Optoplex tunable optical filter optical tunable filter. A tf is a device whose spectral transmission can be electronically controlled by applying voltage, acoustic signal, etc. Instruments utilizing tunable filter spectroscopy can be used to replace traditional total gas detectors as well. Fiber fabryperot tunable filters ffp interferometers filter controllers micron optics unique, patented fiber fabryperot ffp filters are characterized by their rugged, lowloss, supercavity performance featuring. Infrared spectroscopy is a powerful analysis method, because many substances can be distinguished reliably by their unique absorption spectra. Efficient low loss design delivers high finesse, resolution and power handling performance fast response. Adjustment of the center wavelength is accomplished by tilting the bandpass filter with a high precision micrometer.
Tfs can be utilized from uv ultraviolet through ir infrared spectral regions. Endtoend simulations of the visible tunable filter for. In this report, by introducing an electronically tunable acoustooptical filter as a wavelength selector, a novel approach to a broadband stimulated raman spectroscopy is demonstrated. Tunable lasers market size, share global industry report. Thisbook gives active researchers and engineers the practical information they need to choose an appropriate tunable laser for their particular applications. The company designs, develops, manufactures, and markets high performance fiberoptic products to communications networks, and provides customized solutions to instrument, defense, spectroscopy and sensing industries. With injection of a combination of radiofrequency signals into its transducer, the aotf acts as an electronically controllable, multiplexing spectrometer. Inouye solar telescope that is currently under construction on maui hawaii.
Evaluating a tunable filter spectrometer online gas analyzer. Pdf a method to extend spectral range of tunable optical filter is proposed in this paper. Tunable diffractive filters for robust nir and ir spectroscopy. On the application of cw external cavity quantum cascade infrared lasers for plasma diagnostics d lopatik, n lang, u macherius et al. A solidstate acoustooptic tunable filter aotf is combined with krypton laser excitation 647 nm, holographic raman filters, and photoncounting silicon avalanche photodiode apd detection to. Imaging spectroscopy is particularly useful for non. The visible tunable filter vtf is a narrowband tunable filter system for imaging spectroscopy and spectropolarimetry based. Typical applications include medical and physiological diagnostics and research including blood sugar, pulse oximetry, functional neuroimaging, sports medicine, elite sports training, ergonomics, rehabilitation, neonatal research, brain. The acoustooptic tunable filter aotf is a digitally accessible, compact, solidstate spectrometer that is well suited to highfrequency optical switching and wavelength selection. Dicons manually tunable optical bandpass filter is used to manually adjust the center wavelength of a narrow optical bandpass filter over a 30nm wavelength range, centered at 1550nm. Spectral radiance source based on supercontinuum laser and wavelength tunable bandpass filter. Measured performance of a tunable bandpasstobandstop evanescentmode cavity filter.
Mems tunable filter specifications ordering information dicon fiberoptics, inc. The key to the simple and elegant design of the inline fabryperot tunable filter is the lensless all fiber construction. We describe such tunable filters based on the microflow of liquid crystals. The instrument will be one of the firstlight instruments of the daniel k. Semrock versachrome the first widely tunable thinfilm.
Acoustooptic tunable filters are powerful tools for spectroscopy, imaging, and wdm. The instrumentation provides the ability to rapidly collect largeformat images with the number of image pixels limited only by the number of detector elements in the silicon chargecoupled device ccd. Tunable filters that transmit a 2d imaging beam variety of tunable optical filter technologies, but all compromise at least some critical performance characteristics liquidcrystal tunable filter lctf acoustooptic tunable filter aotf linearvariable filter lvf. Osa nearinfrared acoustooptic tunable filter hadamard. Ultrafast lasers with tunable parameters in wavelength and time domains are the choice of light source for various applications such as spectroscopy and communication. Fourier transform infrared spectroscopy ftir, raman and tunable diode laser tdl. A new, simple and compact approach for tunable wavelength filtering is introduced with a device called flexible wavelength selector.
