PLEIGER LASEROPTIK COMPONENTS AND COATINGS

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Quentin Underwood
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1 PLEIGER LASEROPTIK CO2-LASER COMPONENTS AND COATINGS

2 Content Introduction 1 Infrared Material Data 2 Laser Optics Lenses, Meniscus 4 Lenses, Plano Convex 6 Windows, AR-coated 8 Silicon, Mirror / High Reflector 9 Silicon, Reflective Phase Retarder 10 Silicon, Zero Phase Shift Mirror 11 Output Coupler 12 Rear Mirror 13 Coating Service 14 Cleaning 15 Abbreviations 17 Products / Overview / Contact 18 Thorium Free Coatings Low Absorption Lenses Without exception we use non-radioactive coating materials. All lenses are coated with a low absorbing AR-coating. P: F: E: info@pleiger-laseroptik.de

3 Introduction High-power CO2 laser optics The laser-optics division of Paul Pleiger Maschinenfabrik GmbH & Co. KG in Witten on the River Ruhr, supplies ready-to-use optical components for CO2 lasers throughout the world and coats customer s substrates for the complete near and far infrared ranges. We offer the following parts optimized for high-power CO2 lasers: Lenses: ZnSe, Ge, GaAs Windows: ZnSe, Ge, GaAs Cavity Optics: Si, ZnSe, Ge, GaAs High Reflection Mirrors: Si, Be Reflective Phase Retarders: Si Zero Phase Retarders: Si Output Coupler: ZnSe, Ge, GaAs Rear Mirror: ZnSe, Ge, GaAs Lenses We offer plano convex and meniscus lenses for focusing high-power CO2 laser beams for processing materials (cutting, welding). The ZnSe material used is exclusively of "CVD Laser Grade" quality with the very lowest absorption characteristics. Nonstandard focal lengths, diameters and specifications can be offered on request. Mirrors The manifold different applications for our mirrors, include cavity optics such as back mirrors, folding mirrors and output couplers. In addition we offer external optics such as beam benders, 90 phase retarders and telescope mirrors. On offer are partially reflecting mirrors / beam splitters and end mirrors with low residual transmission. Coatings All high-power optics manufactured by Pleiger are given our PICO coatings, which we are also be pleased to apply to substrates supplied to us. We carry out the coating process in one of the most modern high-vacuum coating units with precise monitoring of the layer thickness and automated monitoring systems. PICO HR: High Reflector Coating PICO HR DB: Double Band Coating PICO RPR: 90 Phase Retarder PICO ZPS: Zero Phase Coating PICO PLM: Polarization Locking PICO OC: Output Coupler Coating PICO ARLA: Anti-Reflection Coating Without exception we use exclusively non-radioactive coating materials from well-known manufacturers. Quality assurance Our measuring and testing devices cover all the parameters required for the production of high quality products. Laser Calorimetry Phase Retardance FTIR-Spectroscopy P: F: E: info@pleiger-laseroptik.de Page 1

4 Optical Materials ZnSe Transmission Range µm Materials Optical Refractive 10.6 µm Refractive Index 10.6 µm 3 x 10-6 Thermo-Optic 10.6 µm 611 x 10-6 K -1 Bulk Absorption 10.6 µm 5.0 x 10-4 cm -1 Thermal Thermal Expansion Coefficient 7.1 x 10-6 K -1 Thermal Conductivity 18 W/Km Heat Capacity J/gK Mechanical Hardness Knoop 110 kg/mm 2 Young's Modulus 67.2 GPa Poisson's Ratio 0.28 ZnS Optical Transmission Range µm Refractive 10.6 µm Refractive Index 10.6 µm 100 x 10-6 Thermo-Optic 10.6 µm 41 x 10-6 K -1 Bulk Absorption 10.6 µm 2 x 10-1 cm -1 Thermal Mechanical Thermal Expansion Coefficient 6.6 x 10-6 K -1 Thermal Conductivity 16.7 W/Km Heat Capacity J/gK Hardness Knoop kg/mm 2 Young's Modulus 74.5 GPa Poisson's Ratio 0.29 Page 2 P: F: E: info@pleiger-laseroptik.de

5 Ge Transmission Range 2-17 µm Optical Refractive 10.6 µm Thermo-Optic 10.6 µm 424 x 10-6 K -1 Bulk Absorption 10.6 µm 3.0 x 10-2 cm -1 Materials Thermal Thermal Expansion Coefficient 5.8 x 10-6 K -1 Thermal Conductivity 58.6 W/Km Heat Capacity J/gK Mechanical Hardness Knoop 780 kg/mm 2 Young's Modulus 103 GPa Poisson's Ratio 0.28 GaAs Optical Thermal Mechanical Transmission Range µm Refractive 10.6 µm Thermo-Optic 10.6 µm 150 x 10-6 K -1 Bulk Absorption 10.6 µm 2.0 x 10-2 cm -1 Thermal Expansion Coefficient 5.4 x 10-6 K -1 Thermal Conductivity 46.1 W/Km Heat Capacity J/gK Hardness Knoop 700 kg/mm 2 Young's Modulus 83 GPa Poisson's Ratio P: F: E: info@pleiger-laseroptik.de Page 3

