Kent Optronics
Variable Bandwidth Tunable Filter

The VBTuF stands out from other state-of-the-art tunable band-pass filters because of its large range of central wavelenghts and its independently variable bandwidths.

Data Sheet

Variable Bandwidth Tunable Filter

The Variable Bandwidth Tunable Filter (VBTuF), based on Kent Optronics's privately owned liquid crystal design, is the most agileway to select light spectrums with user-controlled bandwidths. The center wavelength of a single filter can be electrically tuned across a spectral region of 300 to 1,000 nm in the visible and infrared. Additionally, the user can choose a bandwidth of anywhere from a few to hundreds of nanometers.

This product series provides customers with an E-O component that serves as a tunable light illuminator or a spectrum discriminator/selector.

As compared to state-of-the-art tunable bandpass filters, the VBTuF offers the following unprecedented performance specifications:

  • A much broader tuning range: 300-1,000 nm
  • Variable spectrum bandwidth: 5-100's nm
  • ~30% in-band transmittance
  • <1% out-band light leakage
  • <0.5 ms/nm tuning speed

This product comes with a compact power supply. Customers have the option to choose:

  • Filter aperture
  • Spectrum tuning range
  • Spectrum bandwidth
  • Operating interface

Potential Applications:

  • Spectrum analytical instruments
  • Remote sensing
  • Spectral imaging
  • Vision-aid devices

filter narrow

filter medium

filter broad

Narrow bandwidth

Medium bandwidth

Broad bandwidth

VBTuF Specifications

Spectral tuning region 0.4-2.7 µm
Wavefront distortion <0.5: wvelength at 633 nm
Spectral bandwidth 5-100 nm
Parallelism <2 arcminutes
In-band transmittance ~40%
Out-band transmittance <1%
Tuning speed <1 ms/nm
Rate of change of temperature Survives a rate of change of temperature of 3°C per minute
Polarizing properties Linear polarization
Computer interface USB interface w/PC
Repeatability and precision <±1 nm
Substrate material Glass, quartz
Angular acceptance ~25° in air
Input power to the driver 110V or 220V/50-60 Hz AC
Spectral uniformity <0.1 nm
Filter power consumption <1mW/cm²
Clear aperture Diameter: 5-50 mm (circular)
Area: 5x5 to 50x50 mm² (square)
Weight <100g (filter only)
Operating temperature range -5°C (23°F) to 70°C (158°C) without heating mechanism
-40°C (-40°F) to 70°C (158°F) with heating mechanism
Survival temperature range -51°C (-59.8°F) to 120°C (248°F)
UV stability Stable under UV-A&B