photonics and nanotechnology, 2008, p.116

[...]... equation of a finite o square well In the calculation, the energy gap of InP and In0.53 Ga0.47 As are 1.35 eV and 0.73 eV respectively.6 The effective mass of electron (m∗ ) and hole (m∗ ) for In0.53 Ga0.47 As are 0.0416m0 and 0.46m0 respectively e hh The band discontinuity for conduction band, ∆Ec , and valence band, ∆EV , are 0.217 eV and 0.403 eV, Fig 1 PL spectra of In0.53 Ga0.47 As/InP single quantum... states in the well into barrier states 10 and thermal dissociation of excitons into free-electron-hole pairs.4 Because of very narrow well width, the subband energy of electron in conduction band and hole in valence band are closed to the top of the well The confined carriers can easily escape from the quantum wells Therefore the first quenching mechanism dominates and the small thermal activation energy... beam expander and beam reducer that causes enlarge optical size To improve the wavelength tunability, the high feedback fundamental power is required to reduce wavelength tolerance and suppress nearby wavelength By this technique, the high performance grating and high refection fundamental power are required 5 Conclusions In summary, using the single mode blue LD with flexible wavelength tunable and high-Q... characteristic and gain profile of the multimode Fabry-Perot blue LD This paper showed the sufficient of wavelength tunability and compactness comparing with the conventional excimer and YAG laser Moreover, this system has potential to focus and achieve the higher power density than bulk laser at the selected area Acknowledgment This research was supported by JST research foundation and NICHIA Corporation... separator and examples of operating fundamental wavelength stabilities 64.83 mW fundamental power was enhanced The SH tunability is 1.45 nm in range of 218.45 nm – 219.9 nm The 3-dB spectrum widths (∆λ) of 436.9 nm fundamental wave and 439.8 nm fundamental wave are 0.035 nm and 0.039 nm, respectively In addition, the extinction ratio of 436.9 nm fundamental wave and 439.8 nm fundamental wave are 24.10 dB and. .. mirror to reflect approximately 220 nm wave outside the SH cavity and maintain the fundamental wave inside the SH cavity In addition, to improve the fundamental feedback power, the transmission grating, which has the extinction ratio of 5% and 95% of 0th order and 1st order, and the 440 nm HR flat mirror were employed to reduce feedback loss and to enhance high-Q ECLD From this improvement, the maximum... Poisson and Schrdinger equations and in the well defined relationship between capacitance and density of sates The calculation results shoe that the presence of InN quantum dot will cause a negative differential capacitance which can evidence the position of quantum dots in the structures Also, our calculation results show that the negative differential capacitance is much higher at low temperature and for... cavity and OSA position in section 3.1, the wavelength separator (prism) should be located outside the SHG cavity Because of the polarizations of fundamental wavelength and SH wavelength differ by 90º, so a 220 nm dichroic mirror was employed to separate approximately 220 nm wave and approximately 440 nm wave In addition the feedback light in section 3.1 is only 60%, so a transmission grating and a... 218.25 nm – 220.1 nm The 3-dB ∆λ of 436.6 nm fundamental wave, 438.2 nm fundamental wave, and 440.2 nm fundamental wave are 0.040 nm, 0.039 nm, and 0.042 nm, respectively In addition, the extinction ratio of 436.6 nm fundamental wave, 438.2 nm fundamental wave, and 440.2 nm fundamental wave are 25.73 dB, 23.55 dB, and 29.47 dB, respectively This configuration can be improved by enhancing higher fundamental... detection and 0.34 µW backward detection Using bi-directional detection technique, an approximately 50% of SH power was obtained at backward detection, due to surface loss and scattering from 14 Fig 7 Symmetry configuration of SHG with external wavelength separator Fig 8 Experimental results of SHG at 448.9 nm and the variation of fundamental power vs fundamental wavelength fundamental wave, and 455.4 . Resolution 60 P. Phipithirankarn, P. Yabosdee and P. P. Yupapin Quantum Chaotic Signals Generation by a Nonlinear Micro Ring Resonator 65 C. Sripakdee, W. Suwancharoen and P. P. Yupapin Investigation. P. P. Yupapin, W. Suwancharoen, S. Chaiyasoonthorn and S. Thongmee An Alternative Optical Switch Using Mach Zehnder Interferometer and Two Ring Resonators 48 P. P. Yupapin, P. Saeung and P. . London WC2H 9HE Printed in Singapore. PHOTONICS AND NANOTECHNOLOGY Proceedings of the International Workshop and Conference on ICPN 2007 Benjamin - Photonics and Nanotechnology.pmd 10/31 /2008, 11:50