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High powerobjective lens

There have been extensive debates on laser safety issues associated with laser pointers. Typical output powers are a few milliwatts – normally below 5 mW in order to comply with safety class 3R, and sometimes below 1 mW for class 2. Direct staring into a 1-mW beam can be irritating for the eye: it can cause temporary flash blindness. However, one would normally not do that long enough to cause serious eye damage. Nevertheless, great care should be taken, e.g. when children are playing with laser pointers, if laser pointers are at all considered to be suitable as toys. Significant hazards could arise e.g. if somebody walking down stairs or a car driver is irritated by a laser beam.

MXPLFLN objectives add depth to the MPLFLN series for epi-illumination imaging by offering a simultaneously improved numerical aperture and working distance.

What are the 3objectivelenseson a microscope

The apparent brightness of the illuminated spot depends strongly on the wavelength of the emitted light. Most devices operate in the red spectral region, where the sensitivity of the eye rapidly decreases with increasing wavelength. Devices with 650-nm output appear about twice as bright as those emitting the same power at 670 nm, and 635-nm devices still about two times brighter. However, the shorter-wavelength laser pointers are typically more expensive. This is particularly true for green lasers, which are significantly brighter than their red counterparts, but are still expensive. They involve a diode-pumped solid-state laser and a frequency doubler. Due to the typically poor conversion efficiency of the frequency doubler at low power levels, hundreds of milliwatts of infrared (typically 1064-nm) light are required for generating a few milliwatts in the green, and the batteries will accordingly not last very long, unless they are comparatively heavy.

A typical use of a hand-held laser pointer is to point at some screen or chart during a presentation, e.g. a conference talk, in order to direct the viewer's attention to certain points. This is convenient because it can be done from a large distance and requires only a small hand-held device. However, the visibility of the generated spot on the screen is often poor (particularly for red laser pointers with relatively long emission wavelength), and a fast-moving light spot can have a somewhat nervous appearance. Therefore, some people prefer an old-fashioned telescopic pointing device for presentations.

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To clean a microscope objective lens, first remove the objective lens and place it on a flat surface with the front lens facing up. Use a blower to remove any particles without touching the lens. Then fold a piece of lens paper into a narrow triangular shape. Moisten the pointed end of the paper with small amount of lens cleaner and place it on the lens. Wipe the lens in a spiral cleaning motion starting from the lens’ center to the edge. Check your work for any remaining residue with an eyepiece or loupe. If needed, repeat this wiping process with a new lens paper until the lens is clean. Important: never wipe a dry lens, and avoid using abrasive or lint cloths and facial or lab tissues. Doing so can scratch the lens surface. Find more tips on objective lens cleaning in our blog post, 6 Tips to Properly Clean Immersion Oil off Your Objectives.

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Some laser pointers, as shown in Figure 1, emit green or even blue or yellow light. Some of them are based e.g. on directly green- or blue-emitting laser diodes. Others, which are significantly more expensive, contain a small diode-pumped solid-state laser with a nonlinear crystal for frequency doubling. Green laser pointers are often based on a miniature Nd:YVO4 laser with a KTP crystal for intracavity frequency doubling. Here, Nd:YVO4 is beneficial for a low threshold pump power, and KTP works in a relatively wide temperature range, thus not requiring means for temperature stabilization.

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Objective lensfunction

MXPLFLN-BD objective lenses add depth to the MPLFLN series for epi-illumination imaging by offering simultaneously improved numerical aperture and working distance.

Many microscopes have several objective lenses that you can rotate to view the specimen at varying magnification powers. Usually, you will find multiple objective lenes on a microscope, consisting of 1.25X to 150X.

