产品: Shortpass Filter

Shortpass Filter

Optical shortpass filters are precision components designed to transmit shorter wavelengths while blocking longer wavelengths above a specific cut-off point. TIHOT Optics provides high-performance shortpass filters spanning UV to IR wavelengths, featuring hard dielectric coatings for superior transmission in the passband and excellent blocking in the rejection band.

Key Features

Precise Cut-Off Wavelength Control Cut-off wavelength range from 250 nm to 3000 nm, providing precise control over spectral separation with customizable edge positions for specific applications.

Excellent Short-Wave Transmission High transmission >90% in the passband region ensures maximum signal throughput for shorter wavelengths with minimal optical loss.

Superior Long-Wave Blocking Deep blocking up to OD6 in the rejection band effectively eliminates unwanted longer wavelengths, ensuring high spectral purity and contrast.

Steep Edge Transition Sharp transition between passband and blocking region (typically <5% of cut-off wavelength) enables precise wavelength separation for demanding applications.

Durable Hard Dielectric Coating Hard multilayer dielectric coating ensures long-term stability, environmental resistance, and maintains performance under harsh operating conditions.

Broad System Compatibility Compatible with fluorescence microscopy, Raman spectroscopy, laser systems, and imaging equipment for versatile integration across optical systems..

Typical Specifications

Parameter	Specification Range	Description
Cut-Off Wavelength (λc)	250–3000 nm	Wavelength at 50% transmission point
Passband Transmission (T%)	>90% typical, up to >95%	Transmission efficiency below cut-off wavelength
Blocking Level	OD4–OD6	Long-wavelength rejection above cut-off
Edge Steepness	<5% of λc typical	Transition width from 10% to 90% transmission
Blocking Range	λc to λc + 200–500 nm	Extended blocking region specification
Substrate Material	Fused Silica, Borosilicate, BK7	Material selected by spectral region requirements
Coating Type	Hard dielectric multilayer	High durability and thermal stability
Diameter/Size	5–100 mm (custom available)	Round or square shapes available
Surface Quality	40–20 / 20–10	Precision optical grade per MIL-PRF-13830B
AOI (Angle of Incidence)	0°–10°	Edge shifts toward shorter wavelengths with angle
Operating Temperature	-40°C to +85°C	Stable performance across temperature range
Parallelism	<3 arcsec	Minimizes beam deviation in precision setups
Thickness Options	1–5 mm	Standard and custom thickness available

Applications

Our shortpass filters serve critical functions across multiple industries and research fields:

Fluorescence Microscopy Excitation – Block emission wavelengths while transmitting excitation light in multi-color fluorescence imaging, preventing emission bleed-through and improving image contrast in DAPI, CFP, GFP, and YFP channels.

Raman Spectroscopy – Eliminate Rayleigh scattering and laser line transmission while allowing Stokes-shifted Raman signals to pass, essential for high-sensitivity molecular fingerprinting and chemical identification.

Color Separation Systems – Enable precise RGB channel separation in color cameras, multispectral imaging, and scientific photography by transmitting specific wavelength ranges while blocking unwanted longer wavelengths.

Laser Beam Cleanup – Remove unwanted longer-wavelength harmonics and spontaneous emission from laser sources, ensuring spectral purity in laser-based instrumentation and materials processing.

Custom Shortpass Filter Solutions

TIHOT Optics offers comprehensive customization services to meet specific application requirements. Our engineering team can design and manufacture shortpass filters with custom cut-off wavelengths, edge steepness specifications, blocking ranges, and physical dimensions tailored to your exact specifications.

Custom Options Available:

- Custom cut-off wavelengths across 250–3000 nm range

- Ultra-sharp edge transitions (<2% of cut-off wavelength)

- Extended blocking ranges (>1000 nm beyond cut-off)

- Non-standard sizes and shapes (rectangular, square, custom diameters)

- Enhanced coating designs for high-power laser cleanup applications

- Specialty substrate materials for UV or extended IR ranges

- Dual-side coating for reduced back-reflection

- Custom blocking depth requirements (OD7, OD8 available)

- Temperature-stabilized designs for precision instrumentation

Contact our technical sales team to discuss your requirements and receive a detailed quotation for custom shortpass filter solutions. We provide full spectral characterization data and certification documentation with all custom filters.