CVI PM-2037 longpass dichroic beamsplitter pair 488 514nm – LOT OF 2

Product Description

Matched Pair: Premium High-Performance Longpass Dichroic Beamsplitter – CVI Laser PM-2037 Series, Argon-Ion Optimized (488/514 nm High Reflection) – 50mm Diameter

A high-quality matched pair of 50.8 mm (2″) diameter × 9.5 mm thick longpass dichroic mirrors from CVI Laser Optics, engineered specifically for argon-ion laser lines at 488 nm and 514 nm. Delivering >95–99% reflection at 45° angle of incidence (AOI) with a steep transition edge (~520–530 nm) for high transmission of longer red/NIR wavelengths, these are professional-grade dichroics designed for the era when multi-line argon lasers dominated fluorescence microscopy and spectroscopy.

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🔍 Key Specifications:

• Manufacturer: CVI Laser Optics (now part of IDEX)

• Series: PM-2037

• Diameter: 50.8 mm (2 inches)

• Thickness: 9.5 mm (oversized for beam displacement and thermal stability)

• Substrate: UV-grade fused silica – low autofluorescence, high LIDT, exceptional thermal stability

• Angle of Incidence: 45° (design angle)

• Reflection Band: 488 nm & 514 nm – >95–99% reflectance, multi-line argon-ion optimized

• Transition Edge: ~520–530 nm (steep longpass cutoff)

• Transmission Band: >520–530 nm to NIR – low loss

• Coating: Multi-layer dielectric hard coat (primary side); broadband AR coating (back side)

• Beam Displacement: ~6–7 mm lateral offset at 45° due to 9.5 mm thickness

• Condition: Fully functional, pristine central apertures

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✅ Condition & Notes:

Both optics are fully functional with pristine central clear apertures. Minor cosmetic imperfections are confined to extreme edges or non-critical rear surfaces:

🔹 Optic 1: Small ~4 mm hairline on extreme edge – no impact on beam path or performance
🔹 Optic 2: Some streak on rear (non-beam-facing) side outside central 25 mm aperture – does not affect primary reflection

Includes: Lenses only – no mounting cells or holders

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⚙️ Why This Dichroic Pair is Exceptional:

💎 UV-Grade Fused Silica Substrate:
Unlike BK7-based dichroics, UV-grade fused silica offers:

• Near-zero autofluorescence – critical for sensitive fluorescence detection

• High laser damage threshold – handles multi-watt argon-ion excitation

• Minimal thermal drift – stable performance over hours of operation

📏 Oversized 9.5 mm Thickness:
The extra thickness provides:

• ~6–7 mm lateral beam displacement at 45° – prevents overlap between reflected excitation and transmitted emission beams

• Exceptional mechanical rigidity – no flexure in automated stages

• Superior thermal mass – resists heating under high-power illumination

🔬 Argon-Ion Optimized:
Specifically engineered for the two most powerful lines of the multi-line argon-ion laser:

• 488 nm – excites FITC, Alexa Fluor 488, GFP, Cy2

• 514 nm – excites YFP, Rhodamine, Alexa Fluor 514

🎯 Steep Transition Edge:
The ~520–530 nm cutoff cleanly separates green fluorescence from red-shifted emission – ideal for ratiometric imaging and multi-color detection.

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🛠️ Applications & Uses:

🔬 Fluorescence & Confocal Microscopy:
Mounted at 45° in the optical path:

• Reflects 488/514 nm excitation toward the sample

• Transmits red-shifted Stokes fluorescence (GFP, YFP, Rhodamine emission) to detectors

• Direct replacement for legacy systems:

  • Zeiss LSM 410/510/710

  • Leica SP2/SP5

  • Nikon C1/C2

  • Olympus FV300/FV1000

  • Bio-Rad/Zeiss Radiance

💡 Argon-Ion Laser Systems:

• Clean separation of 488/514 nm lines from white-light/multi-line output

• Beam combining for multi-color excitation

• Wavelength routing in custom laser engines

📊 Raman Spectroscopy:

• Reflects 488/514 nm excitation to sample

• Transmits weak red-shifted Raman scatter for detection

• Minimal autofluorescence – critical for low-signal measurements

🔧 Custom Optical Systems:

• High-power beam routing – handles multi-watt argon lasers

• Holography & interferometry – stable, thermally compensated substrate

• Educational demonstrations – teach dichroic principles with vintage laser hardware

🛡️ Spares & Redundancy:

• Perfect matched pair for critical multi-channel setups

• Backup optics for labs maintaining vintage instrumentation

• Cost-effective acquisition of hard-to-find CVI PM-2037 series optics