Utilizing a tunable photonic crystal resonant reflector as a mirror of an external cavity laser cavity, we demonstrate a new type of label-free optical biosensor that achieves a high quality factor through the process of stimulated emission, while at the same time providing high sensitivity and large dynamic range. The photonic crystal is fabricated inexpensively from plastic materials, and its...

A semiconductor laser is often considered as an optical gain medium inside a Fabry-Perot resonant cavity. Lasing emission into cavity modes requires that photons experience at least one round trip within the resonator. A natural question concerns the effect multiple round trips in the resonator (i.e., cavity formation) has on temporal evolution of lasing light intensity and spectra. Under norma...

Ahstruct-We preseni a formalism for analyzing laser resonators which possdss nonplanar mirrors and iateral waveguiding [e.g., an unstable resonator semiconductor laser (URSL)]. The electric field is expdnded iii lateral modes of the complex-iridex waveguide and is required to rbproduce itself after, one roundtrip of the cavity. We show how the waveguide modes, their gain and loss, and hence the...

We report on a simple method of locking a laser to a birefringent cavity using polarization spectroscopy. The birefringence of the resonator permits the simple extraction of an error signal by using one polarization state as a phase reference for another state. No modulation of the light or the resonator is required, reducing the complexity of the laser locking setup. This method of producing a...

We study the continuous-wave (cw) operation of a semiconductor laser subject to optical feedback from a Fabry-Perot resonator in a case where the emission is resonant to a reflection minimum of the resonator. This configuration is treated in the framework of Lang-Kobayashi equations. The nature of bifurcations and the stability of steady state solutions is analyzed in terms of the dependence on...

The amplitude of the photoacoustic effect for an optical source moving at the sound speed in a one-dimensional geometry increases linearly in time without bound in the linear acoustic regime. Here, use of this principle is described for trace detection of gases, using two frequency-shifted beams from a CO2 laser directed at an angle to each other to give optical fringes that move at the sound s...

The performances of a fiber laser stabilized by whispering-gallery-mode(WGM) resonator depends heavily on the coupling and system, is labile due to lasing mode competitions among excitable WGMs. Here, we propose hybrid cavity where linear coupled WGM for dual stabilizations mode, experimentally demonstrate single-mode emission with stable high signal noise ratio (up 61 dB), narrow linewidth (lo...

We present a laterally emitting, coupled cavity micro fluidic dye ring laser, suitable for integration into lab-on-a-chip micro systems. The micro-fluidic laser has been successfully designed, fabricated, characterized and modelled. The resonator is formed by a micro-fluidic channel bounded by two isosceles triangle mirrors. The micro-fluidic laser structure is defined using photo lithography i...