Polarizationdefinition in Chemistry

Wavelength: 2800 nmBandwidth: 2750-2870 nm  (Small absorption bands of  ~10% may exist in the 2835 nm region)   Aperture: 4.5 mmPower: 5 WIsolation: 28-35 dBTransmission: 80%Crystal Polarizers

Wavelength: 2000 nm, Bandwidth: 1940-2060 nmAperture: 4.5 mmPower: 20 WIsolation: 34-40 dBTransmission: 88-90%Crystal Polarizers

Specac provide a range of infrared wire grid polarizers for use in analytical testing across the mid-and-far-infrared spectrum of light. Some of these are compatible with our spectrometer accessories, allowing the user to mount a polarizing filter directly into an accessory or sample cell, further refining their analysis.

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Wavelength: 2500 nm, Bandwidth: 2400-2600nmAperture: 4.5 mmPower: 5 WIsolation: 28-35 dBTransmission: ~83%Crystal Polarizers

The orientation of the electric field plane is known as the “polarization direction” (E). This can be broken down into three basic categories:

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What we generally refer to as “light” is more correctly known as ‘electromagnetic radiation’ (often abbreviated as EM radiation). The the main characteristics of electromagnetic radiation are its frequency and wavelength (λ). We broadly classify frequency into types of EM radiation, such as radio waves, microwaves, terahertz, infrared, visible light, ultraviolet, X-rays and gamma rays. In this sequence, radio waves are radiation with the lowest frequency (and largest wavelength) and gamma rays have the highest frequency (and shortest wavelength).

Light that has been polarized is useful because it enables the user to be selective over what part of the electromagnetic spectrum is used (whether for photography, night-vision, coloured lighting or analytical measurement). Of course, this filtering of light can offer the user a finer level of detail for their application, similarly to a sharp knife or a small paint brush.

For waves with their electric fields perpendicular to the wires, the electrons cannot move far across the wires (remember, the diameter of the wires are much smaller than the wavelength of light). So the perpendicular light passes through un-blocked (save for very small amounts).

Controlling reflections is an important application of polarizers. If the specific interactions with the surface are of interest, then the polarizer can be oriented parallel to select only the reflected rays; if the reflections are an unwanted source of measurement noise, the polarizer can be oriented to reduce them.

Wavelength: 1940 nm, Bandwidth: 1850-2000 nmAperture: 4.5 mmPower: 10 WIsolation: 35-40 dBTransmission: 86-90%Crystal Polarizers

Wavelength: 3000 nm, Bandwidth: 2950-3100 nmAperture: 4.5 mmPower: 5 WIsolation: 28-35 dBTransmission: 80%Crystal Polarizers

Wavelength: 2050 nm, Bandwidth: 2000-2100 nmAperture: 4.5 mmPower: 20 WIsolation: 34-40 dBTransmission: 88-90%Crystal Polarizers

The 1.55-3.4 µm range requires several types of Faraday rotator materials and polarizers for maximum isolation and transmission.

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Wavelength: 2700 nm, Bandwidth: 2600-2800nmAperture: 4.5 mmPower: 200 mWIsolation: 35-40 dBTransmission: 85-88%Absorptive Polarizers

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In addition to our listed wavelengths, there are many isolator design customization options to maximize performance for your specific laser wavelength. Please contact us. Our designs will be configured for your laser wavelength.

Wire Grid Polarizers are included in the Specac polarizer product range. It consists of an array of fine parallel conductive wires placed perpendicular to the incident beam, with the spacing of the wires being smaller than the wavelength of the light being filtered.

EM radiation has an electric and magnetic field component which oscillates in phase perpendicular to each other and to the direction in which the radiation propagates. These two oscillating fields are often visualised as in the diagram above and are continually self-propagating.

Wavelength: 2940 nm, Bandwidth: 2900-3000nmAperture: 4.5 mmPower: >5 WIsolation: 28-35 dBTransmission: 80%Crystal Polarizers

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In many spectroscopic and photonics applications, it is desirable to work with light that has been polarized in a particular direction. In this article we explore what polarization is, and how it may be obtained from an unpolarized light source.

Wavelength: 2700 nm, Bandwidth: 2600-2800nmAperture: 4.5 mmPower: 5 WIsolation: 30-35 dBTransmission: 80%Crystal Polarizers

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Wavelength: 2900 nm                              Bandwidth: 2850-3000 nm (Small absorption bands of  ~10% may exist in the 2835 nm region)Aperture: 4.5 mmPower: 5 WIsolation: 28-35 dBTransmission: 80%Crystal Polarizers

Wavelength: 2090 nm, Bandwidth: 2030-2130 nmAperture: 4.5 mmPower: 20 WIsolation: 34-40 dBTransmission: 88-90%Crystal Polarizers

Wavelength: 2350 nm, Bandwidth: 2250-2450 nmAperture: 4.5 mmPower: 200 mWIsolation: 30-37 dBTransmission: 86-90%Absorptive Polarizers

Wavelength: 2350 nm, Bandwidth: 2250-2450 nmAperture: 4.5 mmPower: 5 WIsolation: 28-35 dBTransmission: ~85%Crystal Polarizers

To learn more about what spectroscopy can do, check out #SpectroscopySolutions for more insights into the applications XRF and FTIR can fit.

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Some light waves will be parallel to these wires and those electrons will move along the wires instead of passing through to the other side of the filter. Any electrons that are not angled at the same plane as the wires (perpendicular) do not collide and are therefore free to move to the other side.

Wavelength: 3200 nm, Bandwidth: 3100-3250 nmAperture: 4.5 mmPower: 5 WIsolation: 28-35 dBTransmission: 82%Crystal Polarizers

Many interactions of light with matter depend on its polarization. For example, at a reflective interface, components of light whose polarizations are oriented perpendicular to the plane of incidence are reflected more strongly than those oriented parallel to it. At one angle of incidence in particular – Brewster’s Angle – the reflected ray is completely polarized perpendicular to the plane of incidence.

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Wavelength: 1645 nm, Bandwidth 1530-1680 nm         Aperture: 4.5 mm         Power: 15 W         Isolation: 35-40 dB         Transmission: 88-90%         Calcite Polarizers