Flat Dichroic Mirror HR1800nm HT1300-1500nm 45°

Overview

The Flat Dichroic Mirror HR1800nm HT1300-1500nm 45° (O-DM-25.4-3.0-BL416) is a flat dichroic beam splitter engineered for spectral combining and separation in multi-line femtosecond optical systems. The dielectric coating reflects strongly at 1800 nm while transmitting at 1300 - 1500 nm. It is optimized for an angle of incidence of 45° near a design wavelength of 1800 nm. The UV fused silica substrate carries an IBS-deposited dielectric stack engineered for high reflectance, low scatter, and minimal group-delay distortion of femtosecond and picosecond pulses.

The 25.4 mm diameter form factor integrates directly into Yb-band, Ti:Sapphire, and harmonic-conversion beam paths where damage-tolerant reflectors are required. The IBS coating route delivers consistent batch-to-batch performance and excellent environmental stability under temperature, humidity, and vacuum cycling.

Applications

• Harmonic beam combining and separation
• Pump–probe spectroscopy
• Femtosecond amplifier and OPA beam paths

Construction & Performance

Substrate: UVFS, polished to laser-grade surface quality. Coating: IBS multilayer dielectric, optimized for the 1800 nm design wavelength. Damage threshold: 0.2 J/cm² @100 fs, 1 kHz — sufficient for typical kHz-class femtosecond amplifier outputs. The rear face is fine-ground for non-marring contact in standard kinematic mounts.

Like all WaveQuanta ultrafast optics, this beam splitter ships matched to spec sheet, with reflectance measurements traceable to vendor batch records on request. Pair-matched sets and custom dimensions can be quoted on lead times of 4–8 weeks.

Storage & Handling

Store in original packaging at 25 °C and 40–60 % relative humidity. Clean only with high-purity (≥99 %) ethanol or acetone on lens-grade tissue using the drop-and-drag method. Avoid abrasive cloths, contact between the coating and any solid surface, and water-based cleaners; both can permanently damage the dielectric stack.