Mirror Specifications

Mirror Sizes: 3mm| 5mm | 8mm | 10mm | 12mm | 15mm | 20mm | 30mm | 50mm

Cambridge Technology offers a wide variety of laser quality first surface mirrors for single and multi-axis applications. All standard mirror substrates are fabricated from either fused silica or silicon, depending on the scanner model. Other substrate materials are available. The standard flatness of all fused silica substrate mirrors is Lambda/4 at 632.8nm. Silicon substrate mirrors have flatnesss ranging from Lambda/4 to Lambda/1 at 632.8nm.  The standard surface quality scratch/dig figure is 40/20. Other surface quality specifications are available, contact a Sales Engineer for more details. CTI mirrors are designed for scanning beam diameters as small as 3mm and as large as 75mm. CTI mirrors are also designed for single and multiple axis configurations. Each galvanometer has a specific mirror set due to the inertia of the mirrors. All CTI mirrors are mounted in a mass balanced configuration for optimum scanning performance. The reflective surface is specified to be parallel with the axis of rotation to within 3 milliradians. All prices include the mirror mounts to couple the mirrors to the appropriate optical scanners and mounting labor. Volume discounting is available.

Cambridge Technology Standard Mirror Coatings

  • S or S1: Protected Silver Coating, 450nm to Far Infrared: Cambridge Technology standard mirrors have a Protected Silver Coating. The coating is 1000 Angstroms of durable low pinhole silver with a reflectance of >90% from 400nm, >94% from 600nm well into the infrared. The damage threshold is between 150-200 watts/cm2.
  • V or V1: Visible Dielectric Coating, 450nm-675nm: Cambridge Technology standard mirrors have a Visible Dielectric Coating. The coating is a high performance, wide band dielectric with >97% reflectivity from 450nm to 675nm. The damage threshold is between 300-400 watts/cm2.
  • A or A1: Protected Aluminum Coating, 200nm to Far Infrared: Cambridge Technology standard mirrors have a Protected Aluminum Coating. The coating is a protected aluminum with a reflectance of >87% from 200nm to 600nm, >82% from 600nm to 1050nm, >91% from 1050nm well into the infrared. The damage threshold is between 100-150 watts/cm2.
  • G or G1: Protected Gold Coating, 650nm to Far Infrared: Cambridge Technology standard mirrors have a Protected Gold Coating. The coating is a protected gold with a reflectance of >85% from 650nm to 800nm, >95% from 800nm to 1200nm, >98% from 1200nm well into the infrared. The damage threshold is between 125-175 watts/cm2.
  • Y or Y1: Nd:Yag High Power Coating, 1064nm: Cambridge Technology Y1 mirrors have a Hard Dielectric Coating. The coating is a high performance, 1064nm wavelength specific electron beam multilayer dielectric reflective coating. For a single axis mirror it has a >99% reflectivity (unpolarized, Rs>99.5%, Rp>98.5% at 45 degree AOI) over +5/-10 deg, >95% reflectivity over +10/-20 deg, >80% reflectivity over +15/-20 deg. In a dual axis system you can expect a >99% reflectivity over ±5 deg, and with >95% ±10 deg, for any polarization. The damage threshold is 10J/cm2 (8nsec pulse), 1MWcm2 continuous wave. Contact Cambridge Technology for damage certification up to 20J/cm2.
  • YA: Nd:Yag High Power Coating with Visible Alignment Band, 1064nm: Cambridge Technology YA mirrors have a Hard Dielectric Coating. The coating is a high performance, 1064nm wavelength specific electron beam multilayer dielectric reflective coating. For a single axis mirror it has a reflectivity an unpolarized beam centered at a 45 degree AOI, mechanical angle as follows: Rs>99.7% over ±5 deg, Rs>99.5% over ±10 deg, Rs>99.2% over ±12.5 deg, Rs>98.8% over ±15 deg, Rs>96.8% over ±20 deg. In a dual axis system you can expect a Rs>99.4% over ±5 deg, Rs>98.9% over ±10 deg, Rs>98.4% over ±12.5 deg, Rs>97.4% over ±15 deg. The damage threshold is 6J/cm2 (10nsec pulse), 1.5MWcm2 continuous wave. There is an alignment band at 633nm and 670nm with a reflectivity of >85% at an AOI of 45 degrees, for a dual axis system the total reflectivity is >73%.
  • Y2: Doubled Nd:Yag High Power Coating, 532nm: Cambridge Technology Y2 mirrors have a Hard Dielectric Coating. The coating is a high performance, 532nm wavelength specific electron beam multilayer dielectric with >99% reflectivity over ±15 deg for a single axis mirror (unpolarized, Rs>99.5%, Rp>98.5% at 45 degree AOI) . In a dual axis system you can expect a >99% reflectivity over ±5 deg, and with >96% ±10, and with >93% ±12.5, unpolarized. The damage threshold is 4J/cm2 (8nsec pulse), 0.2MW/cm2 continuous wave. Contact Cambridge Technology for damage certification up to 7J/cm2.
  • Y3: Tripled Nd:Yag High Power Coating, 355nm: Cambridge Technology Y3 mirrors have a Hard Dielectric Coating. The coating is a high performance, 355nm wavelength specific electron beam multilayer dielectric with >99% reflectivity (unpolarized, Rs>99.5%, Rp>98.5% at 45 degree AOI) over ±15 deg for a single axis mirror. In a dual axis system you can expect a >99% reflectivity over ±5 deg, and with >96% ±10, and with >93% ±12.5, unpolarized. The damage threshold is 4J/cm2 (8nsec pulse), 0.2MW/cm2 continuous wave. Contact Cambridge Technology for damage certification up to 7J/cm2.
