Laser Line Tunable Filter
The Laser Line Tunable Filter (LLTF CONTRAST) is a non-dispersive tunable bandpass filter based on volume Bragg gratings. It combines very high optical density (> OD6), an outstanding out-of-band rejection, and wide tunability. The LLTF can be customized to cover the entire 400 nm to 2500 nm spectral range with a high spectral resolution.
It can be coupled with a wide variety of broadband sources to create a tunable laser source. It can also be used as a cleanup filter for spectroscopy applications.
There are numerous possible LLTF configurations whose spectral range and bandwidth can be finely tuned to fit specific needs. The specifications below of several tried-and-tested standard models may serve as a starting point.
Product Specifications
CONTRAST-SR-VIS | CONTRAST-SR-SWIR | CONTRAST-EXT IV | CONTRAST-X | |
---|---|---|---|---|
Spectral range | 400-1000 nm | 1000-2300 nm (2500 nm optional) | 400-2300 nm (2500 nm optional) | X represents a custom spectral range |
Bandwidth (FWHM) | 1.5 - 2.5 nm | 2.0 - 5.0 nm | 400-1000 nm, ≤ 2.5 nm 1000-2300 nm, ≤ 5.0 nm | 0.15 - 0.9 nm |
Out-of-band rejection | <-60dB@±40nm, <-30dB@±10nm | <-60dB@±80nm, <-30dB@±20nm | <-60dB@±40nm, <-30dB@±10nm <-60dB@±80nm, <-30dB@±20nm | Depends on the bandwidth |
Peak efficiency | Typically around 65% | Typically around 65% | Typically around 65% | Typically around 65% |
Optical density (OD) | > OD6 (measured at 1064 nm) | > OD6 (measured at 1064 nm) | > OD6 (measured at 1064 nm) | TBD |
Stabilization time / wavelength step | 20 ms < 1 nm; 25 ms / 1 nm; 28 ms / 2 nm; 35 ms / 5 nm; 50 ms / 10 nm | 20 ms < 1 nm; 25 ms / 1 nm; 28 ms / 2 nm; 35 ms / 5 nm; 50 ms / 10 nm | 20 ms < 1 nm; 25 ms / 1 nm; 28 ms / 2 nm; 35 ms / 5 nm; 50 ms / 10 nm | 20 ms < 1 nm; 25 ms / 1 nm; 28 ms / 2 nm; 35 ms / 5 nm; 50 ms / 10 nm |
Dimensions (L x W x H) | 9 x 6.3 x 6.7 (inches), 23 x 16 x 17 (cm) | 9 x 6.3 x 6.7 (inches), 23 x 16 x 17 (cm) | 11.8 x 9.1 x 6.7 (inches), 30 x 23 x 17.4 (cm) | 9 x 6.3 x 6.7 (inches), 23 x 16 x 17 (cm) |
CONTRAST-SR-VIS | CONTRAST-SR-SWIR | CONTRAST-EXT IV | CONTRAST-X | |
---|---|---|---|---|
Fibered output | An X-Y-Z translation adjustment allows coupling optimization | An X-Y-Z translation adjustment allows coupling optimization | An X-Y-Z translation adjustment allows coupling optimization | An X-Y-Z translation adjustment allows coupling optimization |
Harmonic filter | Blocks the harmonics coming from the region 400-500 nm | Blocks the harmonics coming from the regions 500-1000 nm and/or 1000-1150 nm | Blocks the harmonics coming from the regions 400-500 nm and/or 500-850 nm and/or 850-1150 nm | The filter is chosen according to the spectral range |
Alignement kit | In free space configuration (input/output), the alignment kit allows the user to rapidly find the correct alignment | In free space configuration (input/output), the alignment kit allows the user to rapidly find the correct alignment | In free space configuration (input/output), the alignment kit allows the user to rapidly find the correct alignment | In free space configuration (input/output), the alignment kit allows the user to rapidly find the correct alignment |
Spec Sheet
Publications
Journal of Biophotonics
- Nanosensors & Chemical Biology
Kinetic Analysis of Nanoparticle-Protein Interactions Using a Plasmon Waveguide Resonance
Solar Energy Materials & Solar Cells
- Photovoltaics
Contactless Characterization of Metastable Defects in Cu(In,Ga)Se2 Solar Cells Using Time-Resolved Photoluminescence
Annalen Der Physik
- Nanosensors & Chemical Biology
Electrochemical Structure-Switching Sensing Using Nanoplasmonic Devices
Optics Express
- Material Science
- Metrology
Ultra-Wide-Range Measurements of Thin-Film Filter Optical Density Over the Visible and Near-Infrared Spectrum
Optics Letters
- Material Science
- Metrology
Broadband Spectral Transmittance Measurements of Complex Thin-Film Filters With Optical Densities of Up to 12
Biomedical Optics Express
- Nanosensors & Chemical Biology
Self-Referenced Spectroscopy Using Plasmon Waveguide Resonance Biosensor
Thin Solid Films
- Photovoltaics
Micrometric Investigation of External Quantum Efficiency in Microcrystalline CuInGa(S, Se)2 Solar Cells
Journal of Biophotnics
- Nanosensors & Chemical Biology
Wide-Field Hyperspectral 3D Imaging of Functionalized Gold Nanoparticles Targeting Cancer Cells by Reflected Light Microscopy
Journal of Raman Spectroscopy
- Material Science
Evolution of the Raman Backscattered Intensity Used to Analyze the Micromechanisms of Deformation of Various Polypropylene Blends In Situ During a Uniaxial Tensile Test
Journal of Biophotonics
- Cancer Biology
Hyperspectral Darkfield Microscopy of PEGylated Gold Nanoparticles Targeting CD44-Expressing Cancer Cells
Experimental Eye Research
- Life Science
Regional Variation in Human Retinal Vessel Oxygen Saturation
SPIE: Advances in Photonics of Quantum Computing, Memory, and Communication
- Material Science
Spectral Properties of Ultra-Broadband Entangled Photons Generated From Chirped-MgSLT Crystal Towards Monocycle Entanglement Generation
SPIE: Physics, Simulation, and Photonic Engineering of Photovoltaic Devices II
- Photovoltaics
Evaluation of Micrometer Scale Lateral Fluctuations of Transport Properties in CIGS Solar Cells
Nano Letters
- Carbon-Based Materials
Measurements of the Population Lifetime of D Band and G′ Band Phonons in Single-Walled Carbon Nanotubes
Nano Letters
- Carbon-Based Materials
Single-Walled Carbon Nanotube Thermopile for Broadband Light Detection
Review of Scientific Instruments
- Life Science
- Material Science
- Metrology
High Performance Resonance Raman Spectroscopy Using Volume Bragg Gratings As Tunable Light Filters
Videos
Introduction to the Laser Line Tunable Filter - LLTF
The LLTF combines a wide spectral tunability (400-2300 nm) with the highest out-of-band rejection (< -60 dB) available on the market. When coupled to a supercontinuum source, the LLTF is an ideal tool for spectroscopy, calibration and hyperspectral imaging.
White Papers
Widely Tunable Filter: Technology & Measurement of Critical Specifications
Authors Daniel Gagnon and Laura-Isabelle Dion-Bertrand