The NP-TNF series is a polarizer-free tunable notch filter made from Kent Optronics' proprietary liquid crystal materials. The NP-TNF provides the most agile means for light spectral notch. The notch wavelength of a single NP-TNF, with a bandwidth of a few tens to hundreds of nanometers, can be electrically tuned across a broad spectral region from 300 to1000 nm in the visible and infrared for light blocking or routing.

The product series provides customers with an excellent E-O component for serving as a tunable laser beam director, laser blocker, beam splitter, etc… in the envisioned photonics systems, such as laser protection devices, remote sensing, spectral imaging, vision-aid devices, and broadband light routing.

As compared to the state-of-the-art tunable notch filters, the NP-TNF series offers the following unprecedented performance specifications:

• Much broader tuning range over 300 to 1,000nm,
• high optical density (OD) at the notch wavelength
• >80% out band transmittance, and
• <0.5 ms/nm tuning speed

The product comes with a compact power supply that can be either battery or 110/220 V wall-plug powered. Customers have the options to choose the filter substrate material, shape, aperture, pixel format and the operation mode (i.e., manual or computer controlled). All products are offered at a competitive price. Contact us for a price quote with your specific application requirements.

NP-TNF™ Specifications

Spectral region	0.4-2.7 µm
Out notch band transmittance	~80%
Polarization properties	Polarization insensitive
Tuning range	30-1,000 nm (continuously tunable blocking)
Repeatability and precision	<±1 nm
Tunable narrowband blocking optical density	OD>3 over the bandwidth
Angular range for broadband transmission (parallel light operation)	>25° in air
Angular range for tunable narrowband blocking (parallel light operation)	>25° in air
Spectral bandwidth	50-300 nm
Spectral uniformity	<2 nm
Clear aperture	Diameter: 5-50 mm (circular) Area: 5x5 to 50x50 mm² (square)
Thickness	<10 mm
Operating temperature range	-5°C (23°F) to 55°C (131°F) without heating mechanism; -40°C (-40°F) to 55°C (131°F) with heating mechanism
Survival temperature range	-51°C (123.8°F) to 120°C (248°F)
UV stability	Stable under UV-B at 40mW/cm² for 3000 hours
Laser damage threshold	>1 J/cm² (5ns pulsed @ 532nm) >1 kW/cm² (CW @ 532nm)
Uniformity of retardance	<0.1 OD across the clear aperture
Wavefront distortion	<0.5 wavelength at 633 nm
Parallelism	<2 arcminutes
Tuning speed	<0.7 ms/nm
Rate of change of temperature	Survives a rate of change of temperature of 3°C per minute
Driving voltage	Up to 350V
Computer interface	USB interface w/ PC
Weight	<100g (filter only)
Substrate material	Glass, quartz, and plastic (PC)
Cable length	1 m
Input power to the driver	110V or 220V/50-60Hz AC or 9V battery
Filter power consumption	<6mW/cm²
Power supply weight	200g