Plano-Concave Axicon Lenses for Laser Beam Shaping & Ring Beam Generation

Description

Plano-concave axicon lenses are specialized conical optical elements used for laser beam shaping, annular beam generation, and Bessel-like beam formation in advanced photonics and laser processing systems. Unlike conventional spherical optics, plano-concave axicons transform incoming Gaussian beams into ring-shaped or extended-focus beam profiles with unique propagation characteristics.

These precision conical lenses are widely used in ultrafast laser processing, microscopy, optical coherence tomography (OCT), optical trapping, beam homogenization, and scientific imaging applications requiring controlled energy distribution and extended depth of focus.

Plano-concave axicon optics are particularly valuable in laser micromachining and beam transformation systems where elongated focal regions, annular illumination patterns, or non-diffracting beam behavior improve processing precision and optical performance.

Discover the precision and quality of the Axicon Lens crafted by China & South Optical Crystal (CSOC), a pioneering manufacturer in the optical industry and the first producer of optical glass products in Hong Kong. Established in 1972, CSOC marked a milestone in Hong Kong’s optical manufacturing history by becoming the first factory dedicated to the production of watch glasses, later expanding into a comprehensive manufacturer of high-precision optical components and sapphire products.

Through decades of continuous innovation and development, CSOC has expanded beyond Hong Kong and established advanced production facilities in Shenzhen and beyond.

Engineered with high precision, CSOC’s Axicon Lens features outstanding surface quality, excellent flatness, and precise angular control, delivering superior optical performance with minimal distortion. Advanced coating options including AR and BBAR coatings are available to enhance light transmission and reduce reflection, making the lens an ideal solution for professional optical systems requiring accuracy and stability.

How Plano-Concave Axicons Transform Laser Beams

Plano-concave axicons use a conical optical surface to redistribute incoming laser energy into annular or extended-focus beam profiles. By modifying the propagation geometry of the beam, these optics can generate ring-shaped illumination patterns and Bessel-like beams with reduced diffraction over longer distances.

This optical behavior enables improved depth of focus, more uniform energy distribution, and enhanced beam control in laser processing, microscopy, and imaging applications.

Advantages of Plano-Concave Axicon Optics

Plano-concave axicon optics provide several advantages in laser beam shaping and advanced photonics applications, including extended focal regions, annular beam generation, reduced diffraction, and improved beam uniformity.

These characteristics make them highly effective for ultrafast laser systems, laser drilling, optical alignment, and precision material processing applications requiring controlled energy distribution and stable beam propagation.

Specifications

Material:	BK7, FS, UVFS, Sapphire, B270
Axicon Type:	Plano-Convex, Plano-Concave, Bi-Convex, Bi-Concave
Diameter Range:	Not Specified
Max Apex Angle (alpha):	Not Specified
Diameter:	5-150mm
Apex Rounding Diameter:	<1 mm
Diameter Tolerance:	mm+0.0/-0.15
Clear Aperture:	>90%
Surface Quality (S-D):	60-40
Apex Angle Tolerance:	±0.1°. Available down to +/-0.005°
Flatness:	λ/4
Thickness Tolerance (mm):	±0.1
Protective Chamfers:	<0.25 mm x 45 deg
Coatings:	Available on request
Material:	Sapphire, BK7, B270, Quartz
Axicon Angle:	Max 179.5deg

Got questions about specs? Use the inquiry form to ask.

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Features

Plano-Concave Axicons (Conical Lenses)

Material:Sapphire, BK7, B270, Quartz
Diameter: 5-150mm
Axicon Angle: Max 179.5deg
Apex Rounding Diameter: <1 mm
Diameter Tolerance: mm+0.0/-0.15
Clear Aperture: >90%
Surface Quality (S-D):60-40
Apex Angle Tolerance: ±0.1°. Available down to +/-0.005°
Flatness: λ/4
Thickness Tolerance (mm):±0.1
Protective chamfers:<0.25 mm x 45 deg
Coatings Available on request

Applications

Plano-concave axicon lenses are widely used in laser beam shaping, optical metrology, microscopy, ultrafast laser processing, OCT imaging, beam homogenization, and scientific research applications.

