800nm Chirped Mirror PC125-S-25.4-6.35

Overview

The 800nm Chirped Mirror -60fs² (Ultrafast Innovations PC125) delivers precise negative GDD compensation of -60 fs² per bounce across the 630–1000 nm bandwidth, centered at 815nm. This broad-band dispersive mirror (BBDM) is engineered specifically for Ti:Sapphire oscillators and chirped pulse amplification (CPA) systems requiring moderate intracavity or compressor-stage dispersion control without excessive bounce count.

At -60 fs² per reflection, this chirped mirror occupies the sweet spot for standard sub-100 fs laser systems: aggressive enough to minimize mirror pair count while maintaining excellent GDD flatness across the Ti:Sapphire gain bandwidth. For typical oscillator cavity geometries introducing 3000–6000 fs² of positive material dispersion, 50–100 bounces provide complete compensation, making this GDD value ideal for double-pass configurations and compact folded resonators. The P-polarization optimization at 7° AOI ensures seamless integration into Brewster-cut or wedged cavity designs.

Applications

• Ti:Sapphire Oscillator Dispersion Management: Intracavity GDD compensation for sub-50 fs mode-locked systems operating at 800 nm
• CPA Pre-Compression: Front-end stretcher/compressor tuning in chirped pulse amplification chains for optical parametric chirped pulse amplification (OPCPA) pump conditioning
• OPA Signal Path Control: GVD compensation in 700–900 nm optical parametric amplifier signal arms to maintain transform-limited pulse duration
• Multi-Pass Amplifier Tuning: Fine GDD adjustment in regenerative or multi-pass Ti:Sapphire amplifiers with 4–12 bounce geometries

Construction & Performance

Manufactured on 25.4 × 6.35 mm UVFS substrates using ion beam sputtering (IBS) to achieve R>99.7% reflectance from 630–1000 nm. The multilayer dielectric coating architecture maintains <±10 fs² GDD ripple across the operational bandwidth while providing 0.2 J/cm² laser-induced damage threshold for femtosecond pulses. P-polarization-optimized at 7° angle of incidence ensures compatibility with standard Brewster-angle cavity configurations and folded beam paths in commercial Ti:Sapphire systems.

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.