Mass Spectrometer Slit Cutting

2025-12-23

fs-laser slits application

Mass spectrometers act as the "eyes" of modern science, measuring atomic and molecular weights with extreme precision. From biomarker analysis in medical diagnostics to material identification, the resolution and sensitivity of the instrument are paramount.

As a critical component of the Ion Optics system, the Slit functions to focus ion beams and filter trajectories. The edge quality and geometric precision of the slit directly dictate the focusing performance, ultimately determining the accuracy of the final mass spectrum.

Why Traditional Tools Fail

To enhance resolution, slit widths often need to be in the micron range. Traditional methods like EDM or standard lasers face two critical failures:

Rough Sidewalls : Burrs and micro-cracks caused by thermal stress scatter the ion beam, introducing noise and reducing the Signal-to-Noise Ratio.

Unavoidable Taper (V-Shape): Standard lasers naturally create a "V-shaped" taper (wider inlet, narrower outlet). This geometric asymmetry causes deviation in the ion flow, severely compromising measurement accuracy.

Our Breakthrough

Beam Shaping for High Vertical Sidewalls

Traditional Gaussian beams have uneven energy distribution, leading to tapered sidewalls.

We use advanced beam shaping optics to modulate the laser energy profile (e.g., Flat-top or Bessel beams). By precisely controlling the beam's interaction, we achieve 15um slits with highly vertical sidewalls. This ensures the slit width remains consistent from top to bottom, allowing unobstructed ion flow without deflection.

Mastering Hard & Brittle Materials

Beyond standard aluminum molds, femtosecond lasers excel with Ceramic Molds. The process eliminates the micro-cracks and chipping common in mechanical machining. The result is a smooth, polish-free surface ready for high-quality lens transfer.

Ultra-Short Pulse Cold Ablation

Femtosecond lasers (10⁻¹⁵s) ablate material instantly before heat transfer can occur.

Even with extremely narrow slits, we maintain smooth, burr-free, and oxide-free edges. This minimizes ion scattering and maximizes instrument sensitivity.

Custom Slit Arrays

Increasing resolution often comes at the cost of ion throughput.

Based on precise mathematical models, we can fabricate complex slit arrays that significantly increase the instrument's ion throughput without sacrificing resolution. This meets the demanding analysis needs of complex molecules in bio-pharmaceuticals.