HSSE Lab Survivor's Guide

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This section describes the bare minimum knowledge/skills required to survive in HSSE Lab activities.

Main Items

In summary, one must be able to:

  1. Create a magnetic field generator (MFG) circuit
  2. Set up a fiber-optic interferometer, and insert a magneto-optic (MO) material
  3. Set up MFG circuit
  4. Measure the optical and electrical output

Create Magnetic Field Generator (MFG) Circuit

To create a magnetic field generator circuit that has been extensively tested, simply do the following:

  1. Download the Eagle PCB board file: Eagle board file
  2. Upload the board file to the PCB manufacturing company OSH Park: Upload Eagle board file to OSH Park
  3. Purchase 3x units (which should result in approximately $30 + shipping)
  4. Purchase these components from Digi-Key: Parts spreadsheet
  5. Create a 16x turn coil with 28 AWG wire
  6. Follow this getting started guide to quickly get started with this circuit

Mfg schematic.png Mfg layout.png Mfg with coil.JPG

Set Up Interferometer

There are many different types of interferometers to setup, however one of the most stable interferometers is the Sagnac. To set up the Sagnac interferometer, we must follow a two-step process: (1) Setting up the interferometer and making the initial configurations and (2) adding the high-speed amplifier to observe transient responses.

Step 1 - Initial Setup

  1. Connect the green short cable to the laser output
  2. Connect the short cable > optical isolator > optical polarizer > port 1 of the optical circulator
  3. Connect port 2 of the optical circulator to port 1 of the coupler (white)
  4. Connect port 3 of the coupler (white) to port 4 of the coupler (blue) - at this time do not include an MO material
  5. Connect port 2 of the coupler (red) to the power sensor (#2)
  6. Connect port 3 of the circulator (purple) to the power sensor (#1)
  7. Ensure optical cables are taped down and bending loss is minimized by elongating each of the cables.
  8. Activate the laser (by pressing the "Active" button near the connector) and measure the output
  9. The power sensors should read greater power levels on the first sensor than the second (see image below)
  10. Now, insert an MO material (e.g. FLM-1550.5-EE-11.0) between the coupler ports 3 (white) and 4 (blue) - see How to Insert Magneto-Optic Material
  11. The measured output power should now look similar to each other


Before MO material is placed....


Sagnac schematic.png Sagnac interfeometer.JPG

Sagnac power.JPG Sganac connectors.JPG


After MO material is placed.... - see How to Insert Magneto-Optic Material


Insert mo material.JPG Sagnac power2.JPG

Step 2 - High Speed Amplifier

Now that we have verified the MO material does affect the output, we will add the high speed amplifier to observe transient pulses.

  1. Place port 2 of the coupler (red) into the portable power sensor (DET10C by ThorLabs)
  2. Connect the power plug into the DET10C and switch it to ON (the "|" symbol)
  3. Connect the output of the DET10C to the input of the high-speed amplifier
  4. Connect the output of the high-speed amplifier to Channel 2 of the Tekronix DPO 4032 Oscilloscope
  5. Connect the power cable of the high-speed amplifier to the +6V port of the Agilent E3631A DC power supply (black is negative, white is positive), and set the output to 5V limited to 0.100 A


Sagnac amp.JPG Sagnac amp2.JPG

Set Up Magnetic Field Generator (MFG) Circuit

  1. Place MFG circuit near the MO material, and attach the coil leads to one of the coil ports on the circuit (in the image the optical cables are supposed to be white and blue, not white and red). The other coil port can be unconnected or shorted, it will not be used here.
  2. Set the DC supply to be off
  3. Connect the DC power of the MFG circuit to the +25V port of the Agilent E3631A DC power supply (red is positive, black is negative) and set it to 15 V limited to 1.000 A
  4. Set the pulse generator output to OFF
  5. Connect the output of the pulse generator to the input of the MFG circuit
  6. Connect the output of the MFG circuit to Channel 1 of the Tekronix DPO 4032 Oscilloscope
  7. Set the pulse period to 10 milliseconds, pulse width to 10 microseconds, low amplitude to 0 volts, and high amplitude to 2.8 volts.
  8. Set the output load to be 50 Ω

Mfg with coil.JPG Electronic dc.JPG

Electronic pulse.JPG Electronic load.JPG


Measure the Electronic and Optical Output

  1. Turn ON the DC supply and set the pulse generator to ON
  2. Observe the electronic (yellow) and optical (blue) output pulse


Electronic output.png