In cold atom physics and quantum information experiments, it is necessary to precisely control the laser frequency. For example, the laser frequency is either locked to atomic resonant transition lines or locked to a reference cavity via PDH technique. Preci-lock, a fully functional locking controller, is introduced to precisely control the frequency of the laser for customs. Preci-lock includes modulation and demodulation module, PID module and high voltage amplifier module. And Preci-lock integrates functions of error signal generation, PID servo and PZT. Preci-Lock is controlled by the software without physical buttons and knobs. The signals are displayed on PC without signal acquisition instruments such as oscilloscope.

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    Main Specification

    Preci-beat, a dedicated locking controller for Beat frequency locking/Beat phase locking, is also introduced to differential frequency outputting of the laser and phase difference locking for customs. 

    For integrated system or portable laser system, PreciLasers offers an integrated optical path or integrated stabilized modules. Frequency stabilization can be achieved by PC software with little laser power. Integrated optics modules connected in the form of full optical fiber are provided to help customers adapt to the more complex environment.

    A fully functional laser locking controller (Preci-Lock) developed by Precilasers can be used for frequency locking in different application scenarios. Preci-Lock integrating modulation and demodulation module, PID module and high voltage amplifier module. It integrates the functions of error signal generation, PID servo and PZT drive. Preci-Lock can been used as locking controller for a variety of common frequency stabilization techniques, such as absorption spectrum, saturated absorption spectrum, modulation spectrum, modulation transfer spectrum and PDH technology.


    The Preci-Lock controller mainly includes the modulation and the demodulation module, the PID module and the high voltage amplifier module. In addition, it also includes a RS422 protocol communication interface and a ±12V power supply interface. The preci-lock can be satisfied for most common requirements of laser frequency stabilization.

    Modulation & Demodulation Module

    Modulation Power Range
    0-1023(Max. 10dBm)
    Modulation Output Frequency
    Phase Regulation Range
    PD Signal Input Range
    PD Signal Input Coupling
    AC Coupling
    PD Signal Input Coupling Impedance
    50 Ω


    The modulation and demodulation module modulate the laser, and demodulate the spectral signal detected by the detector to produce error signal. The modulation frequency can be customized according to customer.

    PID Module

    Fast Output PID
    Single- Channel PIDP
    Slow Output PID
    PIDP+ PI Tandem
    PIDP Integral Folding Frequency 
    (3.4 kHz-34 kHz) , (1 kHz-10 kHz) , (330 Hz-3.3 kHz) , (100 Hz-1 kHz) , (33 Hz-330 Hz) , (10 Hz-100 Hz) , (3.3 Hz-33 Hz) , (1 Hz-10 Hz)
    PIDP Differential Folding Frequency 
    16 kHz , 34 kHz , 59 kHz , 133 kHz , 284 kHz , 483 kHz , 724 kHz
    PI Integral Folding Frequency
    33 kHz , 10 kHz , 3.3 kHz , 1 kHz , 330 Hz , 100 Hz , 33 Hz
    Fast Output
    Output Bandwidth
     500 kHz
    Output Range
    -9 V-9 V
    Bias tuning Range
    0-9 V
    Gain tuning Range
    Output reverse function
    Slow Output 
    Output Bandwidth
     500 kHz
    Output Ranges
    -9 V-9 V
    Bias tuning Range
    0-9 V
    Gain tuning Range
    Output reverse function
    Scanning frequency
    2 Hz
    Scanning waveform
    Triangular Wave
    Maximum Scanning Range
    0-9 V
    Error signal bias adjustment
    -2 V- 2 V
    0.25 mV
    Error Signal Input
    Unsaturated range
    -0.5 V-0.5 V
    Input Impedance
    Lock Reference Input
    Input Range
    -9 V-9 V
    Input Impedance
    1 MΩ

    The frequency of the laser can be controlled by PID module through feedback signal according to the error signal. PID module in Preci-lock is in series PID structure, including two PI, and offering two output ports, the parameters of the module can be adjusted with high precision.

     High voltage amplifier module

    Output Range
    0-110 V
    High resistance load bandwidth 50 kHz
    Capacitive load bandwidth (small signal output (0.1 uF load) 20 kHz
    Drive Capability(Max. Output Current )
    50 mA


    Some lasers or devices require high dc voltage to drive the PZT. Preci-lock's built-in high dc voltage amplifier module can output a voltage signal of up to 110V with its 15 times amplification.


    Control Software

    For a better laser frequency control, Preci-Lock abandons the physical knobs and buttons. And all parameter changes and locking control are realized by the PC software.
    Preci-lock software includes the functions of communication control, reference and error signal display, PID module parameters adjustment, locking control and so on. Except the necessary physical connection, the laser locking control can be fully realized by Preci-Lock software. A pure digital operation is more convenient for user. Another feature of Preci-Lock software is the automatic locking function, which can realize the automatic locking of laser frequency under reasonable parameter settings. In automatic locking mode, Preci-Lock can realize auto locking, unlock judging and re-locking of the laser frequency. This mode can realize the long-term stable locking of laser frequency, especially suitable for the cold atom physics experiment that requires long-term continuous measurement.


    As a fully functional locking control module, Preci-Lock can meet the most demands of frequency locking. The frequency locking can be divided into internal modulation and external modulation frequency locking according to the different modulation. The two frequency locking methods are different in principle while the physical connecting of Preci-Lock is also different for them.

    Internal Modulation Frequency Stabilization

    For internal modulation, the modulation signal and feedback signal feedback together to the laser through an adder. The frequency lock point corresponding to the wave peak and wave trough of the spectra.  Typical internal frequency stabilization modulation is adopted in lock-in saturation absorption spectrum or absorption spectrum frequency stabilization.

    External Modulation Frequency Stabilization

    For external modulation, the modulation signal and feedback signal are divided and the external modulation signal is applied to an external independent modulator. The frequency lock point corresponding to the zero point of the spectra. Typical external frequency stabilization modulation is adopted in modulation transfer spectrum or PDH frequency stabilization.




    Key Features:





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