SuperK LLTF Contrast

LLTF Contrast – tunable high-contrast filter

The LLTF Contrast is a tunable, high-resolution bandpass filter that converts our supercontinuum sources into widely tunable picosecond lasers. You get a wideband tuning range across the visible and near-infrared.

The filter transmits a single laser line and blocks unwanted lines with excellent out-of-band suppression. The LLTF also provides a simple and intuitive user interface.

Key Features

Single-channel tunable band-pass filter

­Exceptional out-of-band suppression

Wideband tuning across VIS and nIR

Narrow line-width and high resolution

Simple and intuitive user interface

Robust and maintenance-free

Models and options

VIS HP8
VIS HP8
Wavelengths 400-1000 nm
Spectral bandwidth < 2.5 nm
SWIR HP8
SWIR HP8
Wavelengths 1000-2300 nm
Spectral bandwidth < 5 nm

Want to know more?

Get in touch with one of our supercontinuum experts

Your continuously tunable high-resolution bandpass filter

The LLTF Contrast is a continuously tunable high-resolution bandpass filter that effectively converts our supercontinuum sources into widely tunable picoseconds lasers.

Covers the spectrum from visible to infrared

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.

Adapts directly to the output collimator

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

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

User-friendly interface

The LLTF can be operated through a user-friendly PHySpec software or a direct interface through the free software development kit.

Specifications

Choose model:
VIS
SWIR
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 @ ±80 nm1)
Typical transmission efficiency
65 %
65 %
Optical density
OD6 @ 1064 nm
OD6 @ 1064 nm
Damage threshold
@ 1064 nm, 8 ns
< 5 GW/cm2 peak power
< 5 GW/cm2 peak power
Input aperture diameter
5 mm
5 mm
Input beam divergence requirement
< 0.45 mrad
< 0.45 mrad
Wavelength resolution, relative
FWHM / 8
FWHM / 8
Pointing stability @ 1 m from filter
< 1 mm lateral displacement
< 1 mm lateral displacement
Scanning speed stabilization time…
… for 0.1 nm step
35 ms
35 ms
… for 0.2 nm step
45 ms
45 ms
… for 1 nm step
55 ms
55 ms
… for 2 nm step
60 ms
60 ms
… for 5 nm step
65 ms
65 ms
… for 10 nm step
70 ms
70 ms

1) Harmonic wavelengths <850 nm will be present in the output. We recommend an external clean-up long-pass filter if the detector is sensitive to visible wavelengths.

VIS
SWIR
Dimensions (WxHxL)
177.5 x 174 x 277.5 mm
177.5 x 174 x 277.5 mm
VIS
SWIR
Interface
Graphical User Interface via USB 2.0
Graphical User Interface via USB 2.0
Software Development Kit
Optional
Optional
Interlock
Integrated
Integrated