Effective far infrared laser operation with mesh couplers

Densing, R.; Erstling, Arne; Gogolewski, Mark; Gemünd, H.-P.; Lundershausen, Gundula; Gatesman, Andrew J.

doi:10.1016/0020-0891(92)90016-m

Cited by 24 publications

(8 citation statements)

References 27 publications

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“…The cavity of the FIR gas laser is 1.5 meter long and the hole in the couplers is 10 mm in diameter. We choose the gas laser for testing the HWS since it has a Gaussian output beam and has a very low divergence as a result of large waist size [15]. The latter offers nearly an ideal planar wavefront.…”

Section: Design Of a Thz Hartmann Wavefront Sensormentioning

confidence: 99%

Terahertz wavefronts measured using the Hartmann sensor principle

Cui¹,

Hovenier²,

Ren³

et al. 2012

Opt. Express

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Abstract:We demonstrate for the first time that the Hartmann wavefront sensor (HWS) principle can be applied for characterizing the wavefronts of terahertz (THz) electromagnetic radiation. The THz Hartmann wavefront sensor consists of a metallic plate with an array of holes and a twodimensional scanable pyro-electric detector. The THz radiation with different wavefronts was generated by a far-infrared gas laser operated at 2.5 THz in combination with a number of objects that result in known wavefronts. To measure the wavefront, a beam passing through an array of holes generates intensity spots, for which the positions of the individual spot centroids are measured and compared with reference positions. The reconstructed wavefronts are in good agreement with the model expectations.

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Section: Design Of a Thz Hartmann Wavefront Sensormentioning

confidence: 99%

Terahertz wavefronts measured using the Hartmann sensor principle

Cui¹,

Hovenier²,

Ren³

et al. 2012

Opt. Express

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“…The input coupling is through a hole in the input mirror. The output coupler is a uniform capacitive mesh-type coupler [15], fabricated by the University of Massachusetts Lowell, STL and POD laboratories. Design of the mesh output couplers was accomplished using the GLAYERS program of CSIRO.…”

Section: Thz Lasermentioning

confidence: 99%

Terahertz local oscillator for the Microwave Limb Sounder on the Aura satellite

et al. 2007

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The Microwave Limb Sounder on the Aura satellite has a radiometer at 2.5 THz to perform global mapping of OH in the atmosphere. The OH radiometer utilizes two Schottky-diode mixers pumped by an optically pumped THz gas laser local oscillator. The laser was first turned on in space on July 22, 2004, and has performed without issue for more than 30 months. The specifications, design, and modeling of this 2.5 THz laser local oscillator are presented here, along with some of the important design validation and test results.

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“…In the past decades, several types of output couplers consisting of metal-strip-grating deposited on the dielectric substrates have been extensively used for the output windows of THz lasers [9,10] or FIR lasers [11] to achieve a specific transmissivity or reflectivity at THz frequencies. The use of output windows instead of pin-aperture mirrors guarantee uniform output coupling over the entire zone of the waveguide, resulting in a low diverging Gaussian beam and relatively high output powers [12,13]. High-resistivity silicon grown by the floating-zone method [14] has been shown to be extremely low loss below 3 THz [15] and thus is typically chosen as the substrate material of the output coupler.…”

Section: Introductionmentioning

confidence: 99%