4200-DR Series LaserSource

  • »4200-DR Series LaserSource

    The 4200 Series LaserSource is a high-accuracy, dual-range laser driver for low-power laser and LED applications. This laser driver offers features typically found in only more expensive units, such as overlapping laser protection systems, high modulation rates, and programmable PD bias.


    The 4200-DR Series LaserSource dual range laser diode driver is ideal for low power applications, such as butterfly and TO-can lasers, as well as many LED applications. The compact enclosure takes up little space and starting at only $995, the 4200-DR offers an excellent value.

    Many of our customers have switched to the 4300 after years of using other products, and they have all made the same discovery: Why spend significantly more when you can get the same performance for a fraction of the price?

    The LaserSource has all the features you would expect from a laser driver, such as safety interlock, ESD protection, and hardware limit circuits for current and voltage. Dual range allows this instrument to operate at half-scale for improved resolution.


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  • »Variable Gain Low-Noise Current Amplifier

    • Variable transimpedance gain from 103 to 1011 V/A
    • Input noise down to 4.3 fA/√Hz
    • Bandwidth up to 500 kHz
    • Rise time down to 700 ns
    • Adjustable bias voltage
    • Manual and remote control


    • Photodetector amplifier
    • Scanning tunneling microscopy (STM)
    • Spectroscopy
    • Beam monitoring for particle accelerators /synchrotrons
    • Ionization detectors
    • Preamplifier for lock-ins, A/D converters, etc.


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  • »Sub-Femto Ampere Sensitivity

    The values for bandwidth, rise time and integrated input noise stated in the table above are achieved with the low pass filter set to full bandwidth. Lower noise values can be achieved by setting the low pass filter to 0.7 Hz or 0.1 Hz. The minimum of 0.4 fA peak-to-peak noise is achieved in the gain settings 1012 and 1013 V/A with the low pass filter set to 0.1 Hz.

    Offset adjustable by potentiometer. Overload indication by LED and digital control output. Input protected against ±2 kV transients. Output short-circuit protected. Power supply via 3-pin Lemo® socket, a mating connector is provided with the device. Optional power supply PS-15 available. For further information please view the datasheet or contact FEMTO®.

    Transimpedance [V/A]104 105 106 107 108 109 1010 1011 1012 1013
    Bandwidth* (–3 dB) [Hz]400 400 400 400 150 150 20 20 1 1
    Rise Time* (10 % - 90 %) [ms]0.8 0.8 0.8 0.8 2.3 2.3 17 17 350 350
    Equ. Input Noise [/√Hz] 45 pA 45 pA 0.45 pA 0.45 pA 15 fA 15 fA 1.3 fA 1.3 fA 0.2 fA 0.2 fA
    AccuracyTransimpedance (Gain) ±1 %
    Low Pass Filter 3 settings: full bandwidth, 0.7 Hz and 0.1 Hz
    Output Range ±10 V, ±30 mA
    Bias Voltage Range ±10 V, max. 10 mA, connected to amplifier input, adjustable by trimpot or remote control voltage
    Power Supply±15 V, +70 mA / −15 mA typ.
    Control Interface 4 opto-isolated digital inputs, TTL/CMOS compatible, analog voltage input for bias control
    Case 170 x 60 x 45 mm (L x W x H), weight 320 g (0.74 lbs)

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