Laser Optics - F-Theta Lenses

Part Number	Description / PDF	Quantity
4401-524-000-21 Excelitas Technologies	F-THETA-RONAR; F=330MM/WL=940-98	3
4401-590-000-26 Excelitas Technologies	F-THETA-RONAR; FUSED SILICA; LOW	3
4401-607-000-26 Excelitas Technologies	F-THETA-RONAR; TELECENTRIC; FUSE	3
4401-587-000-26 Excelitas Technologies	F-THETA-RONAR; FUSED SILICA; LOW	3
4401-485-000-21 Excelitas Technologies	F-THETA-RONAR; F=330MM/WL=532NM;	3
4401-589-000-26 Excelitas Technologies	F-THETA-RONAR; FUSED SILICA; LOW	0
4401-499-000-26 Excelitas Technologies	F-THETA-RONAR; FUSED SILICA; LOW	9
4401-508-000-26 Excelitas Technologies	F-THETA-RONAR; FUSED SILICA; LOW	5
4401-302-000-21 Excelitas Technologies	F-THETA-RONAR; F=100MM/WL=1064NM	7
4401-576-000-21 Excelitas Technologies	F-THETA-RONAR; TELECENTRIC; FUSE	3
4401-481-000-21 Excelitas Technologies	F-THETA-RONAR; FUSED SILICA; F=2	2
4401-551-000-26 Excelitas Technologies	F-THETA-RONAR, TELECENTRIC; FUSE	2
4401-525-000-21 Excelitas Technologies	F-THETA-RONAR; F=420MM/WL=940-98	2
4401-305-000-21 Excelitas Technologies	F-THETA-RONAR; F=160MM/WL=532NM;	3
4401-301-000-21 Excelitas Technologies	F-THETA-RONAR; F=160MM/WL=1064NM	5
4401-350-000-21 Excelitas Technologies	F-THETA-RONAR; F=420MM/WL=1064NM	7
4401-360-000-21 Excelitas Technologies	F-THETA-RONAR; F=330MM/WL=1064NM	6
4401-527-000-21 Excelitas Technologies	F-THETA-RONAR; F=163MM/WL=940-98	5
4401-289-000-20 Excelitas Technologies	F-THETA-RONAR; F=250MM/WL=532NM;	4
4401-461-000-21 Excelitas Technologies	F-THETA-RONAR; TELECENTRIC; ENTR	3

Laser Optics - F-Theta Lenses

1. Overview

F-Theta lenses are specialized optical components designed to maintain a flat focal plane and linear scan speed in laser scanning systems. They correct for field curvature and distortion, ensuring consistent focus across the entire scan area. These lenses are critical in precision manufacturing, medical imaging, and scientific instrumentation where accurate beam positioning and uniform energy distribution are required.

2. Main Types and Functional Classification

Type	Function Features	Application Examples
Flat Field Focusing Lenses	Linear scan speed, flat focal plane	Laser marking, PCB drilling
Telecentric F-Theta Lenses	Minimized angle-dependent errors	High-precision metrology
High NA F-Theta Lenses	Large numerical aperture for small spots	Micro-machining, semiconductor processing
Achromatic F-Theta Lenses	Multi-wavelength correction	Multicolor fluorescence imaging

3. Structure and Components

Typical F-Theta lenses consist of 5-9 optical elements, including: - Front group: Aspherical elements for beam shaping - Middle group: Spherical/cylindrical lenses for aberration correction - Rear group: Field flattening elements - Anti-reflective coatings (e.g., broadband AR for 1064nm/532nm) - Housing materials: Aluminum alloys or stainless steel Advanced designs incorporate diffractive optical elements (DOEs) for chromatic correction.

4. Key Technical Specifications

Parameter	Importance
Focal Length (100-500mm)	Determines scan area size
Wavelength Range	Matches laser source characteristics
Numerical Aperture (0.15-0.5)	Affects spot size and depth of focus
Scan Field ( 20 to 40 )	Defines maximum deflection angle
Distortion (<2%)	Positioning accuracy indicator
Thermal Stability	Ensures consistent performance under power variation

5. Application Fields

Industrial: Laser welding (automotive), 3D printing (metal additive manufacturing)
Medical: Dermatological treatments, OCT imaging systems
Scientific: Confocal microscopy, spectrometry
Electronics: PCB routing, display panel cutting
Case Study: 20W UV laser system with f-theta lens achieves 15 m precision marking on glass substrates

6. Leading Manufacturers

Manufacturer	Representative Product	Key Specifications
Schaefter+Kirchhoff	SK010L-FTH	1064nm, 100mm FL, 25mm aperture
Lumentum	FC-1064-XYZ	1064nm, 160mm FL, <1% distortion
THORLABS	TL100-MF	Multi-coated, 100mm FL, AR coating 350-700nm
Hamamatsu Photonics	C12103	Telecentric design, 20mm scan range

7. Selection Guidelines

Key considerations: - Match wavelength range to laser source (e.g., 1064nm for fiber lasers) - Calculate required focal length: FL = Scan Area / (2 tan _max) - Consider spot size: d = 1.27 FL/( Input Beam Dia) - Environmental factors: Operating temperature (0-80 C typical) - Case Study: For 500mm 500mm scan area with 20W UV laser, select 254mm FL lens with fused silica elements

Industry Trends

Emerging trends include: - Development of achromatic lenses for multi-wavelength systems - Integration of smart coatings with power monitoring capabilities - Miniaturization for portable laser systems (length <100mm) - Increased thermal resistance for high-power ( 1kW) industrial lasers - AI-assisted design optimization reducing aberration to <0.5 m RMS