Results 251 to 260 of about 8,929 (287)

Solgel grating waveguides for distributed Bragg reflector lasers

Optics Letters, 1999
Solgel grating waveguides and their application to the fabrication of external-cavity distributed Bragg reflector (DBR) lasers are demonstrated. A new composition of aluminosilicate material is developed for the fabrication of single-mode waveguides and Bragg reflectors. An average loss of
M A, Fardad, H, Luo, Y, Beregovski, M, Fallahi   +3 more
openaire   +2 more sources

Distributed Bragg reflector lasers emitting around 2.3μm

Fourth International Conference on Photonics and Optical Engineering, 2021
We report on successful fabrication of GaSb-based type-I quantum well distributed Bragg reflector (DBR) lasers emitting around 2.3μm. Second-order Bragg gratings of chromium were patterned by electron beam lithography. For 1.5-mm-long laser diode, single mode continuous-wave operation with output power of 10mW is obtained.
Cheng-Ao Yang, Yi Zhang, Jin-Ming Shang, Yi-Hang Chen, Tian-Fang Wang, Xiang-Bin Su, Sen-Sen Li, Hai-Qiao Ni, Yu Zhang, Ying-Qiang Xu, Zhi-Chuan Niu   +10 more
openaire   +1 more source

High-reflectivity ultraviolet AlGaN∕AlGaN distributed Bragg reflectors

Applied Physics Letters, 2006
We demonstrate high-reflectivity crack-free Al0.18Ga0.82N∕Al0.8Ga0.2N distributed Bragg reflectors (DBR) for the spectral region around 350nm grown by molecular-beam epitaxy on thick GaN templates. The structural quality of the DBR layers is maintained by compensating the compressive and tensile stress in each λ∕4 pair.
Mitrofanov, Oleg, Schmult, Stefan, Manfra, Michael J., Siegrist, Theo M., Weimann, Nils, Sergent, Arthur Michael, Molnar, Richard J.   +6 more
openaire   +1 more source

High q-factor distributed bragg reflector resonators with reflectors of arbitrary thickness

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2007
The Bragg reflection technique improves the Q-factor of a resonator by reducing conductor and dielectric losses. This is achieved by designing a low-loss inner resonant region (usually free space) surrounded by an outer anti-resonant region made of distributed Bragg reflector layers.
Le Floch, Jean-Michel, Tobar, M.E., Cros, Dominique, Krupka, J.   +3 more
openaire   +3 more sources

Distributed Bragg Reflector Laser

2018
A laser consisting of a distributed-Bragg-reflector (DBR) having a strong wavelength selection mechanism in its reflectivity due to periodicity in the refractive index of the waveguide or the resonator, is called as a DBR laser. A laser consisting of a periodic structure on an active region is called a distributed feedback (DFB) laser, in which ...
openaire   +1 more source

Saturable optical resonators with distributed Bragg-reflectors

Optics Communications, 1976
Abstract Saturable optical resonators with distributed Bragg reflectors are analyzed by using the mode coupling theory. Hysteresis and nonlinear characteristics are given as a function of the absorption coefficient, the length of the absorber region, and the coupling coefficient of the corrugated waveguide.
Masahiro Okuda, Masafumi Toyota, Kiyoshi Onaka   +2 more
openaire   +1 more source

Athermal Hollow Waveguide Distributed Bragg Reflector Laser

CLEO:2011 - Laser Applications to Photonic Applications, 2011
We demonstrate athermal hollow-waveguide distributed Bragg reflector lasers using a hybrid-integration approach. The lasing wavelength can be locked within a longitudinal mode spacing (0.3nm) over temperature range of 15K. A design of mode-hop-free athermal operations is presented.
Hideaki Yamakawa, Naomi Tadokoro, Takahiro Sakaguchi, Yoshihisa Tokunaga, Fumio Koyama   +4 more
openaire   +1 more source

Switching characteristics of distributed Bragg reflector lasers

[Proceedings] Singapore ICCS/ISITA `92, 1992
This paper presents numerical results concerning wavelength switching of multisection DBR lasers. The static tuning characteristics and the dynamic behavior of the switching between different longitudinal modes is investigated. The influence of hysteresis in the frequency versus grating current characteristics on the forward and backward switching time
S. Benedetto, I. Montrosset, P. Ottolenghi   +2 more
openaire   +1 more source

Tunable multilayer-film distributed-Bragg-reflector filter

Journal of Applied Physics, 1979
The periodic multilayers of dielectric materials such as polystyrene/collodion or polystyrene/polyvinyl alcohol were fabricated by means of alternately dropping these solutions onto a spinner. As these materials are slightly elastic, a large shift of the center of the Bragg reflection by 650 Å toward shorter wavelength is obtained by the compression of
Mitsuteru Kimura, Kazuaki Okahara, Toshihiko Miyamoto   +2 more
openaire   +1 more source

Analysis of Distributed Bragg-Reflector Laser Amplifiers

Japanese Journal of Applied Physics, 1977
Laser amplifiers with distributed Bragg-reflectors are analyzed to obtain the transmission gain and the linewidth by using the coupled-mode equation. Compared with the distributed feedback (DFB) laser amplifiers, the distributed Bragg-reflector (DBR) laser amplifiers have an advantage that the transmission gain and the linewidth are controlled by the ...
Masahiro Okuda, Kiyoshi Onaka
openaire   +1 more source