FA1000S_FP is a device to couple a Laser beam (TEM00) which
propagates in free space into an optical fiber (in LP01 mode) throughthe aspheric lens, providing ultra-high coupling efficiency.
FA1000S_FP has been developed by FMD with full cooperation ofProfessor Akira Furusawa of the University of Tokyo.
98% coupling efficiency was achieved by his lab, using the setup forevaluation outlined in Fig. 1 at the time of Jan, 2013.
Coupling efficiency [%]=
Photodetector(Reference)

Photodetector(Input)PD1PD2i =PD20×PD10PD2PD2i×100

Fiber AlignerFA1000S_FP

TEM 00 Beam Source

PD1PD2PD2i
PD10・PD20

Aspherical Lens
(AR coated)

FA1000S_θ

Optical Fiber(AR coated)

Photodetector(output)

Fig.1 Outline of the Setup for Evaluation

98% coupling efficiency with optical fiber was achieved.

Sphere Gimbal Mechanism - FA1000S_θ
FA1000S_θ employs Sphere Gimbal Mechanism which is jointly
patented by FMD and Professor Akira Furusawa of the University ofTokyo (Patent No. 5888775, JP). This mechanism enables the centerof the end surface of an optical fiber to meet the intersection of two
mutually perpendicular rotational axes θx and θy. Therefore, it makes
hassle-free to adjust alignment which used to be time and laborconsuming. After making adjustment using with ultra-precisionadjusting screws with almost no backlash of which performance has
been proved with MM1000S mirror mounts, unparalleled long-term
stability can be retained by Soft Lock Mechanism (Patent applicationNo. 2005-352867, JP).
Incident Point
Sphere Gimbal Mechanism

FA1000S_θ(Center of Sphere
Rotating Element)

θx Drive Barθz

Aspherical Lens

Optical Fiber

HousingLens Holder
Dust seal
Sphere Rotating ElementInternal Structure of Sphere Gimbal Mechanism

θx
Fiber Adapter

Fig.2 Sphere Gimbal Mechanism

FA1000S_FP with FMD made fine pitch adjusters
Accessories

Special Wrench: SCR-ADJ
A specialized tool to make fine adjustment tothe precision screws made by FMD

FA1000S_FP equips FMD made ultra-precision adjusting screws. See the image
on the left-hand side of the previous page. FA1000S_FP makes it possible tocouple an optical fiber and a laser with ultra-high efficiency with relatively easy
operation. The height of the optical axis is designed to 2 inches. When you
need to change the height, you can adjust it by mounting the four posts underthe base plate. The knob with a φ12 hole enables additional fine adjustments
without difficulties, by using with a special wrench SCR-ADJ which comes with.
SPW302_MOD is a wrench designed to attach/detach lens. A special Iris
ID15/M_Hm25Tm6 to make fine adjustment of light axis comes with, whichenables to adjust the height of a light axis and a pinhole (PH016) in 2 inches
high to guide an incident light to the center of the lens.

Adjusting X axis
(Aspherical Lens)

75

168

50

16.5

21.5

12650

X axis(Lens)

Y axis(Lens)

50

Special Wrench: SPW302_MOD
A specialized tool for attaching and removing
the aspherical lens.

*1 Lens HolderθzAdjusting Y axis
(Aspherical Lens)

Reference Line
3-M6×16 Cap Screw(φ6×φ12×1t with a washer)

Adjusting Z axis
(Aspherical Lens)

Adjusting θy axis

X axis(Fiber)Adjusting X axis
(Optical Fiber)

FA1000Sθ

Adjusting θx axis

θxZ axis(Lens)

Z axis(Fiber)50.8(2inch)

107(Nominal)

Adjusting Z axis
(Optical Fiber)

13(Nominal)

Special iris: ID15/M_Hi2Tm6

A specially designed tool for adjusting incident
light into 2 inch high parallel light against an
optical breadboard. Two pieces come with.
ID15/M_Hi2Ti1/4 is for an optical breadboard
with inch screws(1/4”-20). Please specify whenordering.

Pinhole: PH016
A tool designed to guide an incident light into thecenter of the lens holder.

Reference LineFig. 3 FA1000S_FP Drawings
Dimensions

168 mm (W) x 126 mm (D) x 107 mm (H)(except knobs and fiber)

WeightApprox. 3.6 kg

Mounting method

M6 x 12 CAP screw, Φ6 x Φ12 x 1 (t) washers

Fiber adapter

FC/APC or FC/PCLens

M12 x 0.5 male thread type aspheric lens(Contact us for details.)

Working distance

2.8 mm - 9.5 mm (between lens and fiber)

Tilt Range±5° (θx, θy)Angular resolution
θxθyWhen the knob is turned 1 degrees
0.0017° (18.9 μrad)0.0015° (21.4 μrad)

Remarks

FMD made ultra-fine adjusting screws with 0.15mm pitch are used. The screws
have been used in FMD’s ultra-stable mirror mount MM1000S to prove almost
no backlash and hysteresis for long time.
FA1000S_DM with a micrometer for less fine adjusting than FA1000S_FP isavailable upon your request. Contact us for details.