Coatings. Ion Assisted Deposition (IAD) process Advance Plasma Source (APS) plasma-ion assisted Deposition. Coatings on Optical Fibers

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1 Anti-Reflection Custom Ion Assisted Deposition (IAD) process Advance Plasma Source (APS) plasma-ion assisted Deposition Anti-Reflection on Optical Fibers OptoSigma supplies a wide selection of optical thin film coatings. These coatings are often provided as part of the optical component but they may also be ordered separately to be applied to an uncoated element. For example, it is possible to apply an Anti- Reflection coating to any uncoated lenses, windows or optical fibers. Also reflecting coatings may be applied to uncoated substrates to form mirrors or partial reflectors. To make this process simple we have listed some of our most common standard coatings. To order you simply append the coating suffix to the base part number and specify the surfaces to be coated. If you don t find the exact coating you need please ask us to provide you with a custom solution. Our coating engineers will use the latest design software and production techniques to provide you with the coating you require. Optical thin film coatings are used to control the intensity, wavelength selection and polarization characteristics of incident electro-magnetic radiation. For laser and precision optical applications the quality of the coating is critical. must be precise as well as durable and damage resistant. OptoSigma s advanced IAD and advanced plasm source (APS) coating facility in Santa Ana, California is able to supply high performance laser coatings covering the optical spectrum from 190 to 3000nm. 14

2 Anti-Reflection THIN FILM COATINGS Anti-Reflection Lenses Windows Optical Fiber Endfaces Custom We offer a wide range of Anti-Reflection coatings which may be applied to any of our glass or fused silica lenses or windows to reduce reflection losses. Through use of our Ion Assisted Deposition (IAD) process we also specialize in AR coatings on optical fiber endfaces. Low temperature IAD coatings may be applied to most fiber endface terminations. Pre and post coating inspection is performed in our dedicated facility to ensure high quality. Our Super-V represent the ultimate in low reflection coatings (R<0.1%) for narrowband applications. We also offer laser line V, Broadband Multilayer AR, Multiband AR, Telecom AR and Single Layer AR MgF 2. Standard coatings may be ordered by simply appending a coating suffix to the product number and specifying the number of sides to be coated. For more complex requirements we suggest that you call - our applications engineers will be pleased to advise you on the best coating for your needs. Standard Anti-Reflection coatings are listed in the following table. Specifications Tolerances On BK-7 Substrates: Super V: R<0.1% per surface at designated wavelength V Coating: ( λ<325nm) R<0.5% per surface at designated wavelength V Coating: ( λ>325nm) R<0.25% per surface at designated wavelength Multiband AR: R<0.25% per surface at designated wavelengths Broadband AR: R<0.6% per surface over the designated range MgF 2 AR: R<2.5% per surface over the designated range Durability and Laser damage threshold depend on the substrate so please see the later sections of this catalog for these specifications. The curves on the following pages show typical single surface reflectance for each of the specified coating types. 15

3 Anti-Reflection Custom 16

4 Anti-Reflection Custom 17

5 Anti-Reflection 5 4 Custom R (%) NEAR IR BROADBAND ANTI-REFLECTION COATING A59 ( nm) OptoSigma coatings are manufactured using Ion Assisted Deposition (IAD) technology yielding highly densified coatings with extremely low losses and high laser damage thresholds. Anti-Reflection (Continued) Type Wavelength Range, λ 0 (nm) Reflectivity per Surface (%) Minimum Price per Side 1-9 Pieces Price per Side 10 Pieces Coating suffix Super V Coat 633 <0.1 V33 Super V Coat 670 <0.1 V36 Super V Coat 780 <0.1 V40 Super V Coat 830 <0.1 V43 Super V Coat 980 <0.1 V44 Super V Coat 1012 <0.1 V45 Super V Coat 1064 <0.1 V46 Super V Coat 1310 <0.1 V48 Super V Coat 1550 <0.1 V49 V Coat 193 <0.5 A03 V Coat 248 <0.5 A04 V Coat 266 <0.5 A05 V Coat 281 <0.5 A06 V Coat 308 <0.5 A07 V Coat 325 <0.25 A08 18

