Silica 25.0 1.45702 EDP-25.0-UV

N-F2 25.0 1.61658 EDP-25.0-F2

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EDP equilateral dispersing prisms use the phenomenon of an-gular dispersion to allow for wavelength separation

Equilateral dispersing prisms

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ISOSCELES DISPERSING PRISMS

Isosceles Brewster Prisms

B

H

CA

f

Isosceles Brewster prisms

ISOSCELES BREWSTER PRISMS

Isosceles Brewster angle prisms are designed specifically for intracavity laser applications, usually for specific wavelengths or wavelength ranges. The dispersion of these prisms is less than that of an equilaterial prism, but the beam enters and exits the prism near Brewster's angle, minimizing intracavity losses.

X GDD correction prisms for femtosecond systems

X Two sides (AB) optically polished

X Extremely small loss for p-polarized beam

X Other dimensions and materials available for OEM applications

SpecificationsProduct Code: IB-SS • IB-UV • IB-SF10

Optical Material: Suprasil 1, UV-grade fused silica or N-SF10 glass

Surface Figure: λ/10 p-v at 633 nm over clear aperture

Surface Quality: 10-5 scratch and dig (Suprasil 1 and UV-grade fused silica), 30-10 scratch and dig (N-SF10 glass)





Damage Threshold: Suprasil 1: 15 J/cm2, 20 nsec, 20 Hz @ 1064 nm Fused Silica: 15 J/cm2, 20 nsec, 20 Hz @ 1064 nm

Standard ProductsOptical Material A

(mm)B

(mm)C

(mm)H

(mm) Ø Refractive Index @ 633 nm

Design Wavelength (nm)

Refractive Index @ Design WL PART NUMBER

Isosceles Brewster Prisms

Suprasil 1 12.7 18.2 20.6 15.0 68.7° 1.45702 488 1.46301 IB-15.0-68.7-SS

Fused Silica 15.0 15.0 17.0 12.4 69.1° 1.45702 800 1.45332 IB-12.4-69.1-UV

N-SF10 15.0 15.0 15.1 13.0 60.6° 1.72314 80 0 1.7113 IB-13.0-60.6-SF10

N-SF10 25.0 25.0 25.2 21.6 60.6° 1.72314 800 1.7113 IB-21.6-60.6-SF10

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In a Pellin Broca prism, an ordinary dispersing prism is split in half along the bisector of the apex angle. Using a right-angle prism, the two halves are joined to create a dispersing prism with an internal right angle bend obtained by total internal reflection. See Figure 1.

A simple dispersing prism always deviates the longer wavelength less than the shorter wavelength. In a Pellin Broca prism, whether the longer wavelength is deviated more or less depends on the orientation of the prism. This is an important consideration when designing a high power Pellin Broca beam separator. This is illustrated in Figures 2 and Figures 3.

X Ideal for 90º wavelength deviation or beam separation

X Suprasil 1 for 180 to 240 nm region

X UV-grade fused silica for 240 to 2000 nm.

X Crystal quartz is specifically designed for high power Q-switched 266 nm laser pulses above fluence levels of 50 mJ/cm2

Pellin Broca Prisms

PELLIN BROCA PRISMS

PELLIN BROCA PRISMS

SpecificationsProduct Code: PLBC

Optical Material: Suprasil 1, UV-grade fused silica or Crystal Quartz

Surface Figure: λ/10 p-v at 633 nm over clear aperture

Surface Quality: 10-5 scratch and dig on three polished surfaces


Angular Deviation: α:±30 arc min β:±2°



Damage Threshold: 15 J/cm2, 20 nsec, 20 Hz @ 1064

Standard ProductsOptical Material

A (mm)

B (mm)

H (mm)

Clear Aperture

(mm)α β PART NUMBER

Pellin Broca Prisms

Suprasil 1 11.0 20.0 6.4 5.0 79.5° 60° PLBC-5.0-79.5-SS

Fused Silica

23.5 40.0 12.7 10.0 79.5° 60° PLBC-10.0-79.5-UV

Crystal Quartz

23.5 40.0 12.7 10.0 77.2° 60° PLBC-10.0-77.2-CQ

B

b

a

A

H

S1

S2

S3

l1, l2l1 > l2

l1 l2

l1, l2l1 > l2

l1l2

PLBC Pellin Broca prism

Figure 1. One of the wavelengths deviates by exactly 90º to its initial direction

Figure 2 and Figure 3. Whether the longer wavelength is deviat-ed more or less depends on the orientation of the prism.

Documents

Optical Flats PRISMS & RETROREFLECTORSoptronics.gr/wp-content/uploads/2014/11/Prisms.pdfOptical Flats Prisms and Retrore≤ectors Spherical Lenses Cylindrical Lenses Multielement Lenses