We demonstrate the improved purity of the emission spectra of a Yb3+-doped Y3Al5O12 laser with resonant grating mirrors. When the two mirrors’ principal axes are twisted, both multiple longitudinal mode emission and dual polarization emission are suppressed. The proposed design enables a compact single mode laser, replacing more complex designs usually needed to achieve that goal.
Two laser mirrors with a Bragg mirrors and diffraction grating were designed to achieve single-mode emission. At normal incidence, the reflected transverse electric (TE) and transverse magnetic (TM) polarized beams exhibit a phase difference near π and, in the case of the output coupler, a difference in the reflected amplitude. Laser mirrors with suitably adjusted di-attenuation and di-retardance can be used to achieve single-mode emission of a microchip laser without additional intracavity elements by canceling axial hole burning and suppressing the undesired competing polarization eigenstate. An integrated microchip laser design is also presented to support the potential of delivering a monolithic and compact solution for single-mode emission.
A method of hybrid integration of quantum dot microdisk lasers with silicon wafer is proposed and realized. In addition to the possibility of combining microlasers with various silicon-based electronic and photonic devices, this makes it possible to significantly improve heat removal from the active region of the microlaser. The thermal resistance normalized to the mesa area reaches the level of about 0.002 (K/W)*cm2, which is significantly lower than the corresponding values of QD microlasers on GaAs substrate and monolithically grown on Si. As a result, the threshold current as well as current-induced shift of emission wavelength are reduced in continuous-wave regime.
Lasers based on semiconductor whispering gallery mode (WGM) resonators represent a perfect platform for active small footprint high-sensitive devices for biodetection. Biochemical samples typically require aqueous solution, and the resonator should be placed into a cuvette with water or in a microfluidic chip. The characteristics of modern semiconductor WGM lasers with an active region based on InAs/InGaAs quantum dots (QDs) make them promising for creating compact highly sensitive devices for biodetection. Deep localization of carriers in InAs/InGaAs QDs and suppressed lateral migration helps us to obtain room-temperature lasing in microdisk lasers immersed in an aqueous medium. In this work, we studied the sensitivity of the microdisk laser resonance spectral position to the refractive index of the surrounding material by changing the salinity of the water solution. We also successfully detected model proteins (secondary antibodies attached to the microdisk surface) via measurement of the lasing threshold power. The proteinprotein interaction on the microdisk surface manifests itself by an increase in the laser threshold power. Thus, in this work we demonstrated, for the first time, the possibility of using QD semiconductor microdisk lasers for detection of proteins in a microfluidic device.
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