MicrometerThis product may not be available in your area.View ProductMPLAPON Our MPLAPON plan apochromat objective lens series provides our highest level of chromatic correction and resolution capability, along with a high level of wavefront aberration correction. View ProductMPLAPON-Oil Our MPLAPON-Oil objective is a plan apochromat and oil immersion lens that provides our highest level of chromatic correction and resolution capability. The numerical aperture of 1.45 offers outstanding image resolution. View ProductMXPLFLN MXPLFLN objectives add depth to the MPLFLN series for epi-illumination imaging by offering a simultaneously improved numerical aperture and working distance. View ProductMXPLFLN-BD MXPLFLN-BD objective lenses add depth to the MPLFLN series for epi-illumination imaging by offering simultaneously improved numerical aperture and working distance. View ProductMPLN Our MPLN plan achromat lens series is dedicated to brightfield observation and provides excellent contrast and optimal flatness throughout the field of view. View ProductMPLN-BD Our MPLN plan achromat lens series is designed for both brightfield and darkfield observation and provides excellent contrast and optimal flatness throughout the field of view. View ProductMPLFLN The MPLFLN objective lens has well-balanced performance with a semi-apochromat color correction, a fair working distance, and a high numerical aperture. It is suitable for a wide range of applications. View ProductMPLFLN-BD The MPLFLN-BD objective lens has semi-apochromat color correction and suits a wide range of industrial inspection applications. It is specially designed for darkfield observation and examining scratches or etchings on polished surfaces. View ProductLMPLFLN Our LMPLFLN lens is part of our plan semi-apochromat series, providing longer working distances for added sample safety and observation with increased contrast. View ProductLMPLFLN-BD Our LMPLFLN-BD brightfield/darkfield objective lens is part of our plan semi-apochromat series, providing longer working distances for added sample safety and observation with increased contrast. View ProductSLMPLN The SLMPLN plan achromat objective lens offers an exceptionally long working distance and the image clarity that you expect from the Olympus UIS2 optical system. It is ideal for electronic assembly inspection and other similar applications. View ProductLCPLFLN-LCD The LCPLFLN-LCD objective lenses are optimal for observing samples through glass substrates, such as LCD panels. The adoption of optical correction rings enables aberration correction according to glass thickness. View ProductLMPLN-IR/LCPLN-IR Our LMPLN-IR and LCPLN-IR plan achromat lenses have a long working distance and are specifically designed for optimal transmission in the near-infrared region (700–1300 nm wavelengths). View ProductWhite Light Interferometry Objective Lens This objective lens is designed for the Mirau style of white light interferometers and maintains a high level of temperature tolerance. The optimized numerical aperture of 0.8 provides improved light gathering, with a working distance of 0.7 mm. View Product

High powerobjective microscopefunction

Objective lens microscopefunction

Olympus microscope objective lenses for industrial inspections offer outstanding optical performance from the visible light to near-infrared region. At Evident, we offer an extensive selection of Olympus objectives suited to specific inspection requirements and tasks. Our MXPLFLN-BD objective is designed for darkfield observation and examining scratches on polished surfaces, while our SLMPLN objective is ideal for electronic assembly inspection. Find your ideal microscope objective today for your inspection task. No matter your requirements, Olympus objective lenses have you covered.

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The ocular lens is located at the top of the eyepiece tube where you position your eye during observation, while the objective lens is located closer to the sample. The ocular lens generally has a low magnification but works in combination with the objective lens to achieve greater magnification power. It magnifies the magnified image already captured by the objective lens. While the ocular lens focuses purely on magnification, the objective lens performs other functions, such as controlling the overall quality and clarity of the microscope image.

A laser pointer is a small (usually battery-powered) laser device designed for pointing at objects by illuminating them with a collimated visible laser beam. Most laser pointers, particularly the cheap ones, contain a small GaInP/AlGaInP laser diode operating somewhere in the red spectral region, a collimating lens, a simple electronic diode driver, and a battery compartment for e.g. three coin cells.

Objective lens on a microscopemeaning

Objective lenses are responsible for primary image formation, determining the quality of the image produced and controlling the total magnification and resolution. They can vary greatly in design and quality.

Lay persons often ask what is the range of a laser pointer is, and responding to this interest some producers specify some questionable numbers.

Laser pointers should not be confused with lamps containing light-emitting diodes (LEDs), which emit a much more diffuse beam (with much lower spatial coherence, similar to that of an incandescent lamp) and can also emit light with different colors, or white light. In contrast to that, laser points usually emit quasi-monochromatic light.

Types ofobjectivelenses

Objective lensmagnification

In principle, laser pointers can be used for alignment purposes. However, there are special alignment lasers which may be better suited for such applications. For example, they have a housing which can be more conveniently mounted, and the beam direction may be more stable.

The range of a laser pointer may also be understood as the maximum distance from which the spot on the screen can be seen. That kind of range is normally not limited by the beam divergence but by the overall optical power (apart from the wavelength and level of ambient light), since the issue is not the comparatively minor divergence on the way from the laser pointer to the screen, but rather the huge divergence of the scattered light on the way back. Therefore, someone standing next to the illuminated screen would easily see the spot when it is already hardly perceivable from the position of the laser pointer.

If the question is meant to be how far the light of a laser pointer can propagate, the correct answer is that there is no limit, provided that the light is not absorbed or scattered away in the atmosphere. However, the beam area will eventually become larger due to the beam divergence, so that the intensity e.g. on a screen will be reduced even if the overall power remains constant. Accordingly, an airplane pilot looking down into such a beam from an altitude of 10 km will not be disturbed by the remaining small intensity. (Exposure on a smaller distances could be quite problematic.)

Edmund Optics offers a wide range of industrial and pointing lasers with different colors (red, green, violet, infrared). Some are handheld devices, while others come with cylindrical houses for easy integration.

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There are some reports saying that cheap green laser pointers are sold which do not have a filter to eliminate the infrared light, and therefore can emit hundreds of milliwatts in the infrared spectral region. This is obviously a terrible safety hazard; an eye directly hit by such a beam could be destroyed within a fraction of a second.