Low Fluorescence Optical Raman Grade CaF2 Calcium Fluoride Window for Precision Optics

Name: Low Fluorescence Optical Raman Grade CaF2 Calcium Fluoride Window for Precision Optics
Brand: Henan UM Optics Ltd
Availability: InStock

Description

Raman-grade calcium fluoride (CaF₂) windows are high-purity optical components engineered for precision Raman spectroscopy and broadband optical systems. Featuring an ultra-wide transmission range from deep ultraviolet (130 nm) to mid-infrared (10 μm), they deliver exceptional transmittance across critical spectral bands. A defining trait is their minimal fluorescence and a single, narrow Raman peak at 321 cm⁻¹, eliminating spectral interference and ensuring high signal-to-noise ratios. With low dispersion, high chemical stability, and resistance to thermal shock, these windows maintain optical integrity in demanding environments. Ideal for Raman microscopes, laser systems, and infrared spectroscopy.

Specifications

Substrate Material:	CaF2
Antireflection Coating:	Uncoated
Diameter:	20 mm
Surface Quality:	20-10 scratch-dig, 40-20 scratch-dig, 60-40 scratch-dig
Surface Flatness:	lambda/6, lambda/4
Thickness:	2 mm

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Features

Raman Grade Specificity: Optimized with specially purified crystal composition to suppress spontaneous Raman scattering
Ultra-low Intrinsic Fluorescence: Effectively reduces background luminescence, ideal for weak signal collection in spectral analysis
Natural Broadband Transparency: Inherent wide spectral transmission from deep UV to mid-infrared without additional coating
Low Raman Activity: Weak and stable intrinsic Raman signal, avoiding overlap with sample characteristic peaks
Inert Crystal Property: Excellent chemical inertness, not easy to react with common laboratory and corrosive media
Low Thermal Radiation: Stable molecular structure, less thermal radiation interference under continuous illumination

Applications

Raman Spectroscopy: Specialized for conventional and micro-Raman testing to acquire pure sample spectral data
Spectral Analysis Instruments: Applied in UV-MIR broadband analytical optical systems for scientific testing
Laboratory Research: Used in material characterization, molecular detection and biochemical research scenarios
High-precision Optical Testing: Matches low-background optical detection and high-sensitivity experimental platforms
Laser Assisted Analysis: Adapted to continuous laser irradiation in optical analysis and testing equipment

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Frequently Asked Questions

What makes Raman grade CaF₂ windows different from standard optical CaF₂ windows?

The key difference is internal crystal purity and inherent spectral background. Raman grade CaF₂ is produced with strict recrystallization and deep impurity reduction to minimize lattice defects and trace contaminants. It delivers extremely low intrinsic fluorescence and very weak Raman scattering, while standard CaF₂ contains more impurity-related background signals. Only Raman grade material ensures no substrate interference to weak sample Raman signals during spectral testing.

Why is Raman grade calcium fluoride ideal for high-sensitivity Raman spectroscopy?

Raman grade CaF₂ features ultra-low Raman activity with only one weak, stable intrinsic Raman peak at 321 cm⁻¹. This inherent signal will not overlap with most organic, inorganic and polymer sample characteristic peaks. It effectively eliminates substrate background noise, preserves original sample spectral information, and perfectly fits low-concentration sample testing and weak signal Raman measurement.

What chemical and optical stability does Raman grade CaF₂ provide for long-term testing?

Raman grade CaF₂ exhibits excellent chemical inertness and stable crystal structure. It resists corrosion from common laboratory solvents and routine acid-base media. The material will not produce extra fluorescence or new scattering signals after long-term laser irradiation, maintaining consistent optical performance and reliable repeatability for continuous Raman experiments.

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