Folded cavity

MM Extended Range Tracer with Folded Cavity Concept.. P 510... 

Fig. 9.18 Examples of ring resonators with (a) conventional race track and (b) folded cavity geometries...

Xu, D. X. Densmore, A. Delage, A. Waldron, P. Janz, S. Lapointe, J. Lopinski, G. Mischki, T. McKinnon, R. Cheben, P. Schmid, J. H., Folded cavity SOI microring resonator sensors for high sensitivity and real time measurement of biomolecular binding, Opt. Express 2008, 16, 15137 15148... 

Figure 9.22 shows the experimental setup, in which M4 was the SWCNT mirror [164]. An X-fold cavity was used, with the fundamental pulse repetition rate being... 

A Kerr-lens mode-locked Ti Sapphire laser with a threshold that is ten times less than in conventional Kerr-lens lasers has been reported by Fujimoto and his group [679]. The schematic diagram of this design with an astigmatically compensated folded cavity is shown in Fig. 6.25. The dispersion of the cavity is compensated by a prism pair and the output coupler has a transmission of I %. The low threshold permits the use of low-power inexpensive pump lasers. 

Fig. 5.41. Mode selection in the cw dye laser with a folded cavity using a birefringent filter, a tilted etalon, and a prism FPI (Coherent model 599). The folding angle is chosen for optimum compensation of astigmatism introduced by the dye jet...

Figure 9.11 Folded-cavity configuration for dye laser pumped by an argon ion or frequency-doubled Nd YAG laser. The optics denoted M are >99.9% reflecting at the incident wavelength. The dye jet is flowed along an axis perpendicular to the plane of the paper. The Lyot plate provides wavelength tunability (see text).

The gain volume is at the focal point of a folded cavity, consisting of two spherical mirrors and a flat output coupler. Tuning is accomplished with a birefringent, so-called Lyot filter [8.71]. This consists of one or several crystalline quartz plates mounted at the Brewster angle. The dominant transmission maximum of this filter can be moved by turning the optical axis of the filter with respect to the plane of polarization of the light in the... 

In order to achieve a symmetric beam waist profile of the dye laser mode in the active medium, the astigmatism produced by the spherical folding mirror M3 in the folded cavity design has to be compensated by the plane-parallel liquid slab of the dye jet, which is tilted under the Brewster angle against the... 

The cross view of the SEM pictnres can also be used to examine the phase separation phenomena in the membranes therefore, the compatibility between the two composites can be verified [16]. Zhou et al. have observed the cross-sectional images of poly(vinyl alcohol) modified quatemized hydroxyethylcellulose ethoxylate (PVA/ QHECE) composite membranes both for OH" form and for CFform (Figure 10.5B). Small shallow folded cavities were observed to be irregularly distributed in PVA/ QHECE membrane and became obvious with increasing QHECE content in polymers. Therefore, the compatibility between PVA and QHECE is poor when in so high content of QHECE [71]. 

---