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Part Number |
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T>90%@830-950nm+R>95%@1010-1200nm Shortpass Dichroic Mirror(SPDM920)
SO3060347
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This SPDM920 shortpass dichroic mirror is designed to transmit near-infrared (NIR) light from 830–950 nm while reflecting longer infrared wavelengths from 1010–1200 nm.
It is suitable for laser beam combining and NIR sensing applications, particularly those involving 1064 nm Nd:YAG or Ytterbium fiber lasers. It helps separate beams by wavelength, effectively allowing the shorter 900 nm range signals to pass through while reflecting the 1-micron laser lines, making it an excellent choice for protecting sensitive detectors or merging different NIR sources into a single optical path.
Key specifications:
- Wavelength / main spec: Transmits 830–950 nm; Reflects 1010–1200 nm
- Bandwidth / transition spec: Shortpass dichroic transition between 950 nm and 1010 nm
- Transmission / blocking: T >90% (830–950 nm); R >95% (1010–1200 nm)
- Format / custom option: Available in mounted (dia 12.5–25 mm) and unmounted (25x36 mm to 35x52 mm) formats
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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.