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Part Number |
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T>90%@340-390nm+R>99%@410-680nm Shortpass Dichroic Mirror(SPDM)
SO3060637
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This SPDM shortpass dichroic mirror is engineered to transmit ultraviolet (UV) light while providing high-efficiency reflection across nearly the entire visible spectrum.
It is an essential component for applications requiring precise UV isolation, such as UV fluorescence excitation, lithography, or laser steering of 355 nm sources. The mirror effectively passes the UV band (340–390 nm) while reflecting blue, green, and red wavelengths (410–680 nm) with extreme efficiency. This ensures that visible background noise or secondary laser lines are removed from the optical path, providing a clean UV signal for sensitive detectors.
Key specifications:
- Wavelength / main spec: Shortpass transition optimized for UV transmission and Visible reflection.
- Bandwidth / transition spec: Transmits 340–390 nm; Reflects 410–680 nm.
- Transmission / blocking: T >90% at 340–390 nm; R >99% at 410–680 nm.
- Format / custom option: Available in mounted (dia 12.5–25 mm) and unmounted (25x36–35x52 mm) formats; custom sizes available on request.
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Product Faqs
What does a dichroic mirror do?
A dichroic mirror separates light by wavelength. It is designed to reflect one wavelength range while transmitting another wavelength range.
For example, a dichroic mirror may reflect a laser wavelength while transmitting a visible alignment beam, fluorescence signal, or another laser wavelength. The exact function depends on the reflection band, transmission band, and angle of incidence.
What angle of incidence should I use?
Most dichroic mirrors are designed for a specified angle of incidence, commonly 45°, unless otherwise stated.
Can this dichroic mirror be used to combine or separate laser beams?
Yes. Dichroic mirrors are commonly used for laser beam combining and beam separation when the wavelengths are different enough and the reflection/transmission bands match the system requirement.
For example, one wavelength may be reflected at 45°, while another wavelength passes through the mirror. Before ordering, please confirm the laser wavelengths, AOI, beam size, and required reflection/transmission performance.
Not sure if this product fits your setup?
Whether you are replacing an existing part or building a new system, send us:
- Original part number or target specification
- Required size and quantity
- Application or system goal
We will help check product fit or suggest a stock/custom alternative.