6 Anti-Reflection (Continued) THIN FILM COATINGS Type Wavelength Range, λ 0 (nm) Reflectivity per Surface (%) Minimum Price per Side 1-9 Pieces Price per Side 10 Pieces Coating suffix Anti-Reflection Custom V Coat 337 <0.25 A11 V Coat 352 <0.25 A13 V Coat 355 <0.25 A14 V Coat <0.25 A15 V Coat 405 <0.25 A18 V Coat 416 <0.25 A16 V Coat <0.25 A17 V Coat <0.25 A19 V Coat 514 <0.25 A22 V Coat <0.25 A26 V Coat 543 <0.25 A28 V Coat 594 <0.25 A30 V Coat 612 <0.25 A31 V Coat <0.25 A33 V Coat <0.25 A36 V Coat 750 <0.25 A39 V Coat 780 <0.25 A40 V Coat 830 <0.25 A41 V Coat 905 <0.25 A43 V Coat 980 <0.25 A44 V Coat 1064 ( ) <0.25 A46 V Coat 1150 <0.25 A47 V Coat 1310 <0.25 A48 V Coat <0.25 A49 V Coat <0.25 A50 Multiband AR <0.4 A57 Multiband AR <0.25 A77 Multiband AR <0.25 A78 Multiband AR <0.5 <0.25 A79 Broadband AR <0.5 A51 Broadband AR <0.6 A52 Broadband AR <0.6 A55 Broadband AR <1.0 A56 Broadband AR <0.6 A58 Broadband AR <2.0 A59 Broadband AR <0.6 A62 Broadband AR <0.6 A63 Broadband AR <0.6 A66 Broadband AR <0.6 A67 Broadband AR <0.6 A69 MgF <2.5 A88 MgF <2.5 A89 MgF <2.5 A99 Telecom AR <0.4 A92 Telecom AR <0.25 A93 Telecom AR <0.1 A95 For components over 55mm diameter the price per surface will be doubled. For quantities in excess of 20 pieces ask for our discounted prices. 19

7 Anti-Reflection Custom We offer narrowband and broadband dielectric high reflecting coatings as well as a range of metal coatings. Laser Line HR are offered for all major laser wavelengths in the range of 193 to 2100nm. Broadband HR are offered for a selection of bandwidths. They provide a very high degree of spectrally neutral reflection and represent the ultimate in optical mirror coatings. Most of the coatings listed are for use at 45 degrees angle of incidence, but we do offer a selection of Broadband, Normal Incidence HR. Other normal incidence coatings can be provided on special request. Metal coatings, such as Protected Aluminum, Protected Silver or Protected Gold provide reflectance over an extremely broad spectral range. These coatings are protected by a thin layer of dielectric material in order to make them durable. It is also possible to enhance the performance of metal coatings by adding several dielectric layers over the metal coating. Specifications Tolerances Narrowband Laser HR: ( λ=193nm) Rav >95% for 45 incidence at designated wavelength Narrowband Laser HR: ( λ>193 and <300nm) Rav >95% for 45 incidence at designated wavelength Broadband HR: (45 AOI) R av >99.0% for 45 incidence over designated bandwidth Protected Aluminum: R av >88.0% from 400 to 2000nm Enhanced Aluminum: R av >94.0% from 400 to 700nm Protected Silver: R av >96% from 400 to 2000nm Enhanced Silver: R av >97.5% from 400 to 700nm Protected Gold: R av >96% from 650nm to >20µm Durability and Laser damage threshold depend on the substrate so please see the product sections of this catalog for these specifications. The curves show typical average reflectivity for a selection of our standard coatings. 20

