LLTF tunable high contrast single line 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 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 Supercontinuum sources 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 a free-space collimated beam and can optionally be coupled to single-mode polarisation maintaining fibers.

  • 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
  • Very stable output pointing stability
  • High transmitted beam quality
  • Plug-and-play operation

The full spectrum from any NKT Photonics Supercontinuum system can be covered thanks to two options:

Tunable Wavelength Range Channel Spectral Bandwidth
LLTF Contrast VIS 400-1000 nm <2.5 nm
LLTF Contrast SWIR 1000-2300 nm <5 nm
Number of Wavelength Channels 1
Out-of-Band Suppression (> 40 nm from CWL) >60dB
Transmission Efficiency 60% peak transmission
Wavelength Calibration Internally calibrated
Wavelength Tuning Resolution 0.1nm
Tuning Speed (between any two wavelengths) <600ms
Wavelength Scan Up to 1000nm/s
Beam Quality Single spatial mode at all wavelengths
Input Type Plug & Play to any
NKT Photonics supercontinuum
Output Type Free-space collimated
or multi-mode fiber delivery
or single-mode fiber delivery
Output Polarisation Unpolarised
Interface Graphical User Interface via USB
(optional SDK)
Interlock Integrated
Dimensions (W x L x H mm) 230 x 160 x 173