艾里斑

When light from a point source passes through a small circular aperture, it does not produce a bright dot as an image, but rather a diffuse circular disc known as Airy's disc surrounded by much fainter concentric circular rings. This example of diffraction is of great importance because the eye and many optical instruments have circular apertures. If this smearing of the image of the point source is larger that that produced by the aberrations of the system, the imaging process is said to be diffraction-limited, and that is the best that can be done with that size aperture. This limitation on the resolution of images is quantified in terms of the Rayleigh criterion so that the limiting resolution of a system can be calculated.

F-number

Enhance your spotlight or tungsten lamp with our Large Glass Fresnel Lens, available in 200mm, 250mm, and 300mm sizes. Crafted from durable glass, ...

Shortpass edge filters play an important part in many imaging and photometry devices, and can be very helpful in eliminating distortion by blocking large ranges of unwanted light;. For instance, one common use is as a hot mirror, blocking undesirable infrared radiation. These filters are important in Raman spectroscopy and fluorescence microscopy. Shortpass filters can also be used in combination with longpass filters to form bandpass filters. The filters are arranged so that radiation passed through one filter enters the other, and thus both high and low wavelength ranges are eliminated and the filter combination will transmit only the desired passband.

A well designed shortpass filter will have a steep cut-off, and above the cut-off wavelength light will be effectively blocked. Almost 100% of light shorter than the cut-off wavelength will be transmitted without change. These ranges are referred to as the rejection and transmission ranges of the shortpass filter.

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Airydisk formula

While shortpass filters are able to filter light in either direction, with negligible difference in intensity or spectrum of light transmitted, we recommend that you place your filter with the coated side facing the light source. Not only will this eliminate the risk of thermal damage to your filter, it will also decrease any thermal effects that might be caused by intense out-of-band-radiation.

Rayleigh criterion

Oct 27, 2022 — The resolving power of a lens is measured in line pair per millimeter or lp/mm. It is a measurement of spatial resolution used to calculate ...

Edge filters, including both shortpass and longpass filters, are used to transmit one range of light while blocking or rejecting another. For a shortpass filter the transition point between transmission and rejection is known as the cut-off wavelength: the wavelength at which transmission is at 50%. The cut-off wavelength is the most important specification of a shortpass filter and is given by a simple number, for instance, 600 nm.

The aperture diffraction pattern above was photographed with Fuji Sensia 100ASA slide film and then digitized. With the time exposure necessary to show the side lobes, the central peak was washed out nearly white. The only retouching of the digital image was to paint in the washed out part of the central maximum (Airy's disc). The pinhole was made by placing aluminum foil on a glass plate, sticking a straight pin into the aluminum foil, and then rotating the foil. Several pinholes were made, and this one was the closest to being round.

202314 — The Eyepieces are the last part of the microscope through which the light rays from the light source pass. They participate in the final ...

Airydisk telescope

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.

These Pellicle Beamsplitters are ideally suited to laser sampling. Their versatile mounting and light weight construction make them an effective high-quality ...

Airyfunction

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Diffraction limit

Airydisk FWHM

The C or CS mount to M12 lens adapters are used to mount M12 lenses on a C-mount or CS-mount camera. M12 lenses are cheaper, compacter and have less weight.

SALT. Optics is an Independent Premium Eyewear Brand Committed to Quality Construction and Timeless Design. Instagram ...

These lenses magnify the image at 10X power. The power of the ocular lens multiplied by the objective lens gives the total magnification of the microscope.

What is Polarization? ... Polarization is the process that causes neutral parties to take sides in a conflict. It also causes individuals on either side of the ...

Our standard shortpass filters are commonly used with a normal angle of incidence, although orientation can be changed to fine-tune the cut-off wavelength. As a rule of thumb, for every 45 degree of incidence change the cut-off wavelength will change by 10%.

A shortpass filter is a type of edge filter designed to pass wavelengths of light shorter than a given cut off wavelength while blocking long wavelengths. At Shanghai Optics we manufacture high quality shortpass filters for a wide variety of applications, from medical industry to research to defense. Our filters feature high transmission. They can be used for ultraviolet visible or infrared applications. These filters are designed to perform reliably under a wide range of conditions, and are durable enough to withstand normal handling and cleaning.

Laser seam welding incorporates the spot welding technique, but instead of targeting one area, the spots are welded along a continuous seam. This technique uses ...

At Shanghai Optics we carry a wide range of standard and hard coated shortpass filters in stock, individually and in kits. Our experienced engineering and design team is also available to help you design the ideal filter arrangement for your application. Please contact us to receive a listing of in-stock shortpass filters and to discuss custom options.