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Products / Cold Mirror Filters / CM-618
CM-618 spectral response — original published curveOpen full-size image ↗
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Cold Mirror Filters

CM-618Cold Mirrors

CM-618 is a near-infrared longpass / cold-mirror filter. A high-transmission region is shown at approximately 628-1200 nm. Consider it when you need to pass longer wavelengths and reduce shorter-wavelength light within the measured range.

  • Product family: Cold Mirrors
  • Measured wavelength range: 300–1200 nm
  • Published response: Transmittance

Measured interval is not the passband. Values shown are sample measurements. Final specifications are agreed for your order.

MEASURED OPTICAL RESPONSE

Read the light.

Original published sample data.

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Nearest measured point shown; no interpolation or extrapolation. Original sample values are preserved, including values outside 0–100%. Samples are selection references, not production acceptance limits.

OPTICAL PERFORMANCE · CM-618

Read the numbers.
Understand the response.

Measured wavelength range

300-1200 nm. Performance outside this measured interval is not established by this curve.

Selected regions at or above 80% transmission

628-1200 nm. Approximate measured intervals.

Selected regions at or below 5% transmission

300-586 nm. Measured sample intervals; confirm the required blocking for your order.

Peak transmission

Near-unity transmission is indicated, but the measurement baseline requires confirmation before quoting a peak value.

Average measured transmission, 300-600 nm

1.145%. Calculated from the factory sample data.

Average measured transmission, 650-850 nm

98.864%. Calculated from the factory sample data.

Measured edge at 50% transmission

Approximately 616.6 nm. Interpolated absolute-transmission crossing, checked against the factory summary.

These values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.

OPERATING CONDITIONS

Match the complete optical system.

Match the full source band.

Compare the source emission spectrum with the filter curve. Include the source bandwidth, rather than relying on the nominal wavelength alone.

Check unwanted response.

Compare the complete measured response with your detector sensitivity. Confirm any additional blocking needed for your system.

Define the incidence conditions.

Specify the working angle and whether the beam is collimated or converging. Confirm the required response under those conditions.

Confirm the physical fit.

Provide the available mounting space, required shape, dimensions and thickness. Physical specifications will be confirmed for your assembly.

APPLICATIONS

Where this profile can help.

Medical & Microscopy

Optical components for illumination and instrument development.

Security & Surveillance

Visible and infrared optical paths for monitoring systems.

Stage, Studio & Projection

Color, patterns and beam control for performance and projection.

Research & Instrumentation

Spectral selection, beam paths and measurement systems.

Application examples are starting points for evaluation; suitability depends on the complete optical system.

CUSTOM & ENQUIRY

Tell us what
your design needs.

Start with CM-618 and discuss the spectral response, physical format and operating conditions.

Include in your enquiry

  • Target wavelengths and required transmission or blocking
  • Light source and detector model, or their spectra
  • Working angle, beam geometry and operating environment
  • Required shape, dimensions, thickness and mounting constraints
  • Sample quantity, expected order quantity and project timing

TECHNICAL RESOURCES

Take the data
into your design.

CM-618 spectrum data CSV ↓KUPO Optics catalog Download ↗Explore Cold Mirror Filters →