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Fiber-Free Space

CASTECH's high power fiber to free space isolators have center wavelength of 980/1030/1064nm, could maintain frequency stability in fiber lasers, fiber amplifier, optical sensor. High power fiber to free space isolators’ handling power up to 200W. CASTECH's fiber to free space isolators are with expanded beam output and Non-Expanded beam isolators are also available.


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CASTECH's high power fiber to free space isolators have center wavelength of 980/1030/1064nm, could maintain frequency stability in fiber lasers, fiber amplifier, optical sensor. High power fiber to free space isolators’ handling power up to 200W. CASTECH's fiber to free space isolators are with expanded beam output and Non-Expanded beam isolators are also available. The parameters can be customized according to customer requirements.

 

Features:                                                                        Applications:

◆ Center wavelength is 980/1030/1064nm                                    ◆ Maintain frequency stability in fiber

Peak Isolation ≥35dB                                                                        lasers, fiber amplifier, optical sensor   

Handling power up to 200W                                                         Used in fiber optic measuring equipment

Fiber input and expanded beam output or not                                  and optical coherence detection

The type of fiber is customized                                                      Widely used in industrial processing areas

 

Specifications:

Single Stage

Dual Stage

With Laser Pointer

Non-Expanded Beam

Center Wavelength

980/1030/1064nm

980/1030/1064nm

1064nm

980/1030/1064nm

Operating Wavelength Range

±10nm

±20nm

±10nm

±10nm

Peak Isolation

≥35dB

≥45dB

≥35dB

≥35dB

Isolation inbandat 23

≥25dB

≥35dB

≥25dB

≥25dB

InsertionLossat 23

≤0.4dB

≤0.6dB

≤0.5dB

≤0.4dB

Polarization DependentLoss

≤0.15dB

≤0.15dB

≤0.15dB

/

Return Loss (Input/Output)

≥50dB

≥50dB

≥50dB

≥50dB

M2 Degradation

<10%

<10%

<10%

<10%

Fiber Type

LMAFiber/PM Fiber or Specify

Operating Temperature

10-50℃

Storage Temperature

-10-60℃

Output Beam diameter(1/e2)

6,7,8mm or Specify

0.5mm or Specify

Optical Power(Average)

20,30,50,100,200W or Specify

10,20,30,50W or Specify

Peak Pulse Power

50KW or Specify

20KW or Specify

Laser Pointer

/

650nm,<5mw,>1m

/

Product specifications are subject to change without notice;

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

Note:All products are RoHS compliant.

 

 

Device

Type

Power

Handling (W)

Fiber Type

Wavelength(nm)

Pigtail

Diameter

Output Beam

Diameter(mm)

Isolator

Expanded Beam

30

50

100

200

1:10/125SCF

2:20/130DCF

3:12/250DCF

4:20/250DCF

5:30/250DCF

0:other

980

1030

1064

C:6mm

Armoured Cable

E:8mm

Armoured Cable

6

7

8

other

Square single stage:

Circular single stage:

L-type single stage:

100/200W dual stage:

100/200W single stage:

    Example: Model Number HPISO-EB-50-5-1064-E-6 described expanded beam isolator handling power is 50W, which fiber type is 30/250DCF,centred  wavelength is 1064nm, with 8mm armoured cable and 6mm output beam diameter.

 

 

Device

Type

Power

Handling (W)

Fiber Type

Wavelength(nm)

Pigtail

Diameter

Output Beam

Diameter(mm)

Isolator

With Laser Pointer

10

20

30

50

1:10/125SCF

2:20/130DCF

3:12/250DCF

4:20/250DCF

5:30/250DCF

0:other

1064

C:6mm

Armoured Cable

E:8mm

Armoured Cable

6

7

8

other

      Example: Model Number HPISO-WLP-50-2-1064-E-6 described expanded beam isolator with laser pointer handling power is 50W, which fiber type is 20/130DCF,centred  wavelength is 1064nm, with 8mm armoured cable and 6mm output beam diameter.

 

 

Device

Type

Power

Handling (W)

Fiber Type

Wavelength(nm)

Pigtail

Diameter

Fiber

Length  (mm)

Isolator

Non-Expanded Beam

10

20

30

50

1:10/125SCF

2:20/130DCF

3:12/250DCF

4:20/250DCF

5:30/250DCF

0:other

980

1030

1064

C:6mm

Armoured Cable

E:8mm

Armoured Cable

2:2.0

2.5:2.5

0:other

      Example: Model Number HPISO-FF-20-2-1064-E-2 described high power fiber to free space isolator handling power is 20W, which fiber type is 20/130DCF,centred  wavelength is 1064nm, with 8mm armoured cable and 2m fiber length.

 

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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