LBTEK-Multi-Focus Lens

Product Description

Liquid Crystal Polymer / N-BK7 Window Material with Single-Layer Substrate Structure
Generates Multiple Focal Spots of Equal Intensity with Configurable Focal Spacing
Incident Beam Size Must Match the Clear Aperture
Operating Wavelengths: 532 nm and 633 nm Available; Number of Focal Points: 5; Focal Spacing: 50 mm
Supports Flexible Customization of Specifications

LBTEK Multi-Focus Lens is a diffractive optical element that is sensitive to the polarization state of incident light. A circular polarizer is typically placed in front of the lens. When circularly polarized light is used as the input, the laser beam passes through different regions of the multi-focus lens and forms multiple focal spots of equal energy along the propagation direction. When used in combination with a focusing lens, the multi-focus lens allows adjustable focal spacing, providing greater flexibility in propagation distance. LBTEK can precisely design the phase distribution of the multi-focus lens based on the divergence angle, size, and energy distribution of the incident beam. Sub-micron-level liquid crystal polymer microstructure arrangement suppresses the zero-order diffraction efficiency to below 4%. LBTEK offers standard 1-inch multi-focus lenses with selectable operating wavelengths of 532 nm and 633 nm, 5 focal points, and 50 mm focal spacing, and also supports flexible customization of specifications. Please contact LBTEK Technical Support for details.

Diagram

Attributes

MaterialLiquid Crystal Polymer/N-BK7 Window

Focal length50-250 mm（Δ=50 mm）

Optical component sizeØ25.4 × 1.6 mm

Number of focal lengths5

Clear ApertureØ20.0 mm

Diffraction efficiency> 96%

Surface Quality (Scratch/Dig)60/40

AR CoatingRavg < 0.5% @ 400 nm–700 nm

Multi-Focus Lens

Substrate Material: Liquid Crystal Polymer/N-BK7 Window
Operating Wavelengths: 532 nm, 633 nm
Number of Focal Points: 5
Focal Length: 50–250 mm (Δ = 50 mm)

LBTEK Multi-Focus Lenses are fabricated on N-BK7 windows with a single-layer substrate structure. One side of the window is coated with a liquid crystal polymer film exhibiting uniform phase retardance across the entire clear aperture, equal to 1/2 of the operating wavelength; the other side is coated with an AR coating, and light should be incident from the AR-coated side. To ensure equal energy at each focal point, the incident beam size must match the clear aperture of the multi-focus lens. LBTEK can customize multi-focus lenses based on liquid crystal polymer with specific wavelengths, focal lengths, numbers of focal points, and dimensions. Important notes: ● This product uses a single-layer protective substrate. Please distinguish between the AR-coated side (i.e., the incident surface) and the liquid crystal polymer side — the side pointed to by the tip of the "V" mark is the liquid crystal polymer side. ● Avoid any form of physical contact with the liquid crystal polymer side, including scratching or rubbing. ● Never use alcohol, water, acetone, or similar solvents to wipe the liquid crystal polymer side. If cleaning is required, prefer non-contact methods such as compressed air.

Multi-Focus Lens Structure Under a Polarizing Microscope

	Product Model	Operating Wavelength	Focal length	Clear Aperture	File	Unit Price	Compare	Lead Time
	PBMFL25-532-05	532 nm	50–250 mm（Δ=50 mm）	Ø20.0 mm		$1,600.27		today	Add Cart
	PBMFL25-633-05	633 nm	50–250 mm（Δ=50 mm）	Ø20.0 mm		$1,600.27		4 weeks	Add Cart