Difference betweenresolutionand resolvingpowerin microscope

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resolving power中文

Plane Gratings for laser tuningLaser tuning gratings are holographic gratings specially designed for wavelength tuning of lasers, such as dye lasers, Ti-sapphire, or external cavity diode lasers. The groove depth is optimised to yield maximum efficiency for one state of polarisation.

…be capable of a seven-point resolution of the image, which raises the problem of incorporating multiple inverted images into a single erect image that the ordinary apposition eye avoids. In 1967 German biologist Kuno Kirschfeld showed that the angles between the individual rhabdomeres in one ommatidium are the same as…

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The number of ommatidia in apposition eyes varies from a handful, as in primitive wingless insects and some ants, to as many as 30,000 in each eye of some dragonflies (order Odonata). The housefly has 3,000 ommatidia per eye, and the vinegar fly (or…

Resolvingpower

The attainable resolution, or the smallest distance at which two points can be seen as separate when viewed through the microscope, is the first important property. This is generally set by the ability of the eye to discern detail, as well as by the basic physics of…

) The resolution of the VLA is altered by changing the positions of the dishes. The radio signals recorded by the component dishes are integrated by computer to give a resolving power equal to that of a single dish as large as 36 km (22 miles) in…

High efficiencyThe groove depth of these sinusoidal groove gratings, is optimised to give maximum efficiency for TM polarisation (the electric vector perpendicular to the grooves). Depending on the wavelength and configuration, the TM efficiency may be more than 80 %, and in some cases better than 90 % (absolute efficiency).

Spectralresolution

Resolving power is another important feature of a telescope. This is the ability of the instrument to distinguish clearly between two points whose angular separation is less than the smallest angle that the observer’s eye can resolve. The resolving power of a telescope can be…

Massresolution

…can have very high intrinsic resolving powers; in practice, however, these are not attained for telescopes located on Earth’s surface, because atmospheric effects limit the practical resolution to about one arc second. Sophisticated computing programs can allow much-improved resolution, and the performance of telescopes on Earth can be improved through…

Opticalresolution

Grazing incidence Littman gratingsThe grazing incidence, or Littman configuration is the most common configuration for dye laser tuning. No beam expansion is needed; high resolution is accomplished by illuminating the grating in a fixed grazing incidence angle. A flat, tiltable mirror is used for wavelength tuning.

Extremely low stray lightThe holographic masters, used for our dye laser gratings, are fabricated with the same technique as our low stray light gratings. This results in very small amounts of scattered light, comparable to that from a good front surface aluminium mirror.

Resolutionand resolvingpower ofmicroscope

High efficiency diffraction gratings for laser tuningWhen ordering a grating, please use the following example format, or choose from the grating stock list below.

One way of testing lens performance is to observe the image it forms of patterns of increasingly closely spaced black lines separated by white spaces of line width. The closest spacing still recognizable in the image gives a resolving power…

…some way to increase microscope resolution. French physicist Louis de Broglie in 1924 opened the way with the suggestion that electron beams might be regarded as a form of wave motion. De Broglie derived the formula for their wavelength, which showed that, for example, for electrons accelerated by 60,000 volts…

Littrow gratingsThe Littrow mount, or auto collimatlon, is the classical configuration for laser tuning. The laser beam has to be expanded by intracavity optics, in order to fill the grating aperture and obtain high resolution. The Littrow configuration is also often used for external cavity tuning of diode lasers. Especially in the NIR, very high efficiency (>90 %) can be achieved.

Note: The absolute efficiency curves shown are only representative for the stated geometry and wavelength(s) and can vary depending on use geometry and measurement technique.