Technical Notes

Focusing and Collimating

 

Technical Notes

As a first example, we look at a common application, the focusing of a laser beam to a small spot. The situation is shown in Figure 5. Here we have a laser beam, with radius y1 and divergence θ1 that is focused by a lens of focal length f. From the f...

Gaussian Beam Optics

 

Technical Notes

The Gaussian has no obvious boundaries to give it a characteristic dimension like the diameter of the circular aperture, so the definition of the size of a Gaussian is somewhat arbitrary. Figure 1 shows the Gaussian intensity distribution of a typica...

Fiber Optic Coupling

 

Technical Notes

The problem of coupling light into an optical fiber is really two separate problems. In one case, we have the problem of coupling into multimode fibers, where the ray optics of the previous section can be used. In the other case, coupling into single...

Beam Shaping with Cylindrical Lenses

 

Technical Notes

Cylindrical Lenses focus or expand light in one axis only. They can be used to focus light into a thin line in optical metrology, laser scanning, spectroscopic, laser diode, acousto-optic, and optical processor applications. They can also be used to ...

Optics Formulas

 

Technical Notes

Light is a transverse electromagnetic wave. The electric E and magnetic M fields are perpendicular to each other and to the propagation vector k, as shown below. Power density is given by Poynting’s vector, P, the vector product of E and H. You can e...

Optical Materials

 

Technical Notes

Newport offers a wide variety of spherical and aspherical lenses made from BK 7, UV grade fused silica, Infrared grade Calcium Fluoride (CaF2), Magnesium Fluoride (MgF2), AMTR and Zinc Selenide materials. For applications in the visible and infrared ...

Polarization

 

Technical Notes

The interaction of light with the atoms or molecules of a material is wavelength dependent. A consequence of this dependence is the resonant interactions related to material dispersion. Another consequence of such resonant interaction is birefringenc...

How to Clean Optics

 

Technical Notes

Dust and stains on Optics can cause scattering, and impurities on the optic surface can react with incident laser light to damage optical coatings. With proper handling and cleaning of your optics, you can prevent damage and ensure their continued pe...

Linear Translation Stage Terminology

 

Technical Notes

This glossary covers important terms related to linear translation stages.

Optical Surfaces

 

Technical Notes

The lens application drives the requirements for surface irregularity and surface quality. When preservation of wavefront is critical, λ/4 to λ/8 irregularity should be selected; when wavefront is not as important as cost, λ/2 irregularity can be use...

Optics Fundamentals

 

Technical Notes

By ideal thin lens, we mean a lens whose thickness is sufficiently small that it does not contribute to its focal length. In this case, the change in the path of a beam going through the lens can be considered to be instantaneous at the center of the...

Motion Basics Terminology & Standards

 

Technical Notes

The function of a stage is to constrain motion to a desired direction. For a linear stage, the desired motion is along an ideal straight line. Any motion in a constrained direction will contribute to deviation from the ideal trajectory and/or positio...

Introduction to FTIR Spectroscopy

 

Technical Notes

An FT-IR Spectrometer is an instrument which acquires broadband NIR to FIR spectra. Unlike a dispersive instrument, i.e. grating monochromator or spectrograph, FT-IR Spectrometers collect all wavelengths simultaneously. This feature is called the Mul...

Laser Damage Threshold

 

Technical Notes

For continuous wave (CW) lasers the damage threshold can be calculated from the peak power and beam diameter. For example, to calculate the power density of a 50 mW Nd:YAG laser at 1064 nm with a 0.8 mm beam diameter, first calculate the beam area in...

Simulation of Solar Irradiation

 

Technical Notes

Oriel® Solar Simulators provide the closest spectral match to solar spectra available from any artificial source. The match is not exact, but better than needed for many applications. For the closest match possible, choose a Oriel Sol3A Class AAA Sol...

The Effect of Dispersion on Ultrashort Pulses

 

Technical Notes

The description of the Gaussian pulse given by (1) is intuitive in the sense that it is fairly straightforward to conceptualize a pulse in the time domain. However, when dealing with pulses traveling through dispersive media, it can be problematic to...

Optical Material Properties

 

Technical Notes

There are many things to consider before one can decide which material to use for the lenses in any applications. The most important material properties to take into consideration regarding a lens are as follows.

Stage Components Considerations

 

Technical Notes

Choosing the right positioning technology for an application is a complex task. There are numerous choices of linear stages, rotation stages and actuators and each product has its own advantages and disadvantages. The specifications of a stage are ce...

Information on Spectral Irradiance Data

 

Technical Notes

The radiometric data shown at the end of this section was measured in our Standards Laboratory. The wavelength calibrations are based on our spectral calibration lamps. Irradiance data from 250 to 2500 nm is based on an NIST traceable calibrated quar...

Optical Detector Definitions of Characteristics

 

Technical Notes

This glossary covers important terms relating to our New Focus photodetectors and photoreceivers.
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