Off-axis parabolic mirror

As an example of an experimental setup needed for the kind of experiments discussed above, we give now a brief overview of a recent experiment carried out by our group at the SLIC facility at CEA in Saclay (France) [10]. The laser system was the UHI-10 Ti Sa laser, which delivered 65 fs pulses with energy up to 0.7 J. The laser beam was focused by an //5 off-axis parabolic mirror, producing a quasi-gaussian spot where the field parameter ao = c/l aser/mec2,... 

A non-invasive infrared (IK) method has been developed for the measurement of temperatures of small moving fuel droplets in combustion chambers. 7111 The IR system is composed of two coupled off-axis parabolic mirrors and a MCT LWIR detector. The system was used to measure the temperature variations in a chain of monosized droplets generated with equal spacing and diameter (200 pm), moving at a velocity of >5 m/s and evaporating in ambient air. The system was also evaluated for droplet temperature measurements in flames under combustion conditions. 

Figure 17.4 Schematic of the T-jump spectrometer described in the text. OAP, off-axis parabolic mirror PB, Pellin—Broca prism P, polarizer L, lens S, sample MCT, mercury cadmium telluride detector. The size of the pump relative to the probe at the point of overlap is shown in the lower left comer.

Fig. 9.11. Focused beam spot size of the 27th harmonic wave as a function of distance from the SiC/Mg multilayer coated off-axis parabolic mirror. The open circles and filled squares correspond to the horizontal and vertical directions respectively. The best-fit curve based on (9.1) is also shown by the solid line...

The laser beam from each head is collected and focussed by an off-axis parabolic mirror, OAP, or 0APa and then directed to a selection mirror, S which flips back and forth to permit the beam from each of the diodes to enter the White cell in turn. 

M6, M7, M8, M9, M10, Mil, M12, and M13, aluminum mirrors PMl, 30° off-axis parabolic mirror PM2, 90° off-axis parabolic mirror MS, dielectric mirror used to cut off the fundamental wedged BS, wedged beam splitter, used to split the WLC into probe and reference beams PI, P2, P3, and P4, fused silica prisms LI and L2, lenses with focal lengths —50 and 75 mm, respectively [16], (Reproduced with permission.)... 

We have modified an NIR Fourier-transform spectrophotometer (JEOL JIR-5500) for the measurements of Raman spectra excited with the 1064-nm line of a continuous-wave Nd YAG laser (CVI YAG-MAX C-92) [60]. Raman-scattered radiation is collected with a 90° off-axis parabolic mirror in a back-scattering geometry. Collected radiation is passed through two or three long-wavelength-pass filters to reduce the Rayleigh scattering. 

FT-IR Optical Interface. The optical interface employed an aluminum base-plate attached to a Bomem MB-155 interferometer (see Figure 5). The baseplate extended over the burner and supported a deuterated triglycine sulfate (DTGS) detector. A hole was located in the middle of the base-plate to pass the flame. Two mirrors were mounted on pitch and yaw stages to transmit the infrared beam from the interferometer through the flame to an off-axis parabolic mirror,... 

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