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15 Anti-Reflection Type Wavelength Range (nm) Reflectivity per Surface (%) Minimum Price per Side 1-9 Pieces Price per Side 10 Pieces Coating suffix Custom Laser Line HR 193 >95.0 R03 Laser Line HR 248 >99.0 R04 Laser Line HR 266 >99.0 R05 Laser Line HR 281 >99.0 R06 Laser Line HR 308 >99.5 R07 Laser Line HR 325 >99.5 R08 Laser Line HR 335 >99.5 R09 Laser Line HR 337 >99.5 R11 Laser Line HR 345 >99.5 R12 Laser Line HR 352 >99.5 R13 Laser Line HR 355 >99.5 R14 Laser Line HR 405 >99.5 R16 Laser Line HR 532 >99.5 R26 Laser Line HR 543 >99.5 R28 Laser Line HR 594 >99.5 R30 Laser Line HR >99.5 R33 Laser Line HR >99.5 R36 Laser Line HR >99.5 R42 Laser Line HR >99.5 R45 Laser Line HR 1064 >99.5 R46 Laser Line HR 1550 >99.5 R48 Laser Line HR >99.5 R50 Broadband HR >99.5 avg R52 Broadband HR >99.5 avg R53 Broadband HR >99.5 avg R54 Broadband HR >99.0 avg R55 Broadband HR >99.0 avg R56 Broadband HR >99.0 avg R57 Broadband HR >99.0 avg R58 Broadband HR >99.5 avg R59 Broadband HR >99.0 avg R60 Broadband HR >99.5 avg R61 Broadband HR >99.0 avg R62 Broadband HR >99.0 avg R66 Broadband HR >99.0 avg R67 Enhanced Silver >97.5 avg R77 Protected Silver >96.0 avg R78 Protected Gold 650-IR >96.0 avg R79 UV Enhanced Aluminum >85.0 avg R87 Enhanced Aluminum >94.0 avg R88 Protected Aluminum >88.0 avg R89 28

16 Custom Optical THIN FILM COATINGS Anti-Reflection High, partial, and anti-reflection Edge, notch, band pass filters Plate and cube beam splitters Wavelength ranges nm Sizes up to 10 x 10 inches Various angle of incidence and polarization requirements OptoSigma and customer furnished materials Optical glasses, crystals, polymers, fibers, fiber assemblies, and cemented substrates Custom Here at OptoSigma we specialize in custom optical coatings from the ultra-violet to the near infrared. Every day we provide a variety of custom coatings from simple modifications of the catalog specifications to entirely specialized designs. If the custom coating design is straightforward, we will perform a single test run immediately before the production run. For more complicated designs, a development process will be needed to establish the specifications which can be met in a production environment. This could potentially include multiple test runs, design modifications, and data analysis. We work closely with our customers through every step in the process to determine which specifications are suitable for both their applications and a manufacturing environment. It is in the best interest of OptoSigma and our customers to get through the development stage and on to production as quickly as possible. Once production is reached, the specialized processes and inspection are documented and established to ensure ongoing success. 29

