Short cavity

Fig. 1.8 Optical mode density for (a) a short and (b) a long cavity with the same finesse F. (c) Spontaneous free-space emission spectrum of an LED active region. The spontaneous emission spectrum has a better overlap with the short-cavity mode spectrum compared with the long-cavity mode spectrum.

Recently, there has been appeared new interest in lasers with a short cavity [5], motivated by several reasons First, the study of the dynamics in this regime has become experimentally accessible. Also, this regime is very interesting from the dynamical point of view, since it has an intermediate... 

The tuning characteristics of a diode laser are not very satisfying for spectroscopic applications. The gain curve comprises mostly one to three longitudinal modes of the short cavity and it is tuned across them by the current, which modifies both temperature and the refractive index. One of these modes can be selected externally by a grating spectrograph of high transmission. 

Distributed Bragg reflector (DBR) and distributed feedback (DFB) fiber lasers have relatively short cavities, e.g., 10 cm or less, facilitated by the use of heavily doped-fiber amplifiers. The aim is to provide increased cavity mode... 

Lester, L.F., Schaff, W.J., Song, X., and Eastman, L.F. 1991. Optical and RF characteristics of short-cavity-length multiquantum-well strained-layer lasers. IEEE Phot Tech. Lett. 3 1049-1051. 

The structure of a FBG Fabry-Perot cavity sensor is shown in Fig. 10.4(a), which consists of two identical FBGs separated by a short cavity with a length of L. If the reflectivity of the two FBGs, Rg X is small, the reflection spectrum of the FBG Fabry-Perot cavity sensor, RgcW, is approximately given by ... 

Spears, K. G. Zhu, X. Yang, X. Wang, L. Picosecond infrared generation from neodymium-doped YAG and a visible, short cavity dye laser. Opt. Commun. 1988,66,167-171. 

An alternative approach to obtaining microwave spectroscopy is Fourier transfonn microwave (FTMW) spectroscopy in a molecular beam [10], This may be considered as the microwave analogue of Fourier transfonn NMR spectroscopy. The molecular beam passes into a Fabry-Perot cavity, where it is subjected to a short microwave pulse (of a few milliseconds duration). This creates a macroscopic polarization of the molecules. After the microwave pulse, the time-domain signal due to coherent emission by the polarized molecules is detected and Fourier transfonned to obtain the microwave spectmm. 

IS added to the short-range molecule-molecule interaction. Problems with the reaction ethod may arise from discontinuities in the energy and/or force when the number of les j rvithin the cavity of the molecule i changes. These problems can be avoided by dng a switching function for molecules that are near the reaction field boundary. 

---