Micro-Nano Processing: Femtosecond Laser vs. Picosecond Laser – How to Choose Tool?
In high-precision fields such as microelectronic manufacturing, medical device R...
MONO | 2025-11
INDUSTRY
At the microscale, etching dimple structures on device surfaces endows products with new properties, such as reduced friction. Traditional micro-milling and Micro-EDM (Electrical Discharge Machining) are limited by the shape and controllability of machining tools in surface micro-texturing, making it hard to achieve ideal results. Femtosecond laser technology, however, is a game-changer. With its "cold machining" characteristic, it delivers unparalleled precision and control, easily solving the challenges of high-quality dimple structure machining.
Femtosecond lasers, with their ultra-short pulse duration (10⁻¹⁵ seconds), complete material ablation before the material absorbs energy and conducts heat. This unique "cold ablation" mechanism fundamentally addresses the pain points of traditional machining, bringing unparalleled advantages:
Micro-texturing of circular dimples on metal substrates: (a) Aluminum, (b) Copper, (c) Nickel, (d) AISI430.
• High-Precision Micromachining: Capable of machining features as small as 10µm or even smaller.
• High-Quality Surfaces: Nanoscale roughness control for precise texture design.
• Broad Material Adaptability: Suitable for metals, ceramics, polymers, and other materials – including high-hardness materials like carbides and ceramics.
• Minimal Heat-Affected Zone: Ultra-short pulse duration avoids material melting, burrs, and other damages.
• Non-Contact Machining: No mechanical contact, reducing contamination and tool wear.
• Strong Controllability: Precisely control the geometry and arrangement of microstructures.
Achieving ideal dimple structures requires not only advanced tools but also sophisticated process control. Geometric parameters such as hole diameter, depth, depth-to-diameter ratio, and array spacing collectively determine machining quality. Our equipment supports:
1. Flexible Machining: Create dimples of different sizes and shapes flexibly via methods like percussion drilling or spiral scanning.
2. Controllable Parameters: Precisely adjust laser pulse energy, frequency, scanning speed, etc., to fully customize dimple diameter, depth, and shape (circular, square, hexagonal, irregular dimples).
3. Efficient Mass Production
Combining a high-speed scanning system, visual positioning system, and high-repetition-rate femtosecond laser, our equipment can efficiently machine thousands of microcavity units on materials at once with high consistency, meeting industrial mass production needs.
High-quality dimple arrays manufactured by femtosecond lasers are ideal for improving the tribological performance of components. The core mechanisms are:
• Micro-Hydrodynamic Bearing Effect: In lubricated relative motion, countless micro-dimples act like mini bearings, generating a hydrodynamic pressure effect that separates the friction pair surfaces, significantly reducing the friction coefficient. For example, applying this technology to automotive piston rings can effectively reduce friction power consumption and improve fuel economy.
• Debris "Trap" Function: Dimple structures can effectively capture and store tiny debris generated during wear, preventing secondary scratches and abrasive wear on friction surfaces.
• Lubricant Reservoir: Dimples serve as mini lubricant reservoirs, continuously supplying lubrication to friction surfaces under harsh or oil-poor conditions, greatly improving component reliability and service life.
Clinical Pain Point: In ultrasound-guided oocyte aspiration surgery, traditional needle tips have poor imaging effects. Doctors struggle to accurately determine the needle tip position, increasing surgical risks and patient discomfort.
Femtosecond Laser Solution: We use femtosecond lasers to precisely etch micro-dimple arrays (0.12mm in diameter, 50μm in depth) on the tip of oocyte aspiration needles.
Achieved Functional Leap:
• Enhanced Ultrasound Imaging: These micro-dimple arrays significantly boost the scattering and reflection of ultrasound waves by the needle tip, making it appear clear and bright in ultrasound images.
• Improved Surgical Safety & Success Rate: Doctors can track the needle tip trajectory in real-time and accurately, enabling precise follicle puncture – significantly increasing surgical success rates while reducing the risk of damage to surrounding tissues.
• Superior Machining Quality: The entire process is free of carbonization and burrs, with a smooth surface, fully meeting the strict standards of medical devices.
From improving the energy efficiency of traditional machinery to empowering innovations in precision medicine, femtosecond laser technology is constantly expanding the boundaries of our imagination in micromachining – becoming a powerful tool for creating differentiated, high-value-added products. We provide high-performance, high-stability femtosecond laser micro-nano machining systems and comprehensive process solutions, helping customers achieve new breakthroughs in dimple etching and other micro-texturing applications.
