光ファイバーテーパー（FOT）

The fiber size on large end of the taper

• Typical Value: 6.0um / 10.0um
• Min Value: 4.0um
• Max Value: 15.0um

*Note: The fiber diameter is different on big end and small end.

The fiber size on the small end of the taper.

*Note: This is a dependency value, which related to Magnification ratio and Large End Fiber Diameter

• Typical Value: ≥2.5um
• Min Value: 2um
• Max Value: NA

Key Parameter of Fiber Optic Taper. Defines the Magnifying power of the component.

• Typical Value: 1.5x-3x
• High Value: 3.1x- 7.0x

*Note:

• Higher magnification ratio may reduce the light transmission further.
• FOT with 3X magnification usually needs customization.

The geometric of Large end and Small end of the Fiber Optic Taper.

Typical Shapes:

• Round to Round
• Square to Square

Availablility: Square, Round, Step, Concave

The numerical aperture (NA) for fiber is a measure of the range of angles within which light that is incident on the fiber will be transmitted along it.

• Theorical Value: 1
• Practical Value: 0.65 - 0.85

*Note:The numerical aperture here is referred to N.A on small end.

The resolution here is expressd in the terms of lp/mm.

Typical Value:

• 50lp/mm (10um)
• 102lp/mm (6um)
• 166lp/mm (3um)
• 230lp/mm(2um)

*Note:Testing with USAF1951, all results are under theoretical testing condition.

"lp/mm" is a pair of black and white squares in object space, which are the smallest elements that can be distinguished by the system.

• Thermal Expansion Coeff.
  (20-300°)
  = (60-90) x 10**(-7) / °C
• Vacumm Tightness
  < 10 - 12Pa · m3/s
• Transmission (Collimated Light)
  Approx 75 ~ 85%
• Wavelength Range
  400nm ~ 1400nm
• Interestital Fibers (EMA)
  Yes
• XRAY Absorption
  Yes

*Note:EMA are used to absorb the stray light inside the fiber optic taper.

Below are typical quality metrics for Fiber optic taper, final products may vary depends on the setup.

• Surface Quality: 40-20
• Surface Accuracy: 2λ (P-V)
• Max Shear Distortion: <40um
• Max Gross Distrotion: <65um
• Max Image Shift: <180um
• Max Barrel Distrtion: <3%
• Max Blemishes: < 90um
• Clear Aperture: 90% - 95%

• Taper Height: Minimum Taper Height can be made to 0.8-1.0x of the Large End Taper Diameter

For example, a taper with large end diameter of 30mm will have a height around 24~30mm.

*Note:This is not a definite value, could vary depending on the tapering process

These are the independent specifications you can change freely when customizing a Taper.

• Surface Size
• Shape
• Large End Fiber Diameter
• Magnification Ratio

Below are dependency specifications of the fiber optic taper. (Related to other properties, can't be changed independently)

• Small End Fiber Diameter
• Resolution
• N.A (Inherit from material)
• Transmission

• Bigger surface will cost more than smaller surface. A surface diameter less than 50mm is good for saving the cost.
• Transmission is inherit from the material property and also related to the taper height.
• If you haven't use the Fiber Optic Taper before, consider to buy a stock unit from us to understand its performance better.