+49 9233 715 7745 info@md-innovationtech.com

Supercontinuum Tunable Filter

Download Data Sheet

The Laser Line Tunable Filter (LLTF CONTRAST) is a non-dispersive patented (US patent 7557990) optical tunable bandpass filter based on volume Bragg gratings. It combines outstanding out-of-band rejection with an optical density higher than OD6 and a wideband tuning range across the visible (VIS) and infrared (NIR, SWIR) spectra. This supercontinuum filter can be customized to cover the entire 400 nm to 2500 nm spectral range with high resolution in wavelength.

Moreover, the LLTF exhibits remarkable versatility when integrated with supercontinuum sources, allowing for the generation of tunable excitation sources. No alignment or adjustment is required when connecting the optical tunable bandpass filter to a supercontinuum source. Such combinations unlock the potential for advanced spectroscopic techniques, including photoluminescence excitation (PLE), photoluminescence (PL), and Raman spectroscopy, enabling precise and insightful analyses.

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.

 

CHARACTERISTICS

  • Out-of-band rejection higher than OD 6
  • Wide tuning range
  • Efficiency up to 60%
  • Free-space or fiber coupled
  • Easy and rapid installation
  • Intuitive control software

Custom Products

Beyond our standard product lines, we bring to bear our know-how through collaborations with industry and researchers both local and international. It’s in our DNA to build systems that measure up to the high standards set by our customers in science and industry. Please contact us if you don’t see what you are looking for in our standard product lines.

CONTRAST VIS CONTRAST SWIR CONTRAST EXT-IV CONTRAST X
SPECTRAL RANGE
(extended and reduced spectral ranges also available**)		 400 – 1000 nm 1000 – 2300 nm
(2500 nm optional)		 400 – 2300 nm
(2500 nm optional)		 where X represents
a custom spectral range
BANDWIDTH (FWHM)***  1.0 nm – 2.5 nm 2.0 nm – 5 nm ≤ 2.5 (<1000 nm)
≤ 5.0 (>1000 nm)		 High resolution: 
0.15 nm – 0.9 nm
OUT OF BAND REJECTION**** < -60 dB @ ± 40 nm < -60 dB @ ± 80 nm
(measured up to 1.7 µm)		 < -60 dB @ ± 80 nm
(measured up to 1.7 µm)		 depends on the bandwidth
MAXIMUM INPUT AVERAGE POWER
HP4: UP TO 4W
HP8: UP TO 8W
HP20: UP TO 20W		 HP8, HP20 HP8, HP20 HP8, HP20 HP4
PEAK EFFICIENCY  typically around 65%
OPTICAL DENSITY (OD)  > OD6 (measured at 1064 nm) TBD
DAMAGE THRESHOLD  < 5 GW/cm2 peak power @ 1064 nm, 8 ns
INPUT APERTURE DIAMETER  5 mm
INPUT BEAM DIVERGENCE REQUIREMENT  < 1 mrad
WAVELENGTH RELATIVE ACCURACY  FWHM / 8
POINTING STABILITY  < 1mm lateral displacement @ 1 m from filter
SCANNING SPEED
(MULTIPLE STEP) 		 35 ms stabilization time for 0.1 nm step,

45 ms stabilization time for 0.2 nm step,

55 ms stabilization time for 1 nm step,

60 ms stabilization time for 2 nm step,

65 ms stabilization time for 5 nm step,

70 ms stabilization time for 10 nm step,
OPERATING SYSTEM (OS)  Windows Vista (32 & 64 bits)

Windows 7 (32 & 64 bits)

Windows 8 (32 & 64 bits)
SOFTWARE  PHySpec™ included (SDK available)
COMPUTER CONNECTION  USB 2.0 (compatible 1.1)
DIMENSIONS (L x W x H)  9” x 6.3” x 6.7”

(23 x 16 x 17) cm

 11.8” x 9.1” x 6.7”

(30 x 23 x 17.4) cm

 9” x 6.3” x 6.7”

(23 x 16 x 17) cm
OPERATING TEMPERATURE  10 to 40°C
STORAGE TEMPERATURE  0 to 50°C
POWER SUPPLY  100 – 240 V, 50 – 60 Hz
OPTIONS & ACCESSORIES
ENHANCED SWIR N/A * up to 2500 nm
FIBEROPTIC INPUT/OUTPUT 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 region
500-1000 nm and/or 1000-1150 nm		 Blocks the harmonics coming from the regions 400-500 and/or 500-850 and/or 850-1150 nm The filter is chosen according to the spectral range
ALIGNMENT KIT (FOR FREE SPACE) In free-space (input/output) configuration, the alignment kit allows the user to rapidly find the correct alignment
** EXTENDED AND REDUCED SPECTRAL RANGES ALSO AVAILABLE   e.g.: 500-2000 nm, 400-1700 nm, 500-900 nm, 500-650 nm, 650-1000 nm,  1000-1700 nm, 1700-2300 nm, etc.
NOTE: Photon etc. reserves the right to change the design and specification of the product at any time, without notice.

*** Valid if the divergence of the input beam does not exceed 1 mrad.

****  To reach this specification in free space configuration, it is required to couple the filter with Photon Etc.’s background suppressor accessory. Contact us for more details.

Applications

THIN FILMS OF GaP

Spectral dependence of the Faraday MO effect with temperature dependence measurements were performed on a semiconductor 2 µm epilayer (GaP) grown with embedded metallic ferromagnetic nanoclusters (MnP).

SWNT BREATHING MODES

Two narrowband tunable filters for resonance Raman spectroscopy (RRS) were designed to study the radial breathing modes of carbon nanotubes.

PUBLICATIONS