LP370 Longpass Filter (T>85%@380-1100nm, OD5@200-360nm)

LP370 Longpass Filter (T>85%@380-1100nm, OD5@200-360nm)

Cut-on=370nm / T>85%@380-1100nm // OD5@200-360nm / dia12.5mm(unmounted)
$50.00
$50.00
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LP370 Longpass Filter (T>85%@380-1100nm, OD5@200-360nm)
  • LP370 Longpass Filter (T>85%@380-1100nm, OD5@200-360nm)
LP370 Longpass Filter (T>85%@380-1100nm, OD5@200-360nm)

LP370 Longpass Filter (T>85%@380-1100nm, OD5@200-360nm)

SO3040009
Cut-on Wavelength
Cut-on Wavelength
Cut-on=370nm
Transmission // Blocking
Transmission // Blocking
T>85%@380-1100nm // OD5@200-360nm
SO3040009-d12.5u
In stock
$50.00
$50.00
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Stock Availability

Yes. Listed filters are generally available from stock, but final availability may depend on size and quantity.

  • Most filters are kept as medium-sized coated pieces
  • Final size is usually diced before shipment
  • Preparation time may vary for urgent orders, custom sizes, or larger quantities
Custom Size & Mounting

We can usually cut optical filters to custom outer sizes, depending on available coated material.

Custom size
  • Typical custom size range: 3 × 3mm to 60 × 60mm
  • Custom sizing changes the outer dimension only
  • Thickness normally follows the original filter specification
  • Final feasibility depends on coated material size and cutting requirements
Mounting
  • Standard mounting options are
    dia12.5mm (mounted) - OD = dia12.5mm,Thickness=3.5mm,No Thread
    dia25mm (mounted) - OD = dia25mm,Thickness=3.5mm,No Thread
  • Mounted options can include non-threaded or threaded mounts
  • Custom mounting may be possible depending on quantity and mechanical requirements
Note
  • Please send the required size, quantity, mounting type, and product link before ordering.
Request Raw Data

Yes. You may request the transmission curve or related spectral data for engineering review.

Copy the link of the product page and send email to shop@syronoptics.com, you will get reply within 1 working days.
Shipment & Delivery

We ship optical products to most supported regions, with shipping cost and delivery method confirmed before payment.

Shipping cost
  • Shipping is generally USD 5–40 per parcel
  • Orders above USD 300 are eligible for free shipping
  • Final cost depends on destination, package size, order value, and shipping method
  • Shipping cost is shown during checkout or confirmed before payment
Shipping coverage
  • We generally ship to Europe, North America, Asia, the Middle East, and Oceania
  • Some countries may be unavailable depending on logistics or customs conditions
Delivery time
  • Most stocked products need 1–5 working days for preparation before shipment
  • After shipment, delivery time depends on destination and shipping method
  • Tracking information will be provided when available
Note
  • If your destination is not available during checkout, please contact us before ordering.
Payment & Quotation

You can order online, request a quotation, or use bank transfer depending on your purchasing process.

Can I request a quotation before ordering?
  • Yes, formal quotations are available before payment
  • Recommended for company purchases, larger quantities, custom sizes, or special shipping requirements
  • Please send the product link, quantity, destination country, and billing details if available
What online payment methods are available?
  • Credit card
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Do you support bank transfer?
  • Yes, bank transfer is available
  • We support multi-currency payment through local banking where available
  • Local receiving accounts may include US, UK, Germany, Singapore, and Hong Kong bank accounts
  • For payment in Chinese RMB inside Mainland China, please contact our local partner
  • VAT fapiao may be supported for eligible Mainland China transactions
Do you support company purchase orders?
  • Company purchase orders may be supported after confirmation
  • Please contact us before ordering if your organization requires PO processing, quotation, or invoice matching
Are NET payment terms available? (Pay after received)
  • NET 7 or NET 30 terms may be available for eligible organizations
  • Approval depends on company type, order value, payment history, and internal review
  • Please contact us before ordering if you need NET payment terms
Import, Duties & Customs

mport duties, taxes, and customs handling depend on your destination country and shipping method.

Are duties and taxes included?
  • For express courier services such as DHL or FedEx, duties, taxes, and customs handling are usually paid by the buyer
  • The final import cost depends on destination country, declared value, and local customs rules
  • Duties and taxes are not included unless clearly confirmed before payment
Can SyronOptics help with import clearance?
  • Import-handled delivery may be available for selected regions
  • Supported regions may include USA, Canada, United Kingdom,Europe, Mainland China, Hong Kong, Singapore, Australia, and New Zealand
  • With import-handled delivery, we help arrange clearance and local delivery
  • This option may be slower than express courier
Note
  • If you are not sure, please contact us to confirm whether import-handled delivery is supported in your region.

