FOP (Fiber Optic Plates)

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FOP (Fiber Optic Plates)

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Hamamatsu Photonics的FOP（Fiber Optical Plate）的是由微米等級的光纖束集而成的光學器件。FOP如光學透鏡一般高效率且低失真的傳遞光及影像。不同於一般的光學透鏡，FOP不需對焦，所以FOP在設計和建造精巧的光學器件時是非常理想的元件。

Hamamatsu Photonics FOP is an optical device comprised of a bundle of micron-sized optical fibers. The FOP is used as a lens to convey the light and image

Fiber Optic Plates
The FOP (fiber optic plate) is an optical device comprised of a bun- dle of micron-diameter optical fibers. The FOP directly conveys light or image incident on its input surface to its output surface.

FEATURES
◆No focusing distance required allows simple and compact optical design
◆Superb X-ray shielding ability
(X-ray shielding type)
◆Image magnification and reduction
(tapered fiber optics)
◆Customized products available
◆All products RoHS compliant

CONSTRUCTION
The basic element of an FOP consists of a single fiber that conveys light and an absorb- er glass that absorbs light leaking from the fiber.
In each single fiber, light is conveyed by total reflection that occurs at the boundary be- tween the core glass and the cladding glass due to the difference in their refractive index. As shown in the figure on the right, when light (shown by broken line) enters a fiber at an angle  (theta) greater than the maxi- mum acceptance angle 1, it does not totally reflect and exits the fiber. However, that light is absorbed by the absorber glass so that it will not reach the next fibers. This feature allows optical images to transmit through each fiber without degrading the resolution.

Allows compact optical design with high resolution

An FOP can be directly coupled to solid state imaging devices such as CCD and CMOS image sensors. Unlike a normal optical lens, FOP requires no space for focusing distance and so allows a flexible compact optical design.

Effective for X-ray shielding

The X-ray shielding type FOP has a shielding capability about 5 times higher than a standard FOP when ex- posed to X-rays emitted from a 70 kV X-ray tube (comparison made us- ing a 3 mm thick FOP). When an FOP is used as the light-receiving surface of a camera, it prevents the image sensor in the camera from de- teriorating due to exposure to X-rays.

Low-NA-FOP

Hamamatsu also provides FOP with a low NA (numerical aperture). In this type of FOP, light incident at an angle exceeding the maximum acceptance angle is absorbed by the absorber material. So this FOP is ideal when extracting only light having a small incident angle.

Tapered fiber optics for image magnification or reduction

These are tapered FOPs fabricated by heat treatment to have a different size ratio be- tween their input and output surfaces. This magnifies or reduces the input image at the desired ratio. The magnification/reduction ra- tio for a standard tapered FOP is 1:2 or 2:3 but can be varied up to a maximum of 1:5.

Fiber Optic Plates

SPECIFICATIONS

Item		Fiber optic plate					Tapered fiber optics	Unit
Type No.		J3182	J11181	J11057	J12221	J5734	J5743	Unit
FOP type		Standard	Standard	X-ray shielding	Low-NA	High resolution	Taper (Ratio 2:1)	—
Numerical aperture (N.A.)		1.0			0.43	1.0	1.0	—
Maximum acceptance angle (full angle)		180			51	180	180	deg.
Fiber diameter		6			25	3	6 (large end)	mm
Resolution *1		102			28.5	161	102	Lp/mm
Transmittance*2	Collimated light	73	73	70	45	79	63	%
Transmittance*2	Diffused light	63	63	66	6	60	15	%
Coefficient of thermal expansion *3		85	84	77	93	85	84	x10^-7/°C
Absorber		Yes						—

*1: Test target USAF1951 (reference values)
*2: at 550 nm wavelength
*3: at 100 C to 300 C

OUTSIDE DIMENSIONS

Type No.	Suffix	Shape (mm)
J3182 J11057 J12221	-72	30.0 x 20.0 x 3.0 t
	-73	50.0 x 50.0 x 3.0 t
	-74	φ26.5 x 3.0 t
J11057 / J11181	-75	100.0 x 100.0 x 3.0 t
J5734	—	13.59 x 6.86 x 2.54 t
J5743	—	φ12.5 - φ25.0 x 25.0 t

檔案下載

FOP (Fiber Optical Plate) Catalog