6 Lenses Infrared Optics Catalogue Lenses, Meniscus Typical Specifications EFL Tolerance ± 2 % ET Tolerance ± 0.10 mm ± " Dimensions ETV ± 0.05 mm ± " Diameter Tolerance / mm / " Surface Figure depending upon radius Clear Aperture 90 % Surface Quality / Scratch-Dig Transmission > 99.3 % Coating Absorption < 0.15 % Reflection < 0.20 % per surface AOI 0-15 Page 4 P: F: E: info@pleiger-laseroptik.de

7 Diameter EFL ET Diameter EFL ET Order No. inch inch inch mm mm mm Lenses P: F: E: Page 5

8 Lenses Infrared Optics Catalogue Lenses, Plano Convex Typical Specifications EFL Tolerance ± 2 % ET Tolerance ± 0.10 mm ± " Dimensions ETV ± 0.05 mm ± " Diameter Tolerance / mm / " Surface Figure depending upon radius Clear Aperture 90 % Surface Quality / Scratch-Dig Transmission > 99.3 % Coating Absorption < 0.15 % Reflection < 0.20 % per surface AOI 0-15 Page 6 P: F: E: info@pleiger-laseroptik.de

9 Diameter EFL ET Diameter EFL ET Order No. inch inch inch mm mm mm Lenses P: F: E: Page 7

10 Windows, AR coated Typical Specifications Windows Dimensions Diameter Tolerance / mm / " Thickness Tolerance ± 0.13 mm ± " Parallelism Plano 3 arcmin Surface Figure 1 - ½ fringe Clear Aperture 90 % Surface Quality / Scratch-Dig Coating Transmission > 99.3 % Absorption < 0.20 % Reflection < 0.20 % per surface AOI 0-15 Diameter Thickness Diameter Thickness Order No. inch inch mm mm ZnSe Ge GaAs Page 8 P: F: E: info@pleiger-laseroptik.de

11 Silicon, Mirror / High Reflector Typical Specifications Diameter Tolerance / mm / " Dimensions Thickness Tolerance ± 0.25 mm ± " Parallelism Plano < 3 arcmin Surface Figure 2-1 fringes Clear Aperture 90 % Mirror Surface Quality / Scratch-Dig 10 5 Coating Reflection AOI 0 >99.8 % (HR) > 99.7 (HRDB) Reflection AOI 45 s-pol > 99.9 % (HR) > 99.8 (HRDB) Reflection AOI 45 p-pol > 99.7 % (HR) > 99.6(HRDB) Phase Shift AOI 45 < 3 (HR) < 3 (HRDB) Reflection AOI 45 at 633 nm 45 % (HR) > 75 % (HRDB) Diameter Thickness Diameter Thickness Order No. with coating inch inch mm mm HR HR DB P: F: E: info@pleiger-laseroptik.de Page 9

12 Silicon, Reflective Phase Retarder Typical Specifications Diameter Tolerance / mm / " RPR Dimensions Thickness Tolerance ± 0.25 mm ± " Parallelism Plano < 3 arcmin Surface Figure 2-1 fringes Clear Aperture 90 % Surface Quality / Scratch-Dig 10-5 Coating Reflection AOI 45 > 98.0 % Phase Retardation AOI 45 at 10.6 µm 90 ± 3 Reflection AOI 45 at 633 nm 45 % Diameter Thickness Diameter Thickness Order No. inch inch Mm mm Page 10 P: F: E: info@pleiger-laseroptik.de

13 Silicon, Zero Phase Shift Mirror Typical Specifications Diameter Tolerance / mm / " Dimensions Thickness Tolerance ± 0.25 mm ± " Parallelism Plano < 3 arcmin Surface Figure 2-1 fringes Clear Aperture 90 % ZPS Surface Quality / Scratch-Dig 10-5 Coating Reflection AOI 0 > 99.8 % Reflection AOI 45 s-pol > 99.8 % Reflection AOI 45 p-pol > 99.5 % Phase Shift AOI 45 < 2 Reflection AOI 45 at 633 nm 75 % Diameter Thickness Diameter Thickness Order No. inch inch mm mm P: F: E: info@pleiger-laseroptik.de Page 11