A new type of raman spectroscopy hyperspectral imager based on bragg tunable filter has been developed and demonstrated. The plate contains 256 layers periods with high and low indices of refraction. Pure electrical, highlyefficient and sidelobe free. Memsbased tunable optical filter arrays for nanospectrometer in. The compact and robust tunable filter can operate from 350 nm to 2. Tunable filter spectroscopy is a viable technology for the drilling environment that enables the measurement of compositional gas data at a much higher rate than is offered by a gas chromatograph. Optoplex corporation is a leading supplier of cuttingedge photonic components, modules and subsystems for dynamic wavelength management and signal conditioning.
Laser induced breakdown spectroscopy libs is an analytical technique based on the application of one or more high power short duration laser pulses on a restricted region of the sample to be analyzed, promoting its ablation andor excitation, with the formation of a transient plasma, whose emitted radiation is monitored by means of an appropriate detection system wavelength. Pdf major spinoffs from nasas multi and hyper spectral imaging remote sensing technology developed for earth resources monitoring, are. Wavelength selection is achieved with an acoustooptic tunable filter aotf, which. Gupta traces the development of these devices and discusses current and future applications. Spectrum of a bandpass fluorescence filter for unpolarized light as it is. To construct the digitally tunable bandpass filter, i used digitally tunable capacitors dtc. Among the many different types of frequency tunable lasers are. The tunable lasers market is apprehended to witness significant growth in the next few years owing to aforementioned benefits. A liquid crystal tunable filter lctf is an optical filter that uses electronically controlled liquid crystal lc elements to transmit a selectable wavelength of light and exclude others. There are no collimating optics or lenses, thus the inline fabryperot tunable filter has eliminated the pitfalls of other fabrypero t component technologies, including misalignment, environmental sensitivity, and. In this communication, we describe a technique for obtaining highfidelity raman images and raman spectra.
The response of the second filter is shown below in fig. The instrumentation development of a nearinfrared nearir spectrophotometer based on an acoustooptic tunable filter aotf and its application as a detector for flow injection analysis fia are reported. Optic tunable filter spectroscopy scheme operation of an acousto. Lltf contrast vis2 laser line tunable filter from photon etc is a novel optical filtering technology that is suitable for tunable excitation sources in fluorescence and raman spectroscopy. Temperature control is important since the birefringence of the.
The imager is continuously tunable over 400 nm with a spectral resolution of 0. Nearinfrared emission spectrometry based on an acousto. Often, the basic working principle is based on the lyot filter but many other designs can be used. Infratecs tunable filter technology is based on a micromachined fabryperot interferometer fpi, which is comprised of two flat and parallel reflector plates fig. Tunable optical filter principles meadowlark optics. Tuneable filter spectrometer tfs technology is an emerging spectroscopy technology that offers the following benefits against the online gas chromatograph.
Most kurios models have a fixed bandwidth for any given center wavelength. Highly efficient tunable filter for broadband light source. Current design of a imaging tunable filter using a single vbg. Thinfilm filters tunable over a wide range of wavelengths by adjusting the. The main difference with the original lyot filter is that the fixed wave plates are replaced by switchable.
An ideal tunable filter would possess the attributes listed in table 1. Mks ftir or tunable filter spectroscopy tfs selection guide. Perhaps the greatest advantage of the liquidcrystal tunable filter is the exceptionally wide tuning range these filters can be designed to tune over many 100s of nm. These components have a variable capacitance that can be controlled digitally. Lltf laser line tunable filter volume bragg gratings. A new detection system for laser induced breakdown. Using tunable filter spectroscopy for compostional gas. Nearinfrared acoustooptic tunable filter hadamard transform. Dts0152 electrically controlled fabryperot tunable filters. A tunable optical filter works on the principle of polarization.
