We report on a low-noise diode laser system for coherent precision spectroscopy of individual ro-vibrational molecular states. A 10 fold reduction of frequency-noise of our diode laser with respect to grating stabilized diode lasers is presented.
We propose a nano-laser utilizing a cylindrical bowtie cavity. The low threshold current and nanometer-scale confinement of the lasing mode are achievable due to the field enhancement from plasmonic and curvature effects of bowtie tips.
A simple fused silica light-guide assembly transmits 6 W concentrated solar power to a 2D-CPC cavity. The calculated laser power of 75.8 W is obtained for a 4 mm diameter Nd:YAG rod, reaching the conversion efficiency of 11W/m2.
Tuned by a variable reflective mirror, we achieve 71.2-W free-running and 30-W maximum average power in range of 1866-2107 nm in Tm-doped fiber lasers. Watt-level powers are generated from single crystal and ceramic Cr2+:ZnSe disk lasers.
We report the characteristics of a wavelength swept laser with a scanning fiber Fabry-Perot filter in the 1300 nm. We investigate the dependence of the scanning frequencies of the conventional and Fourier domain mode-locked (FDML) wavelength swept laser. In the FDML swept laser, the transient intensity profiles and the tuning bandwidths were investigated according to the injection currents and detuning...
CW operation is achieved in novel semiconductor ring lasers based on retro-reflector cavities with parabolic mirrors downsized to equivalent ring radius of 16mum at room temperature. L-I curves and optical spectra are observed.
Rectangular ring lasers based on an active vertical coupler structure are fabricated through asymmetric double shallow ridge and ICP/ICP cascade etching. 25% reduction of Ith and the single mode operation with SMSR 23dB are achieved.
We propose and demonstrate a modelocked bi-directional VECSEL with a double V cavity configuