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Partial Reflectors/Output Couplers for CO2 Laser Systems
Partial reflectors are commonly used as laser output couplers or beam attenuators.
For your convenience, II-VI maintains commonly used coatings and substrate radii of curvature in inventory. Specifications for these products are indicated on this page. For available special substrate sizes and coatings, please contact a II-VI sales representative for a quotation.
Laser output couplers often require a slightly wedged substrate to eliminate interference from multiple reflections inside the component. If you require a specific wedge value, please specify this when ordering.
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Standards
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Dimensional Tolerances
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Diameter
Thickness (plano)
Thickness (radiused)
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+0.000”-0.005”
+0.005”-0.010”
+/-0.010”
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Parallelism
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Plano
Radiused, Diameter < 1”
Radiused, Diameter >= 1”
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<= 3 arc minutes
<= 10 arc minutes
<= 5 arc minutes
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Clear Aperture (polished)
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90% of diameter
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Surface Figure (power/irregularity) at 0.63µm
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Plano
Radiused
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1 fringe/0.5 fringe
(varies depending upon radius)
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Surface-Dig
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20-10
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Side 1: Reflectivity Tolerance at 10.6µm
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1% to 5%: ±0.5%xR
6% to 85%: +3%
86% to 95%: +1.5%
96% to98%: +1%
99%: +0.2%
99.5%: +0.2%
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Side 2: AR Coating Reflectivity at 10.6µm
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<= 0.20%
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988175
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774314
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132098
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346822*
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554288
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187879
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120765
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697996
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903007
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*MP-5 type coating
**M is meter, CC is concave, CX is convex, PO is plano
Contact a II-VI sales representative for exact specifications.
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Rear Mirrors for CO2 Laser Systems
Rear mirrors, typically GaAs, Ge, or ZnSe, are partial reflectors with a very high reflection-to-transmission ratio (99.0% to 99.7%), and are key optical components in laser resonators or laser cavities. Rear mirrors, like output couplers, are a part of the lasing process. Thus, high reflectivity is desired. The rear mirrors slight transmission is used in conjunction with power meters to test for laser resonator output power.
When laser resonator designs require rear mirrors to be total reflectors, Si, Cu, or Mo substrates are used, the latter being typically uncoated.
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Standards
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Dimensional Tolerances
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Diameter
Thickness (plano)
Thickness (radiused)
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+0.000”-0.005”
+0.005”-0.010”
+/-0.010”
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Parallelism
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Plano
Radiused, Diameter < 1”
Radiused, Diameter >= 1”
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<= 3 arc minutes
<= 10 arc minutes
<= 5 arc minutes
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Clear Aperture (polished)
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90% of diameter
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Surface Figure (power/irregularity) at 0.63µm
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Plano
Radiused
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1 fringe/0.5 fringe
(varies depending upon radius)
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Surface-Dig
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20-10
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Side 1: Reflectivity Tolerance at 10.6µm
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99%: ±0.2%
99.5%: +0.2/-0%
99.7%: +1/±0.1%
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Side 2: AR Coating Reflectivity at 10.6µm
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<= 0.20%
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234709
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722287
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447118
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432529
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347102
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766409
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536364
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230089
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911209
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*M is meter, CC is concave, PO is plano
Contact a II-VI sales representative for exact specifications.
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Band-Selective Resonator Optics for CO2 Laser Systems
Most CO2 lasers operate in the wavelength band at 10.6µm. This wavelength band is fine for cutting steel and certain other materials; however, other industrial laser applications -- such as plastics processing -- need a different, specific wavelength band for maximum production efficiency.
II-VI’s band-selective resonator optics effectively “lock” a CO2 laser to a specific wavelength band for specialized industrial applications, such as the 9.3µm band for circuit board drilling and plastics marking.
Our band-selective resonator optics are designed for both standard CO2 gas mixes and isotope fills.
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