Thorlabs’ FRU Terahertz (THz) module, as shown in the picture above, is a kit that contains optomechanical parts for housing a terahertz (THz) transmitter or receiver chip and a silica lens. The chip and lens are not included in the module.
There is a substantial growth of research interest in the Terahertz (THz) region sandwiched between the infrared and microwave spectral bands of the electromagnetic spectra. Features of the THz region include:
Wavelength range: 100μm to 1000μm (300GHz to 3THz)
Photon energy range: 1.2 to 12.4meV
Black body temperature range: 14K to 140K, below the earth's ambient background
Potential Applications of Thorlabs THz Transmitter/Receiver Opto-Mechanical Module include:
THz-TDS Terahertz Time Domain Spectroscopy (Refer to Application Tab above to see a THz-TDS system set up)
THz-DTDS Terahertz Differential Time Domain Spectroscopy
Interferometry
Refer to the Components Tab above to see the components of the FRU module. Note that the transmitter/receiver chips and silica lenses are not included.
The image at the top of the page shows the FRU with a receiver/transmsitter chip installed.
Application of Thorlabs THz Transmitter/Receiver Opto-Mechanical Module in THz Time Domain Spectroscopy (THz-TDS)
The Ultrafast Terahertz Research Group at Oklahoma State University (OSU) in Stillwater, Oklahoma, has put together a THz Time Domain Spectroscopy (THz-TDS) system based on Thorlabs' FRU opto-mechanical components. Their system includes two FRU modules; one houses a transmitter and the other houses a receiver. Refer to Figure 1 below to see a diagram of their THz-TDS set up.
In their system a femtosecond laser is used to illuminate the THz-transmitter, biased coplanar transmission lines fabricated on high-resistivity GaAs that has geometry similar to that shown to the left of the diagram below (Figure 3). The laser is focused on the edge of the positively biased line and generates a very large number of photo-induced charge carriers in the high electric field region, creating synchronous bursts of THz radiation.
Their receiver FRU includes a THz-receiver chip that has antennae structures fabricated on an ion-implanted silicon-on-sapphire (SOS) wafer. The antennae structures have geometries as shown to the right of the diagram below (Figure 2). The pulsed THz radiation is focused between the gap of an antenna and induces a transient bias voltage. The portion of the femtosecond laser beam that is directed into the receiver is also focused onto the antenna, inducing a transient photocurrent that synchronously gates the receiver. One can consider this detection process a sub-picosecond boxcar integrator.
With the FRU transmitter/receiver opto-mechanical module, OSU's Ultrafast Terahertz Research Group has scanned out past 5 THz. Their system generates THz radiation with ~10nW average power and a signal-to-noise ratio of 10,000:1. The generated and detected THz radiation is coherent and the resulting receiver sensitivity is ~1000 times more sensitive than an incoherent liquid helium cooled bolometer.
Response from Javier at Thorlabs to nimibachar: Thank you for your feedback. The Tera8 antenna is compatoble with the FRU(/M) holder. In order to integrate it, you need four extra ER05 rods, and preferably longer #4-40 studs (8mm long instead of 6 mm). I will contact you directly with photos and links.
Poster: nimibachar
Posted Date: 2010-07-27 20:03:18.0
We are currently setting up a custom made Time domain THz spectroscopy system. In addition to our optical components we have purchased Menlo System THz antennas Model TERA8. We would like to know if this product will fit to the FRU/M holder. We would also like to know what are the additional items needed for a full operational antenna (lens for the THz path, lens for the Optical path and so on).
Thanks
Poster: Javier
Posted Date: 2010-06-09 14:45:55.0
Response from Javier at Thorlabs to rbjaculbia: this lens will not fit, due to the slightly larger diameter of the SM05 lens tube, which is designed for 12.7 mm diameter optics. However, we may be able to offer an adapter for you. I will contact you directly to discuss the details.
Poster: rbjaculbia
Posted Date: 2010-05-31 01:44:11.0
If I have a hyperspherical lens with 10mm diameter and 5mm thickness, will this fit in the FRU? Thanks
Poster: apalmentieri
Posted Date: 2009-12-15 09:16:55.0
A response from Adam at Thorlabs: The FRU mount only comes with mechanical products and does not include the silicon lens or the THz antenna. Therefore, we do not have Tx or Rx data. An antenna is offered by Menlo systems and I will email you with more information about this product.
