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Optics

Tools of the trade - Vol 18 - 36188 Scanning Fabry-Perot Controller Box

Optical Systems The SA201 is specifically designed to control Thorlabs Fabry Perot Interferometersby generating a high stability, low noise voltage ramp. This ramp signal is used to scan the separation between the two cavity mirrors. The controller provides adjustment of the ramp voltage and scan time, allowing the user to choose the scan range and speed while an offset control is provided to allow the spectrum displayed on the oscilloscope to be shifted right or left. The output trigger allows the user to externally trigger an oscilloscope on either the beginning or midpoint of the ramp waveform. The ability to trigger the oscilloscope from the mid-point makes zooming in on a line shape more convenient; just place the spectral component of interest on the center of the screen and increase the timebase of the scope. There is no need to use the offset to re-center the signal; the scope expands about the point of interest.Another convenient feature of the controller is a calibrated zoom capability that pro-vides a 1X, 2X, 5X, 10X, 20X, 50X and 100X increase in the length of theramp signal, thus allowing an extremely wide range of scan times. The output TTLlevel trigger allows the user to externally trigger an oscilloscope on either the begin- ning or midpoint of the ramp waveform. The SA201 also includes a high precision photodetector amplifier circuit usedto monitor the transmission of the cavity. The amplifier provides an adjustable tran- simpedence gain of 10k, 100k, and 1MV/A when driving a high impedance load,such as an oscilloscope. Using the output sync signal from the controller,an oscilloscope can be used to display the spectrum of the input laser. The detector circuitry incorporates a blanking circuit, which disables the photodiode response during the falling edge of the sawtooth waveform.
PPLN Devices

Photo Amplifier Specifications:

â–  Gain Steps: 0, 10, 20dB
Spherical Singlets â–  Transimpedence Gain (Hi-Z): 10K, 100K, 1M V/A
Multi-element Lenses ■ Transimpedence Gain (50 Ω ): 5K, 50K, 500K V/A
Cylindrical Lenses â–  Output Voltage: 0-10V min.
Aspheric Lenses â–  Bandwidth: 250KHz
â–  Noise (RMS):
Mirrors 10K V/A, <0.1mV100K V/A, 0.2mV 1M V/A, 1.5mV
Windows & Diffusers

Ramp Specifications:

Prisms â–  Waveform: Sawtooth/Triangle
â–  Output Voltage Range: 1 to 45V (off-set + amplitude)
Gratings â–  Offset Range: 0 to 15VDC
Diffractive Optics â–  Amplitude Range: 1 to 30V
â–  Risetime Range:
Polarization Optics 1X Sweep Exp. 0.01 to 0.1s100X Sweep Exp. 1 to 10s
Beamsplitters â–  Sweep Expansion: 1X, 2X, 5X, 10X,20X, 50X, 100X
Filters & Attenuators â–  Sweep Scale Error: ±0.5%
â–  Output Noise: 1mV (~6.6mV )
Gas Cells RMS PP â–  Trigger: Ramp Start or Midpoint
â–  The Photo Amplifier-Blanking Feature blocks signals during the sawtoothfall time.
â–  Switch selectable sawtooth or triangle waveform
â–  High Precision, Low Noise Output provides high measurement accuracy
â–  Recessed rise time & amplitude controls ensure calibration is maintained.
â–  Output Trigger on the ramp start & midpoint

HIGH PRECISIONLOW NOISE!

SA201 SA201 Controller, Compatible with all SA200 & SA210 Interferometers
ITEM #$£ ¥DESCRIPTION SA201$825.00£618.75 866,25¥140,250Control Box for the SA200 Family of Interferometers Sales: 973-579-7227
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