N-BK7 & Fused Silica Double Concave Lens

Double Concave Lens

Crysmit have more than 10 years of experience in lens manufacturing, design, and optical precision assembly. CRYSMIT provide Double Concave Lenses with the material of N-BK7, fused silica, sapphire, CaF2, and other glass raw material.
A Double Concave Lens, or Biconcave Lens, has two inwardly curved surfaces. It diverges light, forming virtual images that appear on the same side as the light source. This lens type has a negative focal length, indicating it spreads light rather than focusing it. It can also reduce the spherical aberration caused by other lenses. They are essential components in many optical systems, found in a wide range of optical equipment.

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N-BK7 Spherical Lenses

UVFS Spherical Lenses

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Part NO.

Material

Construction

Diameter

Thickness

Flatness

EFFL(587.6nm)

Coated

Delivery

Price

Add to CART

Part NO.	Material	Construction	Diameter	Thickness	Flatness	EFFL(587.6nm)	Coated	Delivery	Price	Add to CART
UV Fused Silica DCV Spherical Lenses B01	N-BK7	Double-Concave	12.7 mm	3.2 mm	λ/8	-12.7 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B02	N-BK7	Double-Concave	12.7 mm	2.2 mm	λ/8	-25 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B03	N-BK7	Double-Concave	12.7 mm	2.4 mm	λ/8	-40 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B04	N-BK7	Double-Concave	12.7 mm	2.6 mm	λ/8	-50 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B05	N-BK7	Double-Concave	12.7 mm	2.6 mm	λ/8	-60 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B06	N-BK7	Double-Concave	12.7 mm	2.7 mm	λ/8	-75 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B07	N-BK7	Double-Concave	12.7 mm	2.8 mm	λ/8	-100 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B08	N-BK7	Double-Concave	12.7 mm	1.7 mm	λ/8	-125 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B09	N-BK7	Double-Concave	12.7 mm	1.8 mm	λ/8	-150 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B10	N-BK7	Double-Concave	12.7 mm	1.8 mm	λ/8	-200 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B11	N-BK7	Double-Concave	12.7 mm	1.8 mm	λ/8	-250 mm	Uncoated	1 weeks	$20
UV Fused Silica DCV Spherical Lenses B12	N-BK7	Double-Concave	25.4 mm	4.8 mm	λ/8	-25 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B13	N-BK7	Double-Concave	25.4 mm	2.7 mm	λ/8	-40 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B14	N-BK7	Double-Concave	25.4 mm	4.5 mm	λ/8	-50 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B15	N-BK7	Double-Concave	25.4 mm	2.6 mm	λ/8	-60 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B16	N-BK7	Double-Concave	25.4 mm	3.7 mm	λ/8	-75 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B17	N-BK7	Double-Concave	25.4 mm	3.2 mm	λ/8	-100 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B18	N-BK7	Double-Concave	25.4 mm	3.1 mm	λ/8	-125 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B19	N-BK7	Double-Concave	25.4 mm	3 mm	λ/8	-150 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B20	N-BK7	Double-Concave	25.4 mm	2.8 mm	λ/8	-200 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B21	N-BK7	Double-Concave	25.4 mm	2.9 mm	λ/8	-250 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B22	N-BK7	Double-Concave	25.4 mm	3.2 mm	λ/8	-400 mm	Uncoated	1 weeks	$30
UV Fused Silica DCV Spherical Lenses B23	N-BK7	Double-Concave	25.4 mm	3.2mm	λ/8	-500 mm	Uncoated	1 weeks	$30

Part NO.

Material

Construction

Diameter

Thickness

Flatness

EFFL(587.6nm)