17 Anti-Reflection Custom Most of our coatings are deposited using a computer controlled electron beam ion assisted deposition process allowing us to provide durable precision all dielectric coatings. Before coating, the substrates are ion cleaned to decrease surface contamination, which helps the coating bind to the substrate. During coating, these energetic ions help densify the coating which both increases the coatings optical performance and reduces the internal stress thus increasing the durability. Because of this process, we are able to maintain a temperature of less than 100 C to accommodate temperature sensitive substrates, such as optical fibers, fiber assemblies, crystals, select polymers, and cemented optics. Additionally, each chamber is equipped with a Polycold system to aid in the pumping of water vapor, which decreases the time required to coat and helps eliminate the moisture within the coating. The coating process is completely computer controlled and monitored by a technician. The final product is an extremely dense durable precision coating. The substrates are mounted on a planetary system, where each planet measures 15 inches in diameter. In addition to the availability of a wide range of tooling, we have the ability to both aid the customer in the designing process, or to provide complete custom tooling to accommodate their parts. Durability/Low Stress with a high internal stress have a tendency to craze and delaminate or deform the substrate increasing the wavefront error. Our ion assisted process minimizes this stress within each coating layer, and our designs are created to balance the stress over the entire coating. The ion cleaning process prior to coating enhances the adhesion of the coating to the substrate, increasing the durability and longevity of the coating. During coating, the ion bombardment minimizes internal stress build up by increasing the homogeneity within the layers. The final product is an extremely durable coating which maintains the original substrate wavefront error. High Damage To produce a coating, which can withstand high levels of incident laser energy, the appropriate design and process must be used. Our ion assisted deposition process produces coatings which are highly homogeneous, dense and completely oxidized. Reducing the inhomogenaities minimizes the internal scattering and increases the thermal conductivity of the coating. Our designs for high damage use all oxides rather than fluorides and metals which reduce the amount of absorption within the coating. Temperature Sensitive Substrates The energy required to produce highly homogeneous and dense coatings comes from our ion assisted process rather than temperature. During our coating runs we can maintain a temperature below 100 C. This allows us to produce precision coatings on a variety of temperature sensitive substrates, such as polymers, optical fibers, fiber assemblies, cemented substrates, and a variety of specialized crystals. If you do not find the coating specifications you need in our catalog, please call with your request. 30

18 Broadband All Dielectric THIN FILM COATINGS Anti-Reflection All dielectric multi-layer coatings are much more durable and of higher optical performance that those which involve metals. These can be offered with almost zero absorption and reflectivities greater than 99%. The all dielectric design is limited to a specific spectral bandwidth around the center design wavelength. Large bandwidth requirements demand the use of high precision coatings. These types of coatings are performed regularly at OptoSigma. Two actual spectral curves demonstrating this type of coating can be seen in the following plots. Anti-Reflection Specifications Tolerances Custom Substrate material: BK7 Grade A Angle of incidence: 0 degrees %R <0.3: nm High Reflector Specifications Tolerances Substrate material: BK7 Grade A Wide Angle Particular applications demand the use of all dielectric coatings due to their durability and superb optical performance. The all dielectric design is however highly sensitive to angular variation, which can create problems for broadband applications involving large angular variations, such as those with non-collimated beams or rotating substrates. To accommodate the need for angular variation, a coating bandwidth substantially greater than the source bandwidth is required. This requires a highly precise all dielectric coating. Two actual spectral curves demonstrating our capabilities follow. Angle of incidence: 0 degrees %R ave >97.0: nm Reflector Specifications Tolerances Substrate material: BK7 Grade A Angle of incidence: 40±15degrees %R ave >98.0: nm Cube Specifications Tolerances Substrate material: BK7 Grade A Angle of incidence: 45±5degrees %T p >98: 780nm %T s <1.0: 780nm 31

19 Anti-Reflection Custom Filters Many standard types of custom filters, such as short wave pass, long wave pass, multiple notch, and band pass filters are manufactured at OptoSigma. In addition, a variety of highly customized coatings which do not fall into a general category are produced regularly at OptoSigma. Our engineers design to the specific targets established by our customers needs. The designs are then tested in our chambers and we work closely with our customers to arrive at a final manufacturable coating. Two actual spectral curves demonstrating our capabilities follow. Specifications Tolerances Substrate material: BK7 Grade A Angle of incidence: 45 degrees %T <3.0: 532nm %T >85: 488, 632.8, and 1064nm Specifications Tolerances Substrate material: BK7 Grade A Angle of incidence: 0 degrees Region 1: %T <5.0: nm Region 2: %T >90: 590nm Region 3: %T = 20±10: 670nm Region 4: %R >99.0: 1064nm If you do not find the coating specifications you need in our catalog, please call with your request. 32

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