Band Pass Filter

Description:

l         Transmission rate at certain wave band is high and the waveband light at its both sides is stopped.

l         Cut-off filters of from near UV to medium infrared are available.

l         Broadband filter and narrowband filter (Δλ h / λ c <15%), divided so according to the central wavelength and bandwidth ratio.

l         Stop depth: OD2 – OD6

l         Peak transmittance and central wavelength λ c is related to semi-width Δλ h.

l         Central wavelength deviation

l         Substrate may be tailed to customers' request or be provided by customers.

l         Typical substrate: all kinds of optical glass, quartz glass, Ge, Si, etc.

l         Light transmission can be blocked effectively on extreme broad band by using color glass or double-sided coated glass.

l         Substrate size: Φ2 ~ Φ50 mm; thickness: 0.1 to 20 mm

Advantages:

l         High transmittance of the peak

l         Level pass band spectrum

l         Excellent stoppage within a wide waveband.

l         Superior uniformity

l         Coating: adopt plasma assistant plating and ion sputtering plating, and coating layers are firm, dense and do not absorb moisture.

l         Good stability of temperature and humidity.

Typical bandpass filter:

A.  Broadband bandpass filter

Band Pass: 485-650nm, Tavg>90%

Blocking: UV-450nm&700-1100nm, Tavg<1%

B. Narrowband filter

CWL: 365nm

HW: 7nm  

Tpeak >95%   

Blocking: 270-340nm&405-490nmv

OD>3

C. Infrared bandpass filter

CWL: 4.65μmv     

HW: 0.2μmv 

Tpeak>70%   

Blocking: UV-4.2μm&5.2-8.0μmv     

OD>2

Band Stop Filter

Description:

l         Block spectrum transmission within a certain small waveband.

l         Central wavelength deviation

l         Stop depth:

l         Substrate may be tailed to customer's request or be provided by customers.

l         Typical substrate: all kinds of optical glass, quartz glass, etc.

l         Substrate size: Φ2 ~ Φ50 mm: thickness: 0.1 to 20 mm.

Advantages:

l         High pass band transmittance

l         Level pass band spectrum

l         High stop depth: OD2 – OD6

l         Superior uniformity

l         Coating: to adopt plasma assistant plating and ion sputtering plating, and coating layers are firm, dense and not absorbing moisture.

l         Good stability of temperature and humidity.

Typical band stop filter

CWL: 532nm      

HW: 30nm    

Tavg >90%     

Band pass: 420-515nm & 550-700nmv      

OD>6

Typical Filters

1．Band pass filter 500-600nm 

HB495 colour glass + SP610 filter

2. Band pass filter 600-700nm

HB600 colour glass + SP700 filter

3. Band pass  filter 700-800nm

HB700 colour glass + SP800 filter

4. Band pass filter 800-900nm

HWB800 colour glass + SP900 filter

Remark:

l     Colour glass is wide-band filter.

l     The thickness of glass is 2mm and the thickness of filter is 1.1mm. They are cemented with each other and thus the total thickness is about 3.1mm.