800nm Chirped Mirror PC1451-L-12.7-6.35-R-50

Overview

The 800nm Chirped Mirror -70fs² (PC1451) from Ultrafast Innovations delivers precise negative group delay dispersion (GDD) of -70 fs² per bounce across the 650–1000 nm spectral range, centered at 825 nm. This broadband dispersive mirror (BBDM) provides moderate dispersion compensation ideal for Ti:Sapphire oscillator intracavity management and compact CPA systems where space constraints limit the number of bounces available.

With its -70 fs² GDD value, this 825nm chirped mirror sits in the sweet spot for standard ultrafast laser configurations requiring moderate GDD compensation without excessive reflections. Compensating typical Ti:Sapphire amplifier dispersions of 5,000–7,000 fs² requires 70–100 bounces, making compact double-pass or folded architectures practical. The 99.8% reflectance across the entire 650–1000 nm bandwidth ensures minimal intracavity losses while maintaining excellent GDD uniformity for sub-50 fs pulse durations.

Applications

• Ti:Sapphire oscillator intracavity dispersion management — compensates positive GVD from gain media and optical elements in sub-20 fs mode-locked systems
• Compact CPA stretcher/compressor stages — folded mirror configurations for table-top femtosecond amplifiers with limited optical path length
• OPCPA pump line chirp correction — pre-compensates dispersion in 800 nm pump beams before parametric amplification stages
• OPA signal path GDD control — fine-tunes group delay in optical parametric amplifier output channels spanning 700–950 nm

Construction & Performance

Manufactured on 12.7 mm diameter × 6.35 mm thick UVFS substrate, the PC1451 features ion beam sputtered (IBS) multilayer dielectric coatings optimized for P-polarization at 5° angle of incidence (AOI). The coating specification guarantees R > 99.8% from 650–1000 nm with laser damage threshold of 0.2 J/cm² for femtosecond pulses. The broadband design maintains GDD compensation performance across the full Ti:Sapphire gain spectrum, enabling octave-spanning pulse compression applications.

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.