14 Output Coupler Typical Specifications Diameter Tolerance / mm / " OC Thickness Tolerance (plano) / mm / " Thickness Tolerance (curved) ± 0.25 mm ± " Dimensions Parallelism Plano Parallelism Curved Surface Figure < 3 arcmin < 5 arcmin 1 - ½ fringe Clear Aperture 90 % Surface Quality / Scratch-Dig 10-5 Diameter Thickness Diameter Thickness Side 1 R Material Order No. inch inch mm mm Radius PO 17 % ZnSe PO 60 % ZnSe PO 60 % ZnSe M CC 65 % ZnSe PO 27 % GaAs PO 65 % GaAs M CC 50 % ZnSe M CC 60 % ZnSe M CC 27 % GaAs M CC 50 % ZnSe M CC 40 % ZnSe M CC 60 % ZnSe S2: AR coated for 10.6 µm Page 12 P: F: E: info@pleiger-laseroptik.de

15 Rear Mirror Typical Specifications Dimensions Diameter Tolerance / mm / " Thickness Tolerance (plano) / mm / " Thickness Tolerance (curved) ± 0.25 mm ± " Parallelism Plano < 3 arcmin Parallelism Curved < 5 arcmin Surface Figure 1 - ½ fringe Rear Mirror Clear Aperture 90 % Surface Quality / Scratch-Dig 10-5 Diameter Thickness Diameter Thickness Side 1 R Material Order No. inch inch mm mm Radius M CC 99.5 % Ge M CC 99.5 % GaAs M CC 99.5 % Ge M CC 99.5 % Ge M CC 99.5 % GaAs M CC 99.5 % GaAs M CC 99.5 % Ge M CC 99.5 % Ge M CC 99.5 % Ge M CC 99.5 % Ge M CC 99.5 % Ge PO 99.5 % Ge S2: AR coated for 10.6 µm P: F: E: info@pleiger-laseroptik.de Page 13

16 Coating Service Typical Specifications Coatings Type Description Reflectance 10.6 µm Phase Shift [%] 633 nm s 45 -p 45 -r 45 -r 45 -r HR High Reflector Coating for 10.6 µm ± 3 > 45 HR DB RPR ZPS PLM OC RM High Reflector Coating for 10.6 µm and 633 nm 90 Reflective Phase Retarder for 10.6 µm Zero Phase Shift Coating for 10.6 µm Polarization Locking Coating for 10.6 µm Output Coupler Coating for 10.6 µm Rear Mirror Coating for 10.6 µm > 75 > ± 3 > ± 2 > 75 > 99.5 < 90.0 > AR Anti-Reflection for 10.6 µm Absorption < 0.20 % < 0.2 < 5 ARLA PG PS Mo Low Absorption AR for 10.6 µm Absorption < 0.15 % Protected Gold for the MIR to the FIR Protected Silver for the VIS to the FIR Molybdenum for the FIR < 0.2 < < 2 > > < 2 > 50 not intended for use at this parameter Page 14 P: F: E: info@pleiger-laseroptik.de

17 Cleaning General: All materials used for infrared optics are fragile - whether single crystal or polycrystalline - large or fine grained. They are not as strong as glass and will not withstand procedures normally used on glass parts. Infrared optics should never be touched. Always wear powder-free finger cots or surgical gloves. Dirt and oil from the skin can severely contaminate optics, causing a major reduction in performance. Do not use any tools to handle optics. Always place optics on the lens tissue supplied for protection. Never place optics on a hard or rough surface. Infrared laser optics can be easily scratched. Bare gold or bare copper should never be cleaned or touched. Cleaning Note: Except for Method 1, the cleaning procedures described here should not be used for new optics. New optics are cleaned and packaged prior to dispatch to ensure their high quality condition upon receipt. If you suspect a problem with contamination, or other cosmetic defects with a new optic, please contact Pleiger immediately. Method 1 - Mild Cleaning for Light Contamination (dust, lint particles) Use an air bulb to blow off any loose contaminants from the surface of the optic before proceeding to the cleaning steps. If this step does not remove the contamination, continue to Method 2. Note: Avoid using shop air lines because they usually contain significant amounts of oil and water. These contaminants can form detrimental absorbing films on optical surfaces. Method 2 - Mild Cleaning for Light Contamination (smudges, fingerprints) I. Dampen an unused cotton swab or a cotton ball with acetone or i-propanol. II. Gently wipe the surface with the damp cotton. Do not rub hard. III. Drag the cotton across the surface just fast enough so that the liquid evaporates right behind the cotton. This should leave no streaks. If this step does not remove the contamination, continue to Method 3. Note: Use only paper-bodied cotton swabs and high-quality surgical cotton balls. Reagent grade acetone and i-propanol are recommended. P: F: E: info@pleiger-laseroptik.de Page 15

