Fabry-Perot etalons

Figure 4. Fabry-Perot interference (a) Fabry-Perot etalon, (b) Fabry-Perot fringes, (c) Etalon transmission function for different plate transmissions.

Liang, W. Yang, L. Poon, J. K. Huang, Y. Vahala, K. J. Yariv, A., Transmission char acteristics of a Fabry Perot etalon microtoroid resonator coupled systems, Opt. Lett. 2006, 31, 510 512... 

Fabry-Perot cavity, 14 849, 850 Fabry-Perot etalons, 11 151, 152 Face-centered cube lattice, 8 114t Face-centered cubic (FCC) crystal structure in Ni-base alloys, 13 512 of spinel ferrites, 11 60 Facial makup, 7 846-847 Facial preparations, 7 842t Facial tridendate ligand, 7 578 Facihtated transport, 15 826-827 carrier, 15 845-846... 

Fabry Perot etalon Gallium arsenide crystal,... 

The joint gate function is centered around the frequency wo and the time to and acts as a filter on the bare signal /. As an example we shall consider the case when the spectral gate is given by the Fabri-Perot etalon [16] and the time gate is exponential,... 

Tunable filters in the form of AOTF devices, liquid crystal tunable filter (LCTF) and also tunable cavity Fabry-Perot etalon (FPE) devices have been considered in non-moving part instrument designs for many years. Today, the AOTF and the LCTF devices are used in the NIR spectral region.9,10 Originally, designs were also proposed for mid-IR AOTF devices, but these have not become available, mainly because of fabrication issues (cost and material purity). Tunable FPE devices, which are really just variable cavity interference filters, have been developed for the telecommunications industry. While these have been primarily used in the NIR, in most cases they can be fabricated to work also in the mid-IR, the latter being only an issue of material/substrate selection. 

We have studied first the OH radical in a low pressure flame (15 torr < p < 80 torr) to obtain quenching times longer than our pulse duration of 4 ns. This exciting radiation is derived from the second harmonic of a dye laser pumped by a nitrogen laser. An intracavity Fabry-Perot etalon assures a laser spectral width (AX = 2 10-12 m) closely matching the absorption line. We have excited the Qi7 line (X = 308.9734 nm) of the 2 +(v =0) - 2II(v"=0) transition of OH. 

Figure 8 Frequency interval between the fundamental mode and the first transverse mode of the Fabry-Perot etalon, measured as a function of the orientation of the plane of incidence of the auxiliary He-Ne laser. Similar behaviour has been observed for the dye laser radiation... 

Fig. 2. A typical pulsed, tunable dye laser, of the Hansch design, in an oscillator— amplifier configuration. Suitable pump lasers are Nj, excimer and Nd YAG-harmonics. The broken line represents a pressure chamber which is required to scan the wavelength if an air spaced Fabry—Perot etalon is used. With solid etalons, tuning is achieved by tilting the etalon and the pressure chamber is not required.

Interference filters are used in photometers and spectrometers as fixed wavelength or tunable wavelength filters. An interference filter, equivalent to a Fabry-Perot etalon. 

In Fabry-Perot etalons, the cavity encloses air, a gas, or vacuum, while for interference filters transparent dielectric layers are used. The real length of the interfering beam is N times the length of the cavity, due to multiple reflection. /V, the so-called finesse, is determined by the reflectivity p of the mirrors N = K , /pl( - p). Therefore, the resolving power, as above, equals the length of the interfering beam in units of the wavelength ... 

Figure 3.1-11 The significant features of Fabry-Perot-Etalons or interference line filters.

With the Fabry-Perot etalon method, x is obtained by measuring the intensity-dependent phase shift that results from the intensity-dependent refractive index. 

A Fabry-Perot etalon consists of two mirrors separated by a medium of refractive index n and thickness Z. When a beam enters the etalon it undergoes successive multiple reflections. The ratio between incident and transmitted intensity is given by ... 

Fig. 6 Transmission through Fabry-Perot etalon versus optical path length. The two curves correspond, for example, to different refractive indices of the etalon material and show a characteristic resonance behavior...

An etalon, reduced to its bare essentials, consists of two partially transmissive reflecting surfaces separated by a distance L. When a beam of monochromatic radiation is input to the etalon [see Demtroder (1996) pp. 140-152 for a discussion of Fabry-Perot etalons], and the frequency of this radiation is scanned,... 

Fig. 27 (a) Schematic of a traditional Fabry-Perot etalon (d, distance between two mirrors n, refractive index of the dielectric), (b) Schematic structure and proposed mechanism for our poly (N-isopropylacrylamide) microgel based etalons fabricated by sandwiching (b) a mictogel layer between (a, c) two reflective Cr/Au surfaces, all on (d) a cover glass. Reproduced with permission from [102]... 

DIFFUSIVITY OF ORGANIC LIQUIDS USING A FABRY-PEROT ETALON. 

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