Their ability to generate annular and Bessel-like beam profiles makes them useful for laser drilling, laser micromachining, particle trapping, semiconductor processing, and imaging systems requiring extended depth of focus or ring-shaped illumination patterns.

Laser Beam Shaping: Designed to convert Gaussian laser beams into non-diffractive ring-shaped beams, making it ideal for applications requiring precise and uniform energy distribution.
Optical Metrology: Widely used in high-precision measurement and alignment systems where exceptional optical accuracy and stability are essential.
Medical Imaging: Applied in advanced imaging technologies such as Optical Coherence Tomography (OCT), improving depth resolution and imaging performance in medical diagnostics.
Microscopy: Enhances optical imaging capabilities in microscopy applications, providing improved visualization for biological research and materials science analysis.
Optical Trapping: Utilized in optical tweezers systems for the precise manipulation of microscopic particles and biological specimens using focused light beams.

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Frequently Asked Questions

What is a plano-concave lens?

A plano-concave axicon is a conical optical element designed to transform a laser beam into an annular, ring-shaped, or Bessel-like beam profile. Unlike traditional spherical lenses, which focus light to a single point, the plano-concave axicon redistributes light over an extended focal region through its unique propagation characteristics. These optical components are frequently employed in laser beam shaping, optical metrology, ultrafast laser systems, microscopy, and advanced photonics applications requiring controlled energy distribution and extended depth of focus.

How does a plano-concave axicon work?

The plano-concave axicon utilizes the geometry of its conical surface to refract incident light, generating an annular or Bessel-like beam that forms a continuous interference pattern. Rather than converging light rays to a single focal point, the lens creates an elongated focal region or an annular intensity distribution. This optical behavior results in an increased depth of focus and reduced diffraction, rendering the plano-concave axicon highly useful in applications involving beam shaping, laser processing, and scientific imaging.

What is the difference between a standard shaft cone and a concave shaft cone?

Standard axicons and plano-concave axicons are both conical optical elements used for beam shaping; however, they differ in their geometry and optical behavior. Plano-concave axicons typically feature one flat surface and one inner conical surface, thereby enabling specific beam transformation characteristics—such as the generation of annular beams and the modification of focal distributions. They are commonly selected for applications requiring precise control over annular or Bessel-like beam profiles.

What is a plano-concave cylindrical lens used for?

Plano-concave axicon lenses are utilized in laser beam shaping, ultrafast laser processing, optical coherence tomography (OCT), microscopy, beam homogenization, optical trapping, and scientific research systems. Their ability to generate annular and extended-focus beams renders them invaluable in laser drilling, semiconductor processing, precision micromachining, biomedical imaging, and applications requiring non-diffracting or annular beam propagation.

Can a plano-concave axicon generate a Bessel beam?

Yes, a plano-concave axicon can generate a Bessel-like beam by transforming a Gaussian laser beam into an elongated focal region with reduced diffraction. Bessel beams are widely utilized in laser micromachining, microscopy, optical trapping, and imaging systems, as they maintain their beam intensity over a longer propagation distance compared to traditional focused beams.

Is a plano-concave axicon compatible with ultrafast lasers?

Yes, plano-concave axicons are frequently utilized in ultrafast laser systems, including femtosecond and picosecond lasers. Their beam-shaping capabilities are particularly valuable in applications involving ultrafast laser micromachining and precision materials processing. For ultrafast laser applications, axicons are typically fabricated using high-quality optical materials and specialized coatings to ensure a high laser-induced damage threshold and minimize dispersion effects.

What materials and coatings are available for concave axicon optics?

Plano-concave axicons are fabricated using a variety of optical materials—including fused silica, BK7, sapphire, and infrared-transmitting materials—depending on the specific wavelength and application requirements. They can also be equipped with anti-reflection coatings optimized for the UV, visible, near-infrared, or infrared spectral bands to enhance transmission efficiency and minimize optical losses in laser and imaging systems.

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