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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.


    • Introduction
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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%< span="">

    <10%< span="">

    <10%< span="">

    <10%< span="">

    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

    Product Type

    Wavelength(nm)

      Power (W)

    Datasheet

    Fiber-Free Space

    Single

    Expanded-Beam

    980/1030/1064

    30-200

    Expanded-Beam Isolator

    980/1030/1064

    20-120

    Isolator With Laser Pointer

    Non-Expanded Beam

    980/1030/1064

    10-70

    Non-Expanded Beam’s Isolator

    Dual

    Expanded-Beam

    980/1030/1064

    30-200

    Expanded-Beam Isolator

    Non-Expanded Beam

    980/1030/1064

    20-120



    Product number

    Type

    (t)

    Power

    (p)

    Fiber type

    (f)

    Wavelength

    (λ)

    Pigtaildiameter

    (e)

    Beam  diameter

    (b)

    Stage

    (s)

    Spot  shape

    ( d )

    Housing

    (h)

    HPISO-t-p-f-λ-e-b-s-d-h

    WLP

    (With Laser Pointer)

    200  W

    1

    (10/125SCF)

    2

    (20/130DCF)

    3

    (12/250SCF)

    4

    (20/250DCF)

    5

    (30/250DCF)

    6

    (PM 980)

    980nm

    1030nm

    1064nm

    ...

    C

    (6mm Armoured Cable)

    E

    (8mm Armoured Cable)

    L

    (900μm Loose Tube)


    5

    6

    7

    8

    9

    S

    (Single)

    G

    (Gauss)

    F

    (Flat-top)

    A09,...

    EB

    (Expanded Beam)

    A02,A05,...

    D

    (Dual)

    A11,...

    FF

    (Non-Expanded Beam)

    S

    (Single)

    A08,...

    D

    (Dual)

    /


    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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