Mirror Specifications

Mirror Sizes: 3mm| 4mm | 5mm | 6mm | 7mm | 8mm | 10mm | 12mm | 15mm | 20mm | 25mm | 30mm | 50mm | 75mm|

Cambridge Technology offers a wide variety of laser quality first surface mirrors for single and multi-axis applications. Our mirror substrates are fabricated from either fused silica, silicon, beryllium, or silicon-carbide, depending on the application requirements. Our in-house beryllium machining and coating capability offers superior performance now at a cost advantage over commercial beryllium optics suppliers.  The standard flatness of all fused silica substrate mirrors is Lambda/4 at 632.8nm. Silicon substrate mirrors have flatness ranging from Lambda/4 to Lambda/1 at 632.8nm. Other flatness requirements can also be provided upon request.  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.

Cambridge Technology Standard Mirror Coatings

  • S or S1: Protected Silver Coating, 450nm to Far Infrared: 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: Wideband Visible Dielectric Coating, 450nm-675nm:  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, 300nm to Far Infrared:  The coating is a protected aluminum with a reflectance of >87% from 300nm 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: 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.
  • B1: Wideband Dielectric Coating, 750nm - 1100nm.  The coating is a high performance, wide band dielectric with >97% reflectivity from 750nm to 1100nm.
  • Y or Y1: Nd:Yag High Power Coating, 1064nm:  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: 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: 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: 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: 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: 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: 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: 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: 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 Replacement:

3mm and 4mm mirrors can be removed from the Model 6200H 6210H 6215H 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. Contact Cambridge Technology for detailed mirror replacement and cleaning procedures.

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