Coated

Delivery

Price

Add to CART

Part NO.	Material	Construction	Diameter	Thickness	Flatness	EFFL(587.6nm)	Coated	Delivery	Price	Add to CART
UVFS Cylindrical Lenses X01	UV Fused Silica	Plano-Convex	12.7 mm	12.7 mm	4.9 mm	λ/8	15 mm	Uncoated	$40
UVFS Cylindrical Lenses X02	UV Fused Silica	Plano-Convex	19.1 mm	25.4 mm	8 mm	λ/8	25 mm	Uncoated	$45
UVFS Cylindrical Lenses X03	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	10 mm	λ/8	30 mm	Uncoated	$45
UVFS Cylindrical Lenses X04	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	8 mm	λ/8	40 mm	Uncoated	$45
UVFS Cylindrical Lenses X05	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	7.1 mm	λ/8	50 mm	Uncoated	$45
UVFS Cylindrical Lenses X06	UV Fused Silica	Plano-Convex	25.4 mm	50.8 mm	7.1 mm	λ/8	50 mm	Uncoated	$50
UVFS Cylindrical Lenses X07	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	5.6 mm	λ/8	75 mm	Uncoated	$45
UVFS Cylindrical Lenses X08	UV Fused Silica	Plano-Convex	25.4 mm	50.8 mm	5.6 mm	λ/8	75 mm	Uncoated	$50
UVFS Cylindrical Lenses X09	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	4.7 mm	λ/8	100 mm	Uncoated	$45
UVFS Cylindrical Lenses X10	UV Fused Silica	Plano-Convex	25.4 mm	50.8 mm	4.7 mm	λ/8	100 mm	Uncoated	$50
UVFS Cylindrical Lenses X11	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	4.4 mm	λ/8	125 mm	Uncoated	$45
UVFS Cylindrical Lenses X12	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	4.1 mm	λ/8	150 mm	Uncoated	$45
UVFS Cylindrical Lenses X13	UV Fused Silica	Plano-Convex	25.4 mm	50.8 mm	4.1 mm	λ/8	150 mm	Uncoated	$50
UVFS Cylindrical Lenses X14	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	4.3 mm	λ/8	200 mm	Uncoated	$45
UVFS Cylindrical Lenses X15	UV Fused Silica	Plano-Convex	25.4 mm	50.8 mm	4.3 mm	λ/8	200 mm	Uncoated	$50
UVFS Cylindrical Lenses X16	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	4.2 mm	λ/8	250 mm	Uncoated	$45
UVFS Cylindrical Lenses X17	UV Fused Silica	Plano-Convex	25.4 mm	50.8 mm	4.2 mm	λ/8	250 mm	Uncoated	$50
UVFS Cylindrical Lenses X18	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	4.1 mm	λ/8	300 mm	Uncoated	$45
UVFS Cylindrical Lenses X19	UV Fused Silica	Plano-Convex	25.4 mm	50.8 mm	4.1 mm	λ/8	300 mm	Uncoated	$50
UVFS Cylindrical Lenses X20	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	3.8 mm	λ/8	500 mm	Uncoated	$45
UVFS Cylindrical Lenses X21	UV Fused Silica	Plano-Convex	25.4 mm	50.8 mm	3.8 mm	λ/8	500 mm	Uncoated	$50
UVFS Cylindrical Lenses X22	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	2.5 mm	λ/8	1000 mm	Uncoated	$45
UVFS Cylindrical Lenses X23	UV Fused Silica	Plano-Convex	25.4 mm	50.8 mm	2.5 mm	λ/8	1000 mm	Uncoated	$50
UVFS Cylindrical Lenses X24	UV Fused Silica	Plano-Convex	25.4 mm	25.4 mm	2.2 mm	λ/8	1500 mm	Uncoated	$45
UVFS Cylindrical Lenses X25	UV Fused Silica	Plano-Convex	25.4 mm	50.8 mm	2.2 mm	λ/8	1500 mm	Uncoated	$50

Know about the features and application of Double Concave Lens ?

A Double Concave Lens, also known as a Biconcave Lens, is a lens that has two inwardly curved, concave surfaces. Here are the key features of a double concave lens:

Diverging Light: Double Concave Lenses are designed to diverge light, spreading out parallel light rays. This makes them useful in a variety of applications where light needs to be diverged, such as beam expanders.

Forming Virtual Images: Unlike double convex lenses, which form real images, double concave lenses form virtual images that appear to be located on the same side of the lens as the light source. This is useful in devices like peepholes and optical character recognition (OCR) systems.

Negative Focal Length: Double Concave Lenses have a negative focal length, which means they cause light to diverge rather than focus.

Reduction of Spherical Aberration: When used appropriately, a double concave lens can be used to reduce the spherical aberration produced by other lenses.

Material Variety: Double Concave Lenses can be made from a wide range of materials, including N-BK7, Fused Silica, and various types of plastic. The choice of material can significantly affect the properties of the lens, such as its transmission range, resistance to physical and chemical damage, and its refractive index.

In summary, double concave lenses are an essential component in many optical systems due to their ability to diverge light and form virtual images. They're found in a variety of optical equipment, from simple viewing devices to more advanced optical systems.

Attribute	Specification
Material	N-BK7, Fused Silica, N-SF10, Silicon, CaF2, Sapphire, etc.
Typical Diameter (Фmm)	10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 50.8, etc.
Diameter Tolerance (mm)	+0.0/-0.02 (High Precision)
Paraxial Focal Length Tolerance (mm)	±2%
Centration	<3 arc min
Clear Aperture	>90%
Surface Figure (@632.8nm)	λ/4 (High Precision)
IRR ( @632.8nm)	λ/10 (High Precision)
Surface Quality	10/5 (High Precision)
Bevel (face width x 45°)	<0.25mm
Coating	uncoated, AR, HR, PR Coating, etc.