LBTEK-Your Trusted Partner For Optoelectronic Experiments!

Raman long-pass filter

Longpass Filter
Cut-On Wavelength: 270 nm-1072 nm
Outer Diameter 25.0 mm, with Mechanical Retaining Ring
Angle of Incidence: 0°

LBTEK Raman long-pass filters include two types: low wavenumber Raman long-pass filters and conventional Raman long-pass filters. They are optical filters that allow light with wavelengths longer than a specific wavelength to pass through. They exhibit high transmittance (Tavg > 90%) for light longer than the starting (cut-off) wavelength and high blocking depth (ODavg > 6) for light shorter than the starting (cut-off) wavelength. The filters are pre-installed in Ø25.0 mm black anodized aluminum rings, with the light propagation direction marked by an arrow on the housing for easy installation and use. Raman long-pass filters are recommended for use at an incident angle of 0°. When used at incident angles deviating from the design angle, the starting (cut-off) wavelength may shift.

Raman long-pass filter installed on the coaxial mounting plate

Product Model	Start (Stop) Wavelength	Wave Number	Diameter	Unit Price	Lead Time
RET1072LP	1072 nm	~96 cm^-1	Ø25.0 mm	$717.25	7 weeks
RET837LP	837 nm	~132 cm^-1	Ø25.0 mm	$717.25	7 weeks
RET792LP	792 nm	~160 cm^-1	Ø25.0 mm	$717.25	7 weeks
RET638LP	638 nm	~177 cm^-1	Ø25.0 mm	$717.25	7 weeks
RET493LP	493 nm	~228 cm^-1	Ø25.0 mm	$717.25	7 weeks
RET359LP	359 nm	~368 cm^-1	Ø25.0 mm	$717.25	7 weeks
RET270LP	270 nm	~271 cm^-1	Ø25.0 mm	$717.25	7 weeks
RET787LP-X	787 nm	~72 cm^-1	Ø25.0 mm	$1074.95	today
RET634LP-X	634 nm	~79 cm^-1	Ø25.0 mm	$1074.95	today
RET533LP-X	533 nm	~94 cm^-1	Ø25.0 mm	$1074.95	7 weeks
RET489LP-X	489 nm	~125 cm^-1	Ø25.0 mm	$1074.95	7 weeks
RET537LP New	537 nm	~209 cm^-1	Ø25.0 mm	$717.25	7 weeks

Raman Dichroic Mirror

Longpass Dichroic Mirror
Reflection Cutoff & Transmission Start Wavelength: 266 nm-785 nm
Ø25.0 mm (Mounted), Ø25.0 mm (Unmounted), 36 mm x 25.5 mm
Incidence Angle: 45°

LBTEK Raman long-pass dichroic mirrors are filters that allow long wavelengths to pass through while reflecting or absorbing short wavelengths. They exhibit high transmittance (Tavg > 90%) for light with wavelengths longer than the cut-on (cut-off) wavelength and high reflectance (Ravg > 90%) for light with wavelengths shorter than the cut-on (cut-off) wavelength. Raman long-pass dichroic mirrors are available in two types: mounted (Ø25.0 mm) and unmounted (Ø25.0 mm & 36 mm x 25.5 mm). For the mounted version, an arrow (↑) engraved on the housing indicates the direction of light propagation, while for the unmounted version, an arrow (>) on the side indicates the direction of the coated surface, facilitating installation and use. Raman long-pass dichroic mirrors are recommended for use at an incident angle of 45°. If the incident angle deviates from the design angle, the cut-on (cut-off) wavelength will shift.

The Raman dichroic mirror is installed on the coaxial mounting plate.

Product Model	Start (Stop) Wavelength	Wave Number	Size	Unit Price	Lead Time
RT633RDC	633 nm	158 cm^-1	Ø25.0 mm (with mounting)	$764.44	7 weeks
RT532RDC	532 nm	209 cm^-1	Ø25.0 mm (with mounting)	$764.44	7 weeks
RT785RDC-R	785 nm	120 cm^-1	36.0×25.5 mm （L×W）	$764.44	today
RT633RDC-R	633 nm	158 cm^-1	36.0×25.5 mm （L×W）	$764.44	today
RT532RDC-R	532 nm	209 cm^-1	36.0×25.5 mm （L×W）	$764.44	today
RT488RDC-R	488 nm	187 cm^-1	36.0×25.5 mm （L×W）	$764.44	7 weeks
RT355RDC-R	355 nm	468 cm^-1	36.0×25.5 mm （L×W）	$764.44	7 weeks
RT266RDC-R	266 nm	271 cm^-1	36.0×25.5 mm （L×W）	$764.44	7 weeks
RT785RDC-UM	785 nm	120 cm^-1	Ø25.0 mm (Not Installed)	$764.44	today
RT532RDC-UM	532 nm	209 cm^-1	Ø25.0 mm (Not Installed)	$764.44	7 weeks
RT266RDC-UM	266 nm	271 cm^-1	Ø25.0 mm (Not Installed)	$764.44	7 weeks

Raman Filters

Center Wavelength: 266 nm-1064 nm
FWHM: 3 nm, 4 nm, 5 nm, 6 nm, 7 nm
Stopband Optical Density: OD5, OD6

LBTEK offers CHROMA Raman Filters with a diameter of 25 mm and mechanical retaining rings. The mechanical retaining rings are marked with arrows indicating the incident direction, with light coming along the arrow direction for easy installation and use. When the incident angle deviates from the designed angle, the center wavelength may shift. It is recommended to use at the designed angle.

The Raman filter is mounted on the coaxial mounting plate.

Product Model	Center wavelength	Full Width at Half Maximum (FWHM)	Passband transmittance	Unit Price	Lead Time
RET785/3x	785 nm	3 nm	Tabs>90%@785 nm	$717.25	today
RET633/3x	633 nm	3 nm	Tabs＞90%@632.8 nm	$717.25	7 weeks
RET532/2x	532 nm	2 nm	Tabs＞90%@532 nm	$717.25	7 weeks
RET1064/7x	1064 nm	7 nm	Tabs＞90%@1064 nm；	$717.25	today
RET830/6x	830 nm	6 nm	Tabs＞93%@830 nm；	$717.25	today
RET785/6x	784.5 nm	6 nm	Tabs＞93%@785 nm；	$717.25	today
RET633/5x	632.3 nm	5 nm	Tabs＞93%@632.8 nm；	$717.25	today
RET532/4x	532 nm	4.5 nm	Tabs＞93%@532 nm；	$717.25	today
RET488/4x	487.7 nm	4.2 nm	Tabs＞93%@488 nm；	$717.25	today
RET355/3x	355 nm	3 nm	Tabs＞88%@355 nm；	$717.25	today
RET266/3x	266 nm	3 nm	Tabs＞55%@266 nm；	$717.25	today