Poster: chan
Posted Date: 2009-12-15 02:25:41.0
How can I get a Tx and Rx?
Poster: klee
Posted Date: 2009-12-14 12:33:42.0
A response from Ken at Thorlabs to rbjaculbia :
The hyperspherical Si lens is placed with the flat surface against the Thz chip and S1TM09 is positioned so that the curved surface of the lens is in the center hole. When the S1TM09 is adjusted it slides the lens on the THz chip.
The part attaches to the ST1XY-D behind the transmitter/receive is the CP02.
Poster: rbjaculbia
Posted Date: 2009-12-10 02:18:37.0
In the THz Transmitter/Receiver Opto-Mechanical Module, we noticed that an aspheric lens adapter (S1TM09) is included in the components list, however, no aspheric is lens is in the list, so what is this part for (S1TM09)? Also, what part attaches to the xy translator (ST1XY-D) behind the transmitter/receiver?
Poster: jens
Posted Date: 2009-05-19 08:45:15.0
A reply from Jens at Thorlabs: the fiber coupling option is referring to fiber coupling the pump and probe beam. This configuration has successfully been used by the team at Oklahoma State university. In order to select components which are suitable for your setup I will get you in direct contact with the development engineers.
Poster: pillo.ep91g
Posted Date: 2009-05-19 02:28:18.0
I have noticed that you metioned "fiber coulping by request" at this page. Does it mean you guiding the fentosecond laser to the chips by fiber? If so, what kind of optical elements (fibers, collimators, couplers...)you recommend? especilly for high power laser. Thanks
Allen Lin
Poster:
Posted Date: 2009-05-19 02:24:35.0
I have noticed that you metioned "fiber coulping by request" at this page. Does it mean you guiding the fentosecond laser to the chips by fiber? If so, what kind of optical elements (fibers, collimators, couplers...)you recommend? especilly for high power laser.
Poster: Tyler
Posted Date: 2009-04-30 15:13:34.0
A response from Tyler at Thorlabs to lesley.hess: You are correct that the transmitter/receiver chip is not included in the FRU kit. To clear up the presentation I added a second picture without the chip. This new picture is also used for the image loaded by clicking on the part numbers at the bottom of the page. I did leave the image at the top of the page with the chip because it shows the location where the chip will need to be installed. Thank you for taking the time to review the presentation and submit feedback.
Poster: lesley.hess
Posted Date: 2009-04-29 12:18:34.0
@ttang: The SMC Connector part that you see in the picture is not included since the chip was mounted to that. I helped with this project at Oklahoma State University.
Poster: Laurie
Posted Date: 2009-02-19 08:51:01.0
Response from Laurie at Thorlabs to ttang: Someone from our technical support staff is going to contact you directly, as we are unsure what you mean by the "SMC connector." As for your question about the lens, the spot size will depend on your input beam specifications. If you were to replace the lens, you would either need to purchase another lens with a 12.7 mm diameter or use an adapter.
Poster: tttang
Posted Date: 2009-02-17 16:28:55.0
I have a few questions about FRU THz antenna opto-mechanical module.
Does it include the mount for antenna chip? (the SMC connector part in picture)
By using the plano-convex lens (f=15.0mm), how tight is the focus point? Could we replace this lens by the other lens?
For the Si lens, is it attached on the antenna chip or it will have a gap between si lens and antenna chip?
We already have two Si lens with 10mm in diameter. Is it suitable for this module?
Poster: Laurie
Posted Date: 2008-12-04 08:18:18.0
Response from Laurie at Thorlabs to barry.t.smith: Thank you for your interest in our THz transmitter/receiver module. Through our partnership with Menlo Systems, we can offer a Terahertz transmitter/receiver. We will contact you shortly with more information.
Poster: barry.t.smith
Posted Date: 2008-12-03 08:36:04.0
Do you carry the THz chips for transmitter and receiver?
Thank you.
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FRU
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THz Transmitter/ Receiver Mounting Module