Mks instruments platform of innovative optical analyzers based on tunable filter spectroscopy tfs provides realtime gas analysis, while delivering customers a substantially lower total cost of ownership. This new device combines the flexibility of a monochromator with the imaging functionality of a thinfilm interference filter, and is ideal for use in both illumination and image acquisition in optical microscopes. Flexibility and performance of a device equipped with a tunable filter are more sophisticated than. The multiplexing aotf in this study is employed in two. In particular, filters are available for tuning over the entire visible wavelength range 700 nm. The figure 6 shows a picture of the imaging bragg tunable filter ibtf. When receiving a stream of optical signals of a plurality of wavelengths from the inputport in, the 2port tunable optical filter directs a selected channel to the outputport out. Pdf threestage fabryperot liquid crystal tunable filter with.
Electronically tunable filter etf is another kind of filters that transmit desired spectral bands by controlling voltage, or acoustic signal, etc. In simple terms, it acts as a half wave resonator, producing a series of transmittance peaks of successive interference orders fig. Mks tfs sensor platforms have been on the market since 2008 with more than 2500 systems deployed. We present a compact tunable optical filter for spectroscopy applications. Realtime gas composition response time with fast updated results. Wavelength and pulse duration tunable ultrafast fiber. Meadowlark optics tunable optical filters facilitate spectral. Spie 6269, groundbased and airborne instrumentation for astronomy, 62695h 28 june 2006.
Through cascading a lowpass tunable edge filter with a longpass tunable edge filter, one can achieve a new type of bandwidthtunable filter whose passband width is variable while its center wavelength is still tunable. Tunable optical filter and ir gas spectroscopy springerlink. The digitally tunable bandpass filter in this article covers a frequency range of 2 mhz to 148 mhz, and can handle up to 26 dbm of rf power. Easily hold a versachrome filter and mount it to a manual or motorized. Wavelength and pulse duration tunable ultrafast fiber laser. A new detection system for laser induced breakdown spectroscopy based on an acoustooptical tunable filter coupled to a photomultiplier. Optoplexs tunable optical filter, also known as optical tunable filter or tunable bandpass filter, is an integrated module, consisting of micro optics and electronics. Raman spectroscopy hyperspectral imager based on bragg. It is manually controlled and versions are available covering all the key telecom wavelengths from 1260 nm to1650 nm and bandwidths from 32 pm 4 ghz to 5 nm. Optofluidictunable color filters and spectroscopy based.
The integration of color filters with microfluidics has attracted substantial attention in recent years, for onchip absorption, fluorescence, or raman analysis. It illustrates the possibility of using the undiffracted light where the tunable filter acts as a notch filter to create a second focal plane. Recent citations simultaneous multigas detection between 3 and 4m based on a 2. The filter operation is based on the wavelengthdependent liquid cryst. Gaussianshape tunable optical filter over 780nm up to 120nm wavelength tuning range down to 0. Abstract an entirely new type of imaging tunable filter has been developed by photon etc.
With the xtm50 both center wavelength and bandwidth can be independently adjusted. Tunable optical filters standard tunable optical filters typical filter curves for the tofvis a tunable optical filter consists of multiple liquid crystal variable retarders filter stages protected in a temperaturecontrolled housing. Apr 05, 2000 imaging spectroscopy is particularly useful for non homogeneous samples or scenes. Controls i adapted an arduino uno circuit board figure 6 here is the schematic diagram of the digitally tunable bandpass filter.
Optoplexs tunable optical filter, also known as optical tunable filter or tunable bandpass filter, is an integrated module, consisting of micro optics and electronics when receiving a stream of optical signals of a plurality of wavelengths from the inputport in, the 2port tunable optical filter directs a selected channel to the outputport ou. Nearinfrared spectroscopy nirs is a spectroscopic method that uses the nearinfrared region of the electromagnetic spectrum from 780 nm to 2500 nm. Instruments utilizing tunable filter spectroscopy can be used to. Nearinfrared detection of flow injection analysis by.
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