800nm Chirped Mirror PC1451-L-12.7-6.35

Overview

The 800nm Chirped Mirror -70fs² (PC1451-L-12.7-6.35) from Ultrafast Innovations delivers precisely controlled negative group delay dispersion (GDD) of -70 fs² per bounce centered at 825 nm, engineered for fine-tuned dispersion management in Ti:Sapphire oscillators and chirped pulse amplification (CPA) systems. This broad-band dispersive mirror (BBDM) operates across a 650–1000 nm wavelength range, making it ideal for standard sub-100 femtosecond pulse compression where moderate GDD compensation is required without excessive bounces.

At -70 fs² per reflection, this chirped mirror strikes an optimal balance between compact cavity design and effective GVD compensation. Unlike higher-magnitude GDD mirrors requiring fewer bounces but greater sensitivity to alignment, or ultra-low GDD mirrors demanding impractically long beam paths, this 825nm chirped mirror configuration enables approximately 86 reflections to compensate 6000 fs² of material dispersion—practical for multi-pass amplifier architectures and oscillator intracavity compensation. The 99.8% reflectance across the full bandwidth minimizes loss accumulation in multi-bounce geometries essential for OPCPA and OPA pumping systems.

Applications

• Ti:Sapphire oscillator intracavity dispersion management for sub-50 fs pulse generation with fine GDD tuning
• Multi-pass CPA compressor stages requiring moderate negative dispersion compensation between 700–900 nm
• OPCPA pump line dispersion control for temporal synchronization in parametric amplification at 800 nm
• Ultrafast beam transport in Ti:Sapphire amplifier chains compensating for material GVD in optics and gain media

Construction & Performance

Manufactured on 12.7 mm diameter, 6.35 mm thick UVFS substrates, this mirror features ion beam sputtered (IBS) multilayer coatings optimized for P-polarization at 5° angle of incidence (AOI). The coating maintains R > 99.8% from 650–1000 nm with LIDT rated at 0.2 J/cm² for femtosecond pulses. The precision thin-film design ensures flat GDD response across the operational bandwidth, critical for preserving pulse fidelity in GDD compensation applications demanding minimal higher-order dispersion.

Storage & Handling

Operate at 25 °C, 40–60% RH. Clean only with >99% optical-grade ethanol and lint-free lens tissue using single-pass drag method. Avoid abrasive cloths and water.