18 Method 2 (alternative method) "Drop and Drag " - Mild Cleaning for Light Contamination Note: The "Drop and Drag" method is not a preferred cleaning method. Cleaning I. Lay a piece of lens tissue on the surface of the optic. II. Using an eyedropper, squeeze a few drops of acetone onto the lens tissue, so that the complete diameter of the optic is wetted. III. Without lifting the lens tissue, drag the lens tissue across the optic just fast enough so that the liquid evaporates behind the tissue. This should leave no streaks. If this step does not remove the contamination, continue to Method 3. Note: Use only the lens tissue supplied in the optics cleaning kit or another high-quality lens tissue. Reagent grade acetone is recommended. Method 3 - Moderate Cleaning for Moderate Contamination (spittle, oils) I. Dampen an unused cotton swab or cotton ball with white distilled vinegar. II. Using light pressure, wipe the surface of the optic with the damp cotton. III. Wipe away excess distilled vinegar with a clean dry cotton swab. IV. Immediately dampen a cotton swab or cotton ball with acetone. V. Gently wipe the surface of the optic to remove any acetic acid. Note: Use only paper-bodied cotton swabs. Use only high quality surgical cotton balls that have been sorted to remove any with embedded abrasives. White distilled vinegar with 6 % acidity should be used. Examination of Cleaned Optic The final step is to carefully examine the surface of the optic under good light in front of a black background. Note: Certain types of contamination and damage such as metal splatter, pits, etc, cannot be removed. If the optic shows this type of contamination or damage, it will probably need to be reworked or replaced. If reworking of an optic is necessary, contact Pleiger to make arrangements to return the part for repolishing and recoating. Page 16 P: F: E: info@pleiger-laseroptik.de

19 Abbreviations AOI AR ARLA BFL c.a. CT EFL ET ETV FFL GaAs Ge HR HR DB Mo OC P 1 Angle of incidence Anti-reflex Anti-reflex low absorption Back focal length Clear aperture Center thickness Effective focal length Edge thickness Edge thickness variation Front focal length Gallium Arsenide Germanium High reflector High reflector double band Molybdenum Output coupler First principal point, distance to convex surface = n(r 2 r 1CT r ) + CT(n 1) 1 Abbreviations P 2 PG PICO PLM PO PR PS PX r 1 r 2 RPR RM Si WD xxm CC ZnS ZnSe ZPS Second principal point, distance to concave surface Protected Gold Pleiger Infrared Coatings Phase locking mirror Plano Partial reflector Protected Silver Plano convex Radius of first surface Radius of second surface Reflective phase retarder Rear mirror Silicon Working distance xx meter concave Zinc sulfide Zinc selenide Zero phase shifter = n(r 2 r2ct r ) + CT(n 1) 1 P: F: E: info@pleiger-laseroptik.de Page 17

Products / Overview Lenses: Meniscus Lenses, Plano Convex Lenses, AR coated; Material: ZnSe, Ge, GaAs Windows: AR coated or uncoated; Material: ZnSe, Ge, GaAs

Material: Si Output Coupler and Rear Mirror: Reflection: 0.2-99.

Maschinenfabrik GmbH & Co. KG Division Laseroptik Im Hammertal 51 58456 Witten Germany T: +49 2324 398-401 F: +49 2324 398-402 E: info@pleiger-laseroptik.de www.

de Disclaimer The information here and the technical advice we give on applications in the form of text or on the basis of tests are provided to the best of our

The advice given does not free the user from checking for himself the applicability of our advice and of our products for the intended purpose/s.

20 Products / Overview Lenses: Meniscus Lenses, Plano Convex Lenses, AR coated; Material: ZnSe, Ge, GaAs Windows: AR coated or uncoated; Material: ZnSe, Ge, GaAs Mirror: High Reflection, High Reflection Double Band (633nm); Material: Si Mirror: Reflective Phase Retarder; Material: Si Mirror: Zero Phase Retarder; Material: Si Output Coupler and Rear Mirror: Reflection: %, PO/PO, PO/PX; Material: ZnSe, Ge, GaAs Coating Service: ARLA, AR, OC and RM on ZnSe, Ge, GaAs / HR, RPR, ZPS on Si and Cu Contact Paul Pleiger Maschinenfabrik GmbH & Co. KG Division Laseroptik Im Hammertal Witten Germany T: F: E: info@pleiger-laseroptik.de Disclaimer The information here and the technical advice we give on applications in the form of text or on the basis of tests are provided to the best of our knowledge but are valid only as non-binding hints whereby this also holds good in respect of any proprietary rights of third parties. The advice given does not free the user from checking for himself the applicability of our advice and of our products for the intended purpose/s. The applications and uses to which our products and to which the products manufactured by yourselves on the basis of our technical application-related advice are put lie outside our control and accordingly lie exclusively within the users area of responsibility. These products are sold in accordance with the terms laid down in our general terms of sale and delivery. P: F: E: info@pleiger-laseroptik.de

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