UV/Visible Chirped Mirror -100fs²

Overview

The UV/Visible Chirped Mirror -100fs² (Ultrafast Innovations CM2101) is a broadband dispersive mirror (BBDM) that provides -100 fs² of controlled negative group delay dispersion per bounce across the 750–1050 nm operating bandwidth, with a 900 nm center wavelength matched to Ti:Sapphire and broadband Cr-doped sources.

With -100 fs²/bounce, this mirror compensates the dispersion of several millimeters of fused silica or hundreds of millimeters of air per bounce, supporting sub-50 fs pulse compression schemes with manageable bounce counts. Engineered as a single-angle BBDM with optimized GDD flatness, it integrates cleanly into both intracavity and external compressor geometries without requiring matched-pair operation.

Applications

• Ti:Sapphire oscillator and amplifier intracavity dispersion management
• Sub-50 fs pulse compression for OPCPA front-end seeders
• Multi-photon and two-photon fluorescence microscopy excitation lines
• Broadband Cr:LiSAF / Cr:forsterite fs-laser compressor stages

Construction & Performance

Manufactured on a 25.4 mm diameter × 6.35 mm thick UV fused silica (UVFS) substrate with dielectric multilayer coating, >99.9% reflectance specified as R>99.9%@750-1050nm. The mirror operates at 9° angle of incidence with p-polarized light. The dielectric coating delivers low absorption, high layer density, and long-term spectral stability — characteristics required for dependable performance in fs-laser oscillator and amplifier chains.

The 0.2 J/cm² damage threshold (specified at 800 nm) supports typical Ti:Sapphire oscillator and low-rep-rate amplifier fluences. Compatible laser systems include Ti:Sapphire oscillators (Coherent Mira, Spectra-Physics Tsunami), broadband fs amplifier seeders, and OPCPA pump line conditioning.

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.