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Telecom GRIN lenses

In cooperation with IZOVAC Group (Minsk, Belarus) GRINEXT provides various types of

GRIN lenses for telecommunication optics applications – GTC (gradient telecom) lenses.

GTC lenses have low insertion losses (<0.2dB per pair in single-mode fiber collimator system).

GTC lenses are used in different fiber-optic devices: collimators, couplers, isolators and WDM etc

1.We offer

At competitive prices GRINEXT offers
a) GTC preforms with high quality specified refractive index distributions
b) Finished GTC lenses with AR coating.

2.Diameter

GTC lenses diameters are 1.0 mm, 1.8 mm, 3.0 mm  and 4.0mm.

3.Length

1.0 mm -3.0 mm diam GTC lenses are supplied in 0.22P, 0.23P, 0.25P, 0.27P and 0.29P length.
4.0 mm diam GTC lenses are supplied in 0.11P length.

4. GTC preforms

Preforms are supplied in (70 +3/-1) mm length - not less than 11 pcs of 0.23P (1.8mm diam)
finished GTC-type lenses can be made from one preform.

5. General Specifications
Type GTC

Numerical Aperture @0.63mkm

NA(2q ) 0.46
Wavelength, mkm Diameter,mm 1.0 1.8 4.0
0.63 n0 1.61+/-0.009
g,mm-1

0.518

0.339*

0.155
L ** (0.23P),mm

2.79

4.71

4.46 (0.11P)
0.83

n0

1.602+/-0.009

g,mm-1

0.511

0.332*

0.152

L (0.23P),mm

2.83

4.77

4.55 (0.11P)
1.06

n0

1.597+/-0.009

g,mm-1

0.509

0.329*

0.150

L (0.23P),mm

2.84

4.80

4.61 (0.11P)
1.30

n0

1.596+/-0.009

g,mm-1

0.508

0.327*

0.149

L (0.23P),mm

2.84

4.82

4.64 (0.11P)
1.56

n0

1.594+/-0.009

g,mm-1

0.507

0.326*

0.149

L (0.23P),mm

2.84

4.82

4.64 (0.11P)

* ) GTC lenses with parameters g@0.63=0.307mm -1 g@1.56=0.300mm -1 are available.
** )GTC lenses can be designed to optimize length for particular collimator working distances.

6. Mechanical Properties and Defects

 

Specifications

Comment

 

Effective diameter

85% of lens diameter

<0.25 l wave aberration for 0.25P

Diameter tolerance

+0.005/-0.010 mm

 

Ellipticity

4mkm

D max Dmin

 

Index gradient constant

g    tolerance

0.75% Max.

Within a lot (batch) of the same ion exchange procedure (app.2000pcs at 1.8mm diameter)

2.5% Max. Between the lots

Lens length (L)

2.5%

According to g variation

Length tolerance

+0/-0.04mm

Polishing tolerance

Birefringence

<0.05l for 0.25P

Diffusion-stressed state annealed

Maximum length

4.0 P (GTC preform)
0.75P (GTC lens)

Pitch length P=2p/g

End face perpendicularity

20' max

 

Angled end face inclination

00 +/- 10'

20,60 , 80 30'

 

Working temperature

350 oC

Max. temp. for 10 hrs lens function

Humidity resistance

IV group

Avoid moisture in wet atmosph.

Defects

 

Bubbles/Calculi

 

Defects greater than 30mkm are not allowed

Defects smaller than 10mkm are allowed

>3 defects within 10mkm 30mkm are allowed

 

Scratches

 

Scratches greater than 5mkm are not allowed

Scratches smaller than
2mkm are allowed

>3 scratches with 5mkm max width and 200mkm max length are allowed

Edge chips

>3 chips are allowed within the area between 0.9 1.0 of the lens diameter

 

 

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