LLTF Tunable High Contrast Filter

The LLTF Contrast is a continuously tunable high-resolution bandpass filter that effectively converts a NKT Photonics’s supercontinuum source into a widely tunable picosecond laser. The filter transmits, with high efficiency, a single laser line while blocking unwanted lines with excellent out-of-band suppression.

The LLTF Contrast is a continuously tunable high-resolution bandpass filter that effectively converts a NKT Photonics’ supercontinuum source into a widely tunable picoseconds laser. The filter transmits, with high efficiency, a single laser line while blocking unwanted lines with excellent out-of-band suppression.

The LLTF Contrast is a non-dispersive filter maintaining the intrinsic single-mode beam quality of the supercontinuum laser enabling a wide range of applications. With two wavelength tuning options, Visible and NIR, the full spectrum of the supercontinuum can be covered.

The LLTF Contrast is compatible with all NKT Photonics Supercontinuum lasers and is fully plug-and-play – adapting directly to the supercontinuum output collimator.

Control is via USB 2.0 and intuitive Graphical User Interface

The output of the LLTF Contrast is compatible with SuperK CONNECT and SuperK Fiber deliveries (recommend FD7 for VIS and FD8 for SWIR) .

  • ­ Single channel tunable band-pass filter
  • ­ Exceptional out-of-band suppression
  • ­ Narrow line-width and high resolution
  • ­ Ultra-wideband tuning range across the UV-Visible-NIR range
  • ­ High degree of pointing stability
  • ­ Plug-and-play operation

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Wavelength range Spectral Bandwidth Max. Power
LLTF Contrast VIS HP8 400-1000 nm 1.0-2.5 nm 8 W
LLTF Contrast SWIR HP8 1000-2300 nm 2.0-5.0 nm 8 W
LLTF Contrast VIS HP20 400-1000 nm 2.0-5.0 nm 20 W
LLTF Contrast SWIR HP20 1000-2300 nm 2.0-5.0 nm 20 W

Optical

Tunable Wavelength Range 400 - 1000 nm 1000 – 2300 nm
Channel Spectral Bandwidth (FWHM) 1.0 - 2.5 nm 2.0 - 5.0 nm
Out of Band suppression 60 dB @ ±40 nm 60 dB @ ±80 nm
Typical Transmission Efficiency 65%
Optical Density (OD) > OD6 (measured at 1064 nm)
Damage Threshold < 5 GW/cm2 peak power @ 1064 nm, 8 ns
Input Aperture Diameter 5 mm
Input Beam Divergence Requirement < 0.45 mrad
Wavelength Resolution (Relative) FWHM / 8
Pointing Stability < 1 mm lateral displacement @ 1 m from filter
Scanning speed (multiple step)  35 ms stabilization time for 0.1 nm step45 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

Interface Graphical User Interface via USB 2.0
(optional SDK)
Interlock Integrated
Dimensions (W x L x H mm) 172 x 278 x 174