PRODUCTS > THz filter > THz low-pass filter > THz Low Pass Filter

Classification

THz Spectroscopy

THz-TDS

THz Crystal

Photoconductive Antenna

THz Near-Field Probe

THz Measurement Module

Bias Generator
THz detection

THz detector

Terahertz frequency measurement system
THz Polarization Optics

THz polarizer

THz waveplate

Polarizer/waveplate rotation mount

THz isolator
THz filter

THz low-pass filter

THz bandpass filter

THz high-pass filter
THz optics

THz lens

THz Mirror

THz attenuator

IR-THz window

THz beam splitter

THz spectroscopy beam splitter

THz collimator

THz grating

THz resolution target

THz anti-reflection coating

THz fiber

THz materials
Optical Crystals

THz Low Pass Filter

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THz Low Pass Filter

Product Introduction

THz Low Pass Filter is a component designed to transmit and block short-wavelength THz waves. These filters are fabricated by encapsulating specific materials. Their fundamental operating principle relies on the theories of dispersion, reflection, scattering, diffraction, and interference.

THz Low Pass Filter Applications

- THz Optical Spectroscopy;

- Imaging;

- THz Testing Facility;

- The Fields of Astronomy, Space Science, and Aerospace Engineering;

- Material Research;

- Sensors and Detectors;

- The Field of Optoelectronic Research.

THz Low Pass Filter Characteristics

- The operating wavelength range spans from IR to mm waves;

- High transmittance within the light-transmitting range;

- The transmittance is low (<1%) outside the light-transmitting range;

- With packaging.

Section 1.THz Low Pass Filter

Model specifications for partial THz Low Pass Filter:

Model	External Diameter(mm)	Clear Aperture(mm)	Cut-Off Wavelength(um)/Frequency(THz)	Maximum Transmittance(%)	Injury Threshold(W/cm²)
LPF23.4-24	31	24	13 um / 23.4 THz	92	7
LPF23.4-35	44	35		92	7
LPF23.4-47	60	47		92	7
LPF23.3-24	31	24	13 um / 23.3 THz	94	7
LPF23.3-35	44	35		94	7
LPF23.3-47	60	47		94	7
LPF23.1-24	31	24	13 um / 23.1 THz	91	7
LPF23.1-35	44	35		91	7
LPF23.1-47	60	47		91	7
LPF14.3-24	31	24	21 um / 14.3 THz	95	7
LPF14.3-35	44	35		95	7
LPF14.3-47	60	47		95	7
LPF10.9-24	31	24	27.5 um / 10.9 THz	73	8
LPF10.9-35	44	35		73	8
LPF10.9-47	60	47		73	8
LPF8.8-24	31	24	34 um / 8.8 THz	80	8
LPF8.8-35	44	35		80	8
LPF8.8-47	60	47		80	8
LPF5.5-24	31	24	55 um / 5.5 THz	83	8
LPF5.5-35	44	35		83	8
LPF5.5-47	60	47		83	8
LPF4.3-24	31	24	70 um / 4.3 THz	82	8
LPF4.3-35	44	35		82	8
LPF4.3-47	60	47		82	8
LPF4.0-24	31	24	75 um / 4.0 THz	82	8
LPF4.0-35	44	35		82	8
LPF4.0-47	60	47		82	8
LPF3.2-24	31	24	94 um / 3.2 THz	81	8
LPF3.2-35	44	35		81	8
LPF3.2-47	60	47		81	8

In addition to standard products, other specifications can be customized as required.

Summary of transmittance curves for THz Low Pass Filter:(For more information, please download“Low Pass Filter Product Information”)

Partial THz Low Pass Filter sample cases,transmission curve（for more information,please download“Low Pass Filter Product Information”）

THz Low Pass Filter LPF23.4 transmittance curve：

THz Low Pass Filter LPF14.3 transmittance curve：

THz Low Pass Filter LPF8.8 transmittance curve：

THz Low Pass Filter LPF5.5 transmittance curve：

The transmittance curve of Low Pass Filter at wavelengths ranging from 0.2 to 20 μm

*Please note that many customers use these Low Pass Filters in time-domain spectroscopy to block near-infrared lasers while allowing terahertz radiation to pass through. These filters are fabricated with a sandwich structure, one component of which is low-density polyethylene (LDPE) with a high carbon content. This material resembles black plastic in appearance; therefore, if the power beam used in your experiment can burn through the "black polyethylene," it may also damage these filters. It is therefore recommended that the laser beam incident from the white polyethylene side, and when the intensity is particularly high, an additional layer of polyethylene window film should be placed in front of the filter.

Section 2.Ceramic Plate THz Low Pass Filter
The second type of THz Low Pass Filter consists of a series of units composed of individual plates made from various ceramic materials. These filters can be used with or without a support structure. The cutoff frequency of these plates is defined at a transmission level of 1%. The name of the filter includes the corresponding terahertz frequency.

The maximum dimensions of a THz Low Pass Filter can be customized as required. Certain filters are capable of withstanding extreme temperatures; for example, the LPFK20.9 filter operates at extremely low temperatures, making it suitable for use with nitrogen and helium refrigerants as well as in space applications.

Name and parameters of the Ceramic THz Low Pass Filter:

Model	External Diameter(mm)	Clear Aperture(mm)	Cut-Off Wavelength(um)/Frequency(THz)	Maximum Transmittance(%)
LPFK20.9-24	31	24	14 um / 20.9 THz	80
LPFK20.9-35	44	35		80
LPFK20.9-47	60	47		80
LPFK3.9-24	31	24	76 um / 3.9 THz	75
LPFK3.9-35	44	35		75
LPFK3.9-47	60	47		75
LPFK3.0-24	31	24	98 um / 3.0 THz	70
LPFK3.0-35	44	35		70
LPFK3.0-47	60	47		70
LPFK2.1-24	31	24	138 um / 2.1 THz	89
LPFK2.1-35	44	35		89
LPFK2.1-47	60	47		89
LPFK1.3-24	31	24	237 um / 1.3 THz	72
LPFK1.3-35	44	35		72
LPFK1.3-47	60	47		72
LPFK1.2-24	31	24	256 um / 1.2 THz	43
LPFK1.2-35	44	35		43
LPFK1.2-47	60	47		43
LPFK1.0-24	31	24	305 um / 1.0 THz	31
LPFK1.0-35	44	35		31
LPFK1.0-47	60	47		31
LPFK0.9-24	31	24	342 um / 0.9 THz	≥ 55
LPFK0.9-35	44	35		≥ 55
LPFK0.9-47	60	47		≥ 55
LPFK0.8-24	31	24	373 um / 0.8 THz	41
LPFK0.8-35	44	35		41
LPFK0.8-47	60	47		41
LPFK0.7-24	31	24	397 um / 0.7 THz	82
LPFK0.7-35	44	35		82
LPFK0.7-47	60	47		82
LPFK0.5-24	31	24	601 um / 0.5 THz	≥16
LPFK0.5-35	44	35		≥16
LPFK0.5-47	60	47		≥16
LPFK0.4-24	31	24	744 um / 0.4 THz	≥93
LPFK0.4-35	44	35		≥93
LPFK0.4-47	60	47		≥93
LPFK0.3-24	31	24	833 um / 0.3 THz	≥10
LPFK0.3-35	44	35		≥10
LPFK0.3-47	60	47		≥10
LPFK0.2-24	31	24	1376 um / 0.2 THz	≥60
LPFK0.2-35	44	35		≥60
LPFK0.2-47	60	47		≥60