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    Acousto-Optic Frequency Shifters
    3.1
    光纤耦合
    3.3
    3.1
    光纤耦合
    3.3
    • Acousto-Optic Frequency Shifters

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    Product description:

    The acousto-optic Frequency Shifter (AOFS) with RF driver is used to modify the frequency of the optical beam. Due to the Doppler shift, the frequency shift of 1st order diffracted light (variation quantity of wavelength) equals to the frequency of acoustic (wavelength) after the AO frequency shifters. If the incident direction of acoustic wave and optical wave are the same, the laser frequency shifts will be the positive value, anyway if the incident direction are opposite, the value of the laser frequency shifts will be the negative value.

    Applications such as interference-based optical techniques require a high extinction ratio between the diffracted and undiffracted beam; This can be achieved with a high-quality optical finish to minimize optical scatter.

    CASTECH offers standard products with frequency shifts of 73 MHz In addition, CASTECH provides the services of customize for center frequency and the value of frequency shifts.

     

    Applications:

    ● Interferometry

    ● Laser cooling

    ● Laser Doppler velocimetry

    ● Optical heterodyne detection

     

    Iintroduction:

    Fiber-coupled
    Interaction material TeO2
    Wavelength 1550 nm
    Damage threshold >1 GW/cm2
    RF frequency 73 MHz
    Frequency shift bandwidth ±3 MHz
    Acoustic mode Compressional
    Insertion loss < 4 dB
    Extinction ratio > 100 dB
    Fiber type FC/APC
    RF power 2.5 W  (max)
    RF connector SMA-F
    Cooling Conduction-cooled
    Shell material Aluminum alloy 6061
    Storage temperature -20~60 ℃

     

    Free-space
    Interaction material TeO2
    Wavelength 1064 nm or other
    Damage threshold >1 GW/cm2
    AR coating reflection <0.2 % per surface
    Transmission(Single pass) ≥97 %
    RF frequency 70/73/83 MHz or other
    Frequency shift bandwidth ±1,±3,±8  MHz or other
    Polarization Linear, vertical to base
    Aperture 1.0 mm or other
    Acoustic mode Compressional
    Rise time <120 ns/mm
    Diffraction angle 17.7,18.5,21.0 mrad or other
    Diffraction efficiency ≥ 70 %
    RF power 2 W  (max)
    RF connector SMA-F
    Cooling Conduction-cooled
    Shell material Aluminum alloy 6061
    Storage temperature -20~70 ℃

     

    CAFS-f-r-a-mt-w-c-h
    Center Frequency(f) RF Range(r) Aperture(a) Material(m) Mode(t) Wavelength(w) Connector(c) Housing(h)
    70 69~71MHz 1 Tellurium dioxide Compressional 1064 SMA A17
    73 70~73MHz 1 Tellurium dioxide Compressional 1064 SMA A17
    73 70~73MHz 1 Tellurium dioxide Compressional 1550 SMA A91
    80 70~90MHz 1 Tellurium dioxide Compressional 1064 SMA A17

     

    Product Number** Center Frequency(f) RF Range(r) Aperture(a) Material(m) Mode(t) Wavelength(w) RF Connector(c) Housing(h)
    CAFS-f-r-a-mt-w-c-h 70 MHz
    73 MHz
    83 MHz
    ...
    ±1 MHz
    ±3 MHz
    ±8 MHz
    ...
    ≤2 mm TE
    (TeO2)
    C
    (Compressional)

    S
    (Shear)
    1030nm
    1064nm
    ...
    SMA A17
    ...

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