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Free Space Isolators

CASTECH's Free Space Isolators could maintain the light's linear polarization, through rotating the plane of polarized light 45°in the forward direction and an additional 45°of non-reciprocal rotation in the reverse direction. CASTECH free space isolator series include 2 types :Polarization and Polarization Indepent. Meanwhile, free space isolators include fixed wavelength isolators and wavelength adjustable isolators.


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     CASTECH's  Free Space Isolators could maintain the light's linear polarization, through rotating the plane of polarized light 45°in the forward direction and an additional 45°of non-reciprocal rotation in the reverse direction. CASTECH free space isolator series include 2 types :Polarization and Polarization Indepent. Meanwhile, free space isolators include fixed wavelength isolators and wavelength adjustable isolators. 

 

Features:

High damage threshold and power handling

Peak Isolation : Range from 30dB to 45dB

Free space input and output

Orthogonal isolated beams

Isolators are available for optional λ/2 plate

All isolators contain escape ports


Applications:

Maintain the light's linear polarizaton

Avoide deleterious effects of back reflectons in laser diodes

Eliminate instability in amplified laser systems caused by ASE

Reduce Nd and Yb oscillations from ASE created by amplifiers


Specifications:

VIS

NIR

IR

Center Wavelength

405,532,561,632,650,780,808,850,980nm

1030,1064nm

1319,2000,4500nm

Operating Wavelength Range

±10nm

±15nm

±10nm

Peak Transmission

>90%

>92%

>90%

Peak Isolation

>35dB

>30dB

>35dB

M2 Degradation

<10%

<10%

<10%

Clear Aperture

3,4mmorothers

2,3,4,5,8,10,12orothers

3,4mm orothers

OpticalPower(Average)

10,30,50WorSpecify

10,30,50,100WorSpecify

10,30,50WorSpecify

Damage Threshold

3.5J/cm2@ 10ns

10J/cm2@ 10ns

5J/cm2@ 10ns

Storage Temperature Range

-20-70℃

Tunable Temperature Range

10-30℃

Product specifications are subject to change without notice;

Customized (Wavelength, Dimension, Power Handling , etc) are available;

Note:All products are RoHS compliant.

 

Dimensions (Unit: mm):

VIS(common type):


 

Wavelength

A

B

  C

D

E

F

G

H

532nm

23

34.5

35

19

48

11

Φ27

Φ20

561nm

23

34.5

35

19

48

11

Φ27

Φ20

650nm

29

32.3

76.2

19

 56.4

25.4

Φ27

Φ18

780nm

29

32.3

76.2

19

 62.5

25.4

Φ27

Φ18

850nm

31.7

37.1

76.2

  21.3

 66.5

25.4

Φ27

Φ18

980nm

38.1

37.1

76.2

  24.4

 70.4

25.4

Φ31.8

Φ18

VIS(adjustable broadband):

NIR(common type):

Aperture=2~5mm                                                                                  Aperture=8/10mm

   

 

Aperture=12mm

 

NIR(Dual Stage type):

 

IR:

Wavelength at 1319nm                                                                              Other wavelength

 

 

Polarization Independent:

Default  size:                                                                                    Aperture=1.5mm

            

 

 

Device

Type

Power Handling (W)

Apeture Size (mm)

Wavelength (nm)

Isolator

Common Type

10

30

50

100

2

3

4

5

8

10

12

other

532-980

1030

1064

1319

2000

4500

Example: Model Number HPISO-FS-30-3-532 described 3mm aperture isolator centred at 532nm, handling power is 30W.

 

Device

Type

Power Handling (W)

Apeture Size (mm)

Wavelength (nm)

Isolator

Adjustable

Broadband

30

50

100

6

8

10

other

550-750

other

Example: Model Number HPISO-AB-100-5-550-750 described a 5mm aperture isolator which can be used over a  specified tuning range of 550 to 750nm, handling power is 100W.

 

Device

Type

Power Handling (W)

Apeture Size (mm)

Wavelength (nm)

Isolator

Dual Stage

10

30

50

3

4

5

other

1030

1064

Example: Model Number HPISO-DS-30-3-1064 described 3mm aperture isolator centred at 1064nm, handling power is 30W.

 

Device

Type

Power Handling (W)

Apeture Size (mm)

Wavelength (nm)

Isolator

Polarization Independent

5

10

30

50

1.5

3

4

5

other

980

1030

1064

Example: Model Number HPISO-PI-30-3-1064 described polarization independent isolator handling power is 30W, which  aperture is 3mm, centred at 1064nm.

 

1.Introduction

The main component of the optical isolator is the Faraday rotator. The magnetic field B, applied to the Faraday rotator causes a rotation in the polarization of the light due to the Faraday effect. The angle of rotation θ is given by θ=vBL, where v is the Verdet constant of the magneto-optic material, and L is the length of the magneto-optic material. Specifically for an optical isolator, the values are chosen to give a rotation of 45°.

2.Faraday Rotator

Faraday rotator is an important optical element in an isolator. The characteristics of a Faraday rotator include a high Verdet constant, low absorption coefficient, low non-linear refractive index and high damage threshold. The two most commonly used materials for the 700–1100 nm range are terbium doped borosilicate glass and terbium gallium garnet crystal (TGG). For  infrared wavelength range, typically for the 1300-4000nm, yttrium iron garnet crystals are used (YIG).

 

Faraday rotator provides non-reciprocal rotation while maintaining linear polarization. That is, the polarization rotation due to the Faraday rotator is always in the same relative direction. So in the forward direction, the rotation is positive 45°. In the reverse direction, the rotation is −45°. This is due to the change in the relative magnetic field direction, positive one way, negative the other. This then adds to a total of 90° when the light travels in the forward direction and then the negative direction. This allows the higher isolation to be achieved.

3.Optical Isolator

Optical isolator according to its physical principles can be divided into polarization dependent isolator and polarization independent isolator.The polarization dependent isolator, or Faraday isolator, is made of three parts, an input polarizer (polarized vertically), a Faraday rotator, and an output polarizer, called an analyser (polarized at 45°).

 

Polarization dependent isolators are typically used in free space optical systems. This is because the polarization of the source is typically maintained by the system. In optical fibre systems, the polarization direction is typically dispersed in non polarization maintaining systems. Hence the angle of polarization will lead to a loss.

The polarization independent isolator is made of three parts, an input birefringent beam displacer, a Faraday rotator, a half-waveplate, and an output birefringent beam displacer.

Polarization independent isolators are typically used in fiber laser systems to maintain frequency stability, such as industrial processing areas etc.

 

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