“Fingerprint” vs Handheld Raman applications
Raman spectroscopy is a powerful and increasingly ubiquitous analytical tool capable of identifying molecular constituents of samples under test and, when combined with microscopy, exploring specific cellular structures and functions. Non-invasive, non-contact, requiring no sample preparation or chemical tagging – it is no wonder that Raman has established a presence as an invaluable analytical technique both in labs and in the field.
Edge Filters for Raman Spectroscopy
Raman spectroscopy probes the molecular vibrational and rotational modes of a material in order to detect and identify the material. Typically, laser light is incident upon the material and the scattered light is measured.
The excitation source (laser line) intensity is often to orders of magnitude greater than the Raman scattered signal. Therefore, edge pass (or notch) filters are required to block the Rayleigh scattered laser light while transmitting the red-wavelength shifted (Stokes) and/or the blue-wavelength shifted (Anti-Stokes) Raman scattered signal.
Optical Interconnects for Data Centers- Lighting the Cloud
Introduction As data storage and computing resources move into the cloud the demand on data centers for storage and data transfer capacity has increased dramatically over the last decade (ref. 1). Stored data needs to be accessed and transferred constantly to and from these datacenters as well as within the data center and this has […]
Dual Band Filter Application Note
Dual band pass filter (DBPF) applications are at the leading edge of fiber optical modules and systems. Using DBPFs is a new concept in multiplex and de-multiplex module design used in optimizing wavelength ranges or channel management. The application of DBPFs makes it possible to reduce the component quantity in optical modules, enhances their performance, […]
Gain Flattening Filter (GFF) Tutorial
Gain Flattening Filter (GFFs), also known as gain equalizing filters, are used to flatten or smooth out unequal signal intensities over…
Tap Coupler – Beamsplitter Tutorial
Tap couplers filters and beamsplitters are used to reflect a specific percentage of incident light over a broad wavelength range and for a specified angle of incidence. Beamsplitters and tap couplers can be specified…
CWDM Filter Tutorial
Coarse Wavelength Division Multiplexing (CWDM) filters are designed to multiplex and de-multiplex wavelength signals in metropolitan, access and enterprise networks and for Cable TV applications. In addition…
Linear Transmittance Filter Tutorial
Linear Transmittance Filter (LTF) has a transmittance that is changing linearly over a specified wavelength range. LTFs are typically used for…
Single Cavity Filter Tutorial
The Single Cavity Filter (SCF) is used to select a single frequency from a broad spectral range. SCFs are typically used for…
Etalon Tutorial
A Solid Etalon Filter (SEF) is used to select a periodically spaced frequency grid from a broad spectral range. The key specifications
Band Pass Filter Tutorial
Band Pass Filters (BPFs) are used to pass (transmit) a range of wavelengths and to block (reflect) other wavelength on either side of the bandpass. The region of high transmittance is known…