  • YC: Tripled Nd:Yag High Power Coating with Visible Alignment Band, 355nm: Cambridge Technology YC mirrors have a Hard Dielectric Coating. The coating is a high performance, 355nm wavelength specific electron beam multilayer dielectric with >99% reflectivity (unpolarized, Rs>99.5%, Rp>98.5% at 45 degree AOI) over ±15 deg for a single axis mirror. In a dual axis system you can expect a >99% reflectivity over ±5 deg, and with >96% ±10, and with >93% ±12.5, unpolarized. The damage threshold is 2J/cm2 (8nsec pulse), 0.1MW/cm2 continuous wave. There is an alignment band at 633nm and 670nm with a reflectivity of >70% at an AOI of 45 degrees.
  • C or C1: CO2 High Power Coating, 10.6um: Cambridge Technology C1 mirrors have a Hard Dielectric Coating. The coating is a high performance, 10.6um wavelength specific multilayer dielectric with >99% reflectivity over ±20 deg, all polarizations. Actual AOI for reflectivity of >99% is from zero degrees to 75 degrees. The damage threshold for continuous wave is between 2kW-5kW per cm2 at 10.6um, with a maximum average power of 1kW/cm2. The damage threshold for a pulsed laser is 1-2J/cm2 (120nsec pulse, 5kHz rep rate) with a maximum average power of 1kW/cm2. Contact Cambridge Technology for damage certification up to 10kW/cm2 and for special custom coatings for pulsed applications with damage thresholds up to 18J/cm2.
  • C2: CO2 High Power Coating with Visible Alignment Band, 9.4um: Cambridge Technology C2 mirrors have a Hard Dielectric Coating. The coating is a high performance, 9.4um wavelength specific multilayer dielectric with >99% reflectivity over ±20 deg, all polarizations. Actual AOI for reflectivity of >99% is from zero degrees to 75 degrees. The damage threshold for continuous wave is between 2kW-5kW per cm2 at 9.4um, with a maximum average power of 1kW/cm2. The damage threshold for a pulsed laser is 1-2J/cm2 (120nsec pulse, 5kHz rep rate) with a maximum average power of 1kW/cm2. Contact Cambridge Technology for damage certification up to 10kW/cm2 and for special custom coatings for pulsed applications with damage thresholds up to 18J/cm2.
  • CA: CO2 High Power Coating with Visible Alignment Band, 10.6um: Cambridge Technology CA mirrors have a Hard Dielectric Coating. The coating is a high performance, 10.6um wavelength specific multilayer dielectric with >99% reflectivity over ±20 deg, all polarizations. Actual AOI for reflectivity of >99% is from zero degrees to 75 degrees. The reflectance at 633nm > 70%. The damage threshold for continuous wave is between 2kW-5kW per cm2 at 10.6um, with a maximum average power of 1kW/cm2. The damage threshold for a pulsed laser is 1-2J/cm2 (120nsec pulse, 5kHz rep rate) with a maximum average power of 1kW/cm2. Contact Cambridge Technology for damage certification up to 10kW/cm2 and for special custom coatings for pulsed applications with damage thresholds up to 18J/cm2.
  • E or E1: Excimer 248nm High Power Coating, 248nm: Cambridge Technology E1 mirrors have a Hard Dielectric Coating. The coating is a high performance, 248nm wavelength specific electron beam multilayer dielectric with >99% reflectivity over ±15 deg for a single axis mirror. In a dual axis system you can expect a >99% reflectivity over ±5 deg, and with >96% ±10, and with >93% ±12.5, unpolarized. The damage threshold is 3J/cm2 (8nsec pulse). Contact Cambridge Technology for damage certification up to 8J/cm2.
  • Mirror Substrates: Cambridge Technology models 6210, 6220, 6230 ,6231C and 6240>mirrors have mirror substrates made of crystalline silicon. These have a standard flatness of lamda/1 at 632.8nm and a standard surface quality scratch and dig figure of 40/20. Mirrors with a flatness of lamda/4 at 632.8nm are available as a special order. The 6210, the 6220 and all other scanners have mirrors with substrates made of fused silica and have a standard flatness of lamda/4 at 632.8nm and a standard surface quality scratch and dig figure of 40/20.
  • Special Specifications for the Model 6200, 6210 and 6800HP: Cambridge Technology standard mirrors for the Model 6200, 6210, and 6800HP can have either a Protected Silver or a Visible Dielectric Coating. The Protected Silver Coating is 1000 Angstroms of durable low pinhole silver with a reflectance of 90% from 400nm, >94% from 600nm well into the infrared. The Dielectric Coating is a high performance, wide band dielectric with >97% reflectivity from 450nm to 675nm. Both mirrors have a standard flatness of lambda/1 at 632.8nm and a standard surface quality scratch and dig figure of 40/20. The damage threshold is between 100-150 watts/cm2 for the silver coating and between 200-300 watts/cm2 for the visible dielectric coating. Other coatings as described above are available by special order and have similar performance as described above. The substrates are of fused silica.

Mirror Replacement:

The mirrors can be removed from the Model 6200 6210 and 6800HP scanners with care. Place the tip of a soldering iron where the glue joint bonds the mirror to the rotor shaft. When the glue softens gently pull the mirror out of the shaft. Generally the mirror is destroyed doing this. Care must be used in applying as small amount of heat as is needed to soften the glue. There is always a possibility in damaging the scanner. Too much heat will demagnetize the permanent magnet which is part of the rotor assembly. If this occurs costly repairs will be required for the scanner.

Galvos from Cambridge Technology Copyright © 2008 All rights reserved