http://ieeexplore.ieee.org TOC Alert for Publication# 3 2012 February 10 ${{rm CH}_{3}}{^{17}{rm OH}}$ isotopic form of methanol has been investigated as a far-infrared laser medium for the first time. Using two distinct experimental systems, this investigation has resulted in the discovery of twelve far-infrared laser emissions that range in wavelength from 69.7 to 642.9 $mu{rm m}$. Along with the wavelength, each laser emission is reported with its optimal operating pressure and relative intensity. The frequency for the 69.7 $mu{rm m}$ line was measured to be $4,302,957.7 {pm}{rm 1.0}~{rm MHz}$ and is reported with the ${rm CO}_{2}$ pump laser's offset frequency relative to its center frequency.]]> 48 3 303 306 1224 $z$-transform-based description of the device.]]> 48 3 307 317 1451 $mu{rm m}$, respectively. We show that a larger mode size not only shifts the mode locking regime of operation toward higher powers, but also produces other improvements with respect to two main failure mechanisms that limit the output power, catastrophic optical mirror damage and catastrophic optical saturable absorber damage. For the 830-nm material structure, we also investigate the effect of nonabsorbing mirrors on output power and mode locked operation of colliding pulse mode locked lasers.]]> 48 3 318 327 1820 ${rm M}^{2}$ beam propagation factor of the diamond Raman laser measured to be ${<}{1.2}$. Although higher output powers are demonstrated in a similar configuration using ${rm KGd}({rm WO}_{4})_{2}$ (KGW) as the Raman laser material (6.1 W), the brightness enhancement is much lower (2.5 fold) due to the poorer beam quality of the KGW Raman laser $({rm M}^{2}<6)$. The Raman gain coefficient of single-crystal synthetic diamond at a pump wavelength of 1064-nm is also measured: a maximum value of $21pm 2~{rm cm}/{rm GW}$ is returned compared to $5.7pm 0.5~{rm cm}/{rm GW}$ for KGW at the same wavelength.]]> 48 3 328 337 1147 48 3 338 344 2035 48 3 345 352 548 48 3 353 360 850 $n$-type germanium $(n{hbox{-}}{rm Ge})$, is used as one of the constituent layers. The occurrence of multichannel feature originates from the negative-permittivity in the highly doped $n{hbox{-}}{rm Ge}$. The existence of tunable feature is due to its concentration-dependent permittivity. It is of interest to find that, in such MCFs, the number of channels, i.e., the number of resonant transmission peaks, is directly related to the stack number, and these peaks are located within the pass band of the ideal host PC. The multiple channels are blueshifted as the impurity concentration increases. This design suggests an alternative of engineering the pass band for realizing an MCF instead of engineering photonic band gap in a PC containing photonic quantum well structure as a defect. Our analysis is made based on the transfer matrix method together with the Bloch theorem.]]> 48 3 361 366 581 48 3 367 374 945 48 3 384 393 1474 ${-}{rm 150}~{rm dB}/{rm Hz}$. The optimum and the shortest external cavity length that provides the minimum RIN is found to be around 3.1 cm. In addition, by optimization, the relaxation oscillation frequency of RIN spectra is shifted toward around 5.6 GHz.]]> 48 3 375 383 613 $chi^{3}$ and also linear terms due to back scattering between counter-propagating modes. The model can handle a large number of modes and complex third order nonlinear processes such as self-suppression, cross-suppression and four wave mixing occurring due to both interband and intraband effects. Every aspect of the lasing characteristics of SRLs, including lasing spectra, light-current curves and lasing direction hysteresis, can be reproduced by the model. To assess the performance and validity of the model, several miniaturized SRLs are designed, fabricated and tested. Stable unidirectional lasing in SRLs is also demonstrated by introducing asymmetric feedback from external facets. Good agreement between theoretical and experimental results is demonstrated.]]> 48 3 406 418 1244 $(Q)$ in the x-polarized mode parallel to the long axis of the elliptical cross-section can be explained by the fact that s-polarization has higher reflectivity for broader incidence angle to the DBR than p-polarization. The calculated $Q$ factors increases with the diameter of the cavity due to smaller spreading angles. This Fourier analysis of the micropillar cavity modes could be widely applied to optimize the cavities for high $Q$ and small $V$ .]]> 48 3 419 424 593 48 3 425 432 778 ${-}{rm 0.12}~{rm rad}$ phase offset and ${-}{rm 0.15}~{rm nm}$ BPF detuning at a bit rate of 10 Gb/s. We also investigated its effect via simulations by solving rate equations. The waveform and Q-factor of the wavelength converted signal were in good qualitative agreement with the experimental results. We studied the principle of the impact of both phase offset and BPF detuning on output signal improvement by a comparison of the optical spectrum of the wavelength converted output with that of the return-to-zero signal. Waveform improvement can be achieved by positioning the intensity of the two sidebands symmetrically on both sides of the carrier.]]> 48 3 433 439 721