Multi-focal laser processing in transparent materials using an ultrafast tunable acoustic lens

Area of Science:

• Optics and Photonics
• Materials Science
• Laser Technology

Background:

• Precise control over focal position is essential for advanced laser processing techniques.
• Existing methods for focal manipulation can be slow or lack versatility.
• Ultrafast laser processing offers high precision but requires adaptable focusing capabilities.

Purpose of the Study:

• To implement and characterize an ultrafast, variable focal system for multi-focal laser processing.
• To demonstrate the system's flexibility in controlling focal positions for intra-volumetric modification.
• To showcase the potential for efficient laser machining on transparent materials.

Main Methods:

• Utilized a tunable acoustic gradient of index (Luneberg) lens for variable focusing.
• Employed femtosecond laser-induced intra-volumetric modification in glass.
• Characterized the system's ability to achieve multi-focal laser processing.

Main Results:

• Successfully implemented and characterized an ultrafast, variable focal system.
• Demonstrated precise control over focal positions for selective volumetric modification in glass.
• Achieved simultaneous laser machining on both surfaces of a glass slide in a single scan.

Conclusions:

• The tunable acoustic gradient of index lens system provides a versatile and fast method for multi-focal laser processing.
• This technology enhances control for applications requiring precise volumetric modification and parallel processing.
• The system offers a novel approach for efficient machining of transparent materials.