Infrared output from a compact high pressure arc source

Rotational cooling of molecules using lamps

“…We now investigate this hypothesis under realistic experimental constraints. The energy density of light in a standard mercury lamp at the wavelength of interest (∼500 µm, corresponding to low-lying rotational transitions in MgH + ) is similar to a 4000 K BBR source (Kimmit et al 1996). Assuming unit magnification of the light source and a collection solid angle of 2π , which seems reasonable using a reflector and a large aperture molded lens (Nicolaisen 2003), the intensity of the lamp, in the important part of the spectrum at the position of the molecules, I lamp , can exceed five times the intensity of the BBR, I BBR , at a temperature of 300 K. Figure 2.…”

Tilt Angle Generation for Nematic Liquid Crystal on Blended Homeotropic Polyimide Layer Containing Trifluoromethyl Moieties

“…We now investigate this hypothesis under realistic experimental constraints. The energy density of light in a standard mercury lamp at the wavelength of interest (∼500 µm, corresponding to low-lying rotational transitions in MgH + ) is similar to a 4000 K BBR source (Kimmit et al 1996). Assuming unit magnification of the light source and a collection solid angle of 2π , which seems reasonable using a reflector and a large aperture molded lens (Nicolaisen 2003), the intensity of the lamp, in the important part of the spectrum at the position of the molecules, I lamp , can exceed five times the intensity of the BBR, I BBR , at a temperature of 300 K. Ground state population of MgH + after 60 s of cooling versus relative intensity of incoherent radiation from a lamp.…”

“…The presented cooling schemes are, from an experimental point of view, significantly simpler than our previous proposed schemes which required two laser-induced transitions (Vogelius et al 2002). The incoherent field is tailored for optimum cooling into the rovibrational ground state under the constraints set by the spectral density profile of a mercury lamp (Kimmit et al 1996). The timescale for the cooling is shorter than the typical unperturbed trapping time in an ion trap (Mølhave and Drewsen 2000) and comparable to realistic trapping times for neutral molecules (van de Meerakker et al 2001).…”

THz Detection Above 77 K in YBCO Films Patterned by Heavy-Ion Lithography

“…A continuous-wave FIR radiation, simulating a broadband THz source, was produced by a high pressure Hg arc lamp (OSRAM HBO 100 W) [21], without concentrating mirrors. The arc lamp generates a rather flat FIR spectrum (frequency below 3 THz, wavelength large than 100 ), that was selected by proper filtering.…”

“…5 corresponds to a FIR radiation, without MIR components, due to the efficient Zitex filtering. Considering a black-body equivalent temperature of 4000 K for the arc lamp [21], the flux of thermal radiation ( per wavenumber in ), is given by the Rayleigh-Jeans formula [23] The total power in the THz region is evaluated integrating this formula from 10 to 100 and taking into account the geometrical parameters (solid angle and detector area) and the transmission coefficient of the filters (about 40%, see Fig. 2).…”