功能

• A special filter is an optical device that removes distorted wavefronts and noise from the laser and allows the beam to diverge with clean spherical waves.
• It is used in interferometers and hologram optics to observe wavefronts.
• When combined with a low-aberration achromatic lens, plane waves with a large beam diameter can be obtained.
• The objective lens has a linear stage with a micrometer to adjust the position of the focusing point, and the pinhole has a precision crosshair holder to adjust the position in the plane, allowing the spot light of the laser to pass through the pinhole with good reproducibility.
• The design focuses on stability, so you can avoid problems with loose adjustments during experiments.
• The standard pinhole comes with a PA-25 (hole diameter 25 μm).
• The pinhole can be replaced according to the spot diameter of the laser.
• The coarse motion type (SFB-16DMRO) has a high resolution for pinhole (XY) adjustment, allowing precise adjustment. In addition, not only the clamp of the adjustment mechanism of the objective lens, but also the coarse screw of the pinhole (XY) can be clamped, and malfunction such as misalignment during the experiment can be prevented.
• Since you can change the mounting position of the objective lens, you can replace it with an objective lens of different magnification according to your purpose.
• When the SFB-16RO and SFB-16DMRO rods are removed, they can be used as plate type special filter holders. *As the distance from the laser to the special filter increases, the diameter of the beam incident on the special filter increases. Therefore, check the combination of the objective lens and pinhole diameter using the value of the incident beam diameter.
• * Fix the pinhole with the non-engraved side facing the screw ring side. If you stop it on the opposite side, the objective lens and the pinhole may interfere and you may not be able to secure enough movement for adjustment.
• * Special filter cannot be used for high power laser or pulse laser.
• * Cannot be used with ultraviolet lasers.
• * When used with a laser in the near-infrared region, the effect of the anti-reflection film cannot be obtained, and the transmittance becomes poor.
• * When replacing the pinhole, remove the objective lens and turn the screw ring of the pinhole. At this time, use a flathead screwdriver, etc., since the steering spanner cannot be used.