This LP370 longpass filter is designed to transmit wavelengths longer than the cut-on region while reducing shorter-wavelength UV light. It is suitable for fluorescence imaging, optical sensing, and detector protection systems where longer-wavelength signal needs to be separated from UV excitation or short-wavelength background. It helps reduce unwanted UV light while preserving the longer-wavelength signal for measurement or imaging.

Key specifications:

  • Wavelength / main spec: 370 nm cut-on wavelength
  • Bandwidth / transition spec: See specification table for transition characteristics
  • Transmission / blocking: T>85% from 380-1100 nm ;  OD5 from 200-360 nm
  • Format / custom option: Available in 25.4 mm diameter and 60x60mm, mounting options
LP370 Longpass Filter - Fluorescence Microscopy

LP370 Longpass Filter - Fluorescence Microscopy (Emission Filter for UV Dyes)

Fluorescence Microscopy (Emission Filter for UV Dyes)

This is the most likely application. In fluorescence, you excite a sample with UV light, and it emits visible blue light. You need to block the dangerous/blinding UV light from reaching the detector (or your eye) while letting the faint blue fluorescence through.

  • Target Fluorophores: DAPI, Hoechst 33342, Hoechst 33258, AMCA.
  • How it works: These dyes absorb UV light (~350–360nm) and emit blue light (~450–460nm). The LP370 blocks the excitation UV (OD5 ensures dark background) but passes the blue emission signal.

Recommended Light Sources

  • UV LED 365 nm: This is the ideal partner. The LED pumps energy at 365nm (which the filter blocks), causing the sample to fluoresce at >400nm (which the filter passes).
  • UV Laser 355 nm (Nd:YAG) or 375 nm (Diode): Note: If using a 375nm laser, this filter might be too close to the laser line (cut-on is 370nm). You would need a 355nm laser for this specific filter to work effectively.
  • Mercury (Hg) Arc Lamp Broadband UV (peaks at 365nm): Traditional source for fluorescence microscopes. The filter effectively blocks the strong UV emission lines.
LP370 Longpass Filter - UV Raman Spectroscopy

LP370 Longpass Filter - UV Raman Spectroscopy

UV Raman Spectroscopy

If you are performing Raman spectroscopy using a UV laser (e.g., 355nm), this filter serves as the Rayleigh Rejection Filter.

  • How it works: The laser hits the sample, scattering mostly laser light (Rayleigh scatter) and a tiny amount of "Raman shifted" light (longer wavelengths). The LP370 blocks the blinding 355nm laser light (OD5) but lets the Raman signal (which appears at >370nm) pass through to the spectrometer.

Recommended Light Sources

  • Frequency-Tripled Nd:YAG Laser: The industry-standard "workhorse" for this application is a Diode-Pumped Solid-State (DPSS) Nd:YAG Laser emitting at 355 nm.
  1. Laser Medium: Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG).
  2. Mechanism: The laser generates a fundamental wavelength of 1064 nm. Through non-linear optical crystals, this frequency is tripled (Third Harmonic Generation) to produce 355 nm ultraviolet light.

Similar Bandpass Filters

Product Faqs

Cut-on / cut-off wavelength

Cut-on / cut-off wavelength is the transition point where an edgepass filter starts or stops transmitting light; in a practical system, it defines which wavelength range is allowed through and which range is reduced or blocked.
Blocking region

Blocking region is the wavelength range where the filter is designed to suppress unwanted light; in a practical system, stronger or wider blocking helps reduce background signal, stray light, and detector interference.
Optical Density (OD)

Blocking depth / optical density (OD) describes how strongly unwanted light is suppressed in the blocking region; for example, OD6 @ 200–1200nm means the filter is designed to block wavelengths from 200–1200nm to about 0.0001% transmission, helping reduce stray light, background signal, and detector overload.
Angle of incidence (AOI)

Angle of incidence (AOI) is the angle at which light hits the filter surface; as AOI increases, interference filters can show a spectral shift, usually moving the transmission or transition wavelength toward shorter wavelengths.

Need Help Confirming This Filter?

Whether you are replacing an existing part or building a new system, send us:
- Original part number or target specification
- Required size and quantity
- Application or system goal

We will help check product fit or suggest a stock/custom alternative.