Silver halide single-mode fibers for the middle infrared

Shalem, Shaul; Tsun, A.; Rave, Eran; Millo, Arnon; Nagli, L.; Katzir, Abraham

doi:10.1063/1.2034102

Cited by 30 publications

(17 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the properties opposite phase tion, dispersion eam train [42] , he irements must (at 632 nm wa nce was adjust tion of a polar to the importa e incoming wa unwanted mod r spacecraft [38] [43] d conquer, init frared [14] Se prism and f h the phase and oss the directio s refocused on he mirror a sma reduces the ov an be used to r pixels across stbed, but not separately adj ment level mid-10 −5 and the te ncoming beams organ et al [51] ncing the optica constant over g an amplitude e became the A Laboratory sta gth end (~ 6-12 fibers [45] , prosp omising more) modes higher th omatic Nulling halide fibers ev 00 requirement) bandwidth can be improved using pairs of plates of different materials. 2/, relative field reversal can also be achieved, potentially achromatically by reflection in an antisymmetric set of mirrors.…”

Section: Ng Technmentioning

confidence: 99%

TPF-Interferometer: a decade of development in exoplanet detection technology

et al. 2011

View full text Add to dashboard Cite

The last decade has seen great advances in interferometric nulling technology, propelled at first by the SIM and KECK nulling programs and then by the Terrestrial Planet Finder Interferometer (TPF-I). In the infrared at N-band (using a CO 2 laser at 10.6 micron wavelength) the first million to one nulls were reported on a KECK testbed in 2003. For TPF-I, nulls needed to be both deep and broadband, and a suite of testbeds was designed and built to study all aspects of achromatic nulling and system implementation, including formation flying technology. Also, observatory designs were drawn up and studied against performance models. Modeling revealed that natural variations in the alignment and control of the optical system produced an "instability noise" signal and this realization eventually led to a redesign of the layout to a rectangular formation. The complexity of the early TPF-I spacecraft design was mitigated by the infusion of ideas from Europe and produced the current X-Array design which utilizes simple reflectors to form the apertures together with a stretched three dimensional formation geometry. This paper summarizes the main achievements of the infrared nulling technology program including the development of adaptive nulling for broadband performance and the demonstration of starlight suppression by 100 million to one.

show abstract

Section: Ng Technmentioning

confidence: 99%

TPF-Interferometer: a decade of development in exoplanet detection technology

et al. 2011

View full text Add to dashboard Cite

show abstract

“…However, it is difficult 8,9 to fabricate low loss core-clad fibers, since the interface between the core and the clad is not smooth and therefore a significant amount of energy is scattered away from the core. It is even more difficult to fabricate SMFs since both the dimension of the core and the difference between the indices of refraction of the core and the clad must be small.…”

Section: ≤ ≤mentioning

confidence: 99%

Segmented cladding fibers for the middle infrared

et al. 2006

View full text Add to dashboard Cite

We report the design, fabrication and optical characterization of total internal reflection segmented-cladding fibers for the middle-infrared spectral range 2-20µm. Segmented cladding is a novel fiber design in which the uniform core of high refractive material is surrounded by a cladding of alternating segments of high and low refractive indices. Segmented cladding fibers are capable of maintaining a single-mode operation over a wide spectral range with a large core area. The design of the fibers and the simulations were made using the radial effective index method. The fibers were extruded from silver-halide crystals by using the 'rod in tube' method. Using this method we were able to construct large core fibers which exhibited few-modes and relatively low losses at 10.6µm.

show abstract

“…This provides confirmation of single mode operation if the null depth improves greatly, but does not help in troubleshooting the fiber if not enough improvement is observed. Shalem et al 4,5 have demonstrated a near-field scanning technique whereby an IR fiber with a sharp end is scanned along the output end of the tested fiber. It has been shown to detect single Gaussian-like peaks in the core region of single mode fibers as well as multiple peaks in multimode IR fibers.…”

Section: Introductionmentioning

confidence: 99%

Measurement of spatial filtering capabilities of single mode infrared fibers

Ksendzov

Bloemhof

White

et al. 2006

Advances in Stellar Interferometry

Self Cite

View full text Add to dashboard Cite

Spatial filtering is necessary to achieve deep nulls in optical interferometer and single mode infrared fibers can serve as spatial filters. The filtering function is based on the ability of these devices to perform the mode-cleaning function: only the component of the input field that is coupled to the single bound (fundamental) mode of the device propagates to the output without substantial loss. In practical fiber devices, there are leakage channels that cause light not coupled into the fundamental mode to propagate to the output. These include propagation through the fiber cladding and by means of a leaky mode. We propose a technique for measuring the magnitude of this leakage and apply it to infrared fibers made at the Naval Research Laboratory and at Tel Aviv University. All measurements are performed at 10.5 µm wavelength.

show abstract

Silver halide single-mode fibers for the middle infrared

Cited by 30 publications

References 11 publications

TPF-Interferometer: a decade of development in exoplanet detection technology

TPF-Interferometer: a decade of development in exoplanet detection technology

Segmented cladding fibers for the middle infrared

Measurement of spatial filtering capabilities of single mode infrared fibers

Contact Info

Product

Resources

About