248nm 250nm UV Band Pass Filter For Raman Spectroscopy

UV Bandpass Optical Filters selectively transmit a particular portion of the spectrum that ranges from 10 to 400nm while simultaneously blocking out other wavelengths. This property of UV Bandpass Filters makes them highly desirable for various applications, including but not limited to the biochemical, enzyme, and nucleic acid detection equipment and for use in laser equipment and optical measurement instruments.

 

Our 248nm 250nm UV Band Pass Filter features a highly accurate central wavelength of 250nm and a customizable full width at half maximum (FWHM) of 10nm with an optical density (OD) of 2-6. These filters are made of high-quality optical glass, UVFS, Sapphire, Si, or Ge, with a surface quality of 60-40 or 40-20, and coated with an IAD Hard Coating process. UVWAVETEK's UV Bandpass Filters have a high transmission rate and are highly customizable, with OEM and ODM support.

 

Features

- Narrow bandpass for 250nm

- Accurate wavelength

- Highly scratch-resistant

- High signal to noise ratio

- Deeply customized

- High transmittance

- ISO9001 certified

 

Parameters

Product Name	250nm bandpass filter
Central Wavelength (CWL)	250nm
FWHM	20nm or custom
Diameter	6.5-50mm or custom
Thickness	1mm or custom
Transmission Rate	>85%
Blocking depth	OD3 or custom
Coating	Hard film coating
Tolerance	±0.01-0.1mm
Wavelength range:	200-1100nm

 

Spectrum transmission curve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Applications

248nm & 250nm UV bandpass glass have a variety of applications for controlling and manipulating light in scientific, industrial, and medical fields. Some of the common applications are:

- Fluorescence microscopy

- Photolithography

- Sterilization in medical facilities

- Water purification

- Environmental monitoring

- Scientific research in protein analysis, DNA sequencing, and photo-biology

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Why we don’t use traditional Raman Spectroscopy nowadays?

Drawbacks of Traditional Raman Spectroscopy：

Traditional Raman spectroscopy is very easy to produce fluorescence in the visible region, and the fluorescence intensity is often tens of thousands or even millions of times that of Raman intensity. Besides, the intrinsic sensitivity of traditional Raman spectroscopy is very low. These two problems are particularly prominent in catalysis research. Therefore, eliminating or avoiding the interference of surface fluorescence and improving sensitivity are the keys to the successful application of Raman spectroscopy in situ catalysis research.

 

Aiming at the two problems of fluorescence interference and low sensitivity, Chinese scientists proposed developing a UV Raman spectrometer using a continuous wave UV laser with 248nm 250nm UV Band Pass Filter as the excitation light source. After overcoming a series of experimental difficulties, the first UV Raman spectrum instrument applied to catalysis research in China was built in 1997.

 

Theoretically, the UV Raman spectrometer has the following advantages:

- The fluorescence mainly appears in the visible region; shifting the excitation wavelength to the ultraviolet band can effectively avoid the fluorescence;

- The light scattering intensity is inversely proportional to the fourth power of the wavelength; shifting the excitation wavelength to the ultraviolet region can improve the sensitivity;

- The electronic absorption bands of many compounds are in the ultraviolet area, so ultraviolet resonance Raman light can be performed, which improves the instrument's sensitivity by several orders of magnitude.

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