
Analyzer, Testing Equipment
61-6881-17 Reflective Neutral Density Filter (Visible・Mounted) φ25mm Transmittance 0.1% MFNDU-25-0.1
Product Description
Product Model: 61-6881-17Product Brand: SIGMAKOKI CO., […]
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Product Details
Product Model: 61-6881-17
Product Brand: SIGMAKOKI CO., LTD.
Features
- This is an ND filter ***d to dim high-power ultraviolet lasers and near-ultraviolet wavelengths.
- Light that does not transmit is not absorbed by the glass, so there is no need to worry about the glass getting hot and breaking.
- Since it is reflected by a metal film, it shows very gentle transmittance wavelength characteristics from ultraviolet to infrared.
- Synthetic quartz is ***d for the substrate, which has a high transmittance of ultraviolet light, and almost the same transmittance can be obtained in the near-ultraviolet to visible light range.
- The thickness of the glass is 2 mm±0.1 mm and is constant regardless of the transmittance.
- * Since chromium film has absorption, it cannot be ***d for high-energy pulsed laser.
- * When a high-power laser is injected into the filter, the beam may focus due to the thermal lens effect.
- * Use a variable beam splitter (VBS) for high power lasers and high energy lasers.
- * The laser beam reflected by the surface of the filter is dangerous.
- * Terminate the reflected beam so as not to irradiate the worker.
- * When the laser beam enters the filter normally, the light reflected by the filter returns to the laser light source.
- * When there is such a return light, the laser oscillation becomes unstable.
- * To prevent the return light from returning to the laser source, tilt the filter slightly.
- * The 92% transmittance filter (FNDU-92, MFNDU-92) is a flat board with no coat on both sides.
- * If the reflectivity of the no-coat surface is 4% (8% on both sides), the transmittance becomes about 92%.
Spec
-
[
common specification]
- Type: for ultraviolet light
- Material: Synthetic quartz
- Coating: Chromium (Cr), However, FNDU-92, FNDU-92 is no coat
- Adaptive wavelength: 200 - 400nm
- Parallelism: <30″
- Surface accuracy: λ (measurement range φ30mm)
- Scratch - dig: 60-40
- Frame: Material: Aluminum surface treatment: Black anodic oxide
- Effective diameter: 90% of the outer element diameter
- [Individual specification]
- Frame outer diameter φD: φ25mm
- Effective diameter φA: φ17mm
- Transmittance (300nm): 0.1%
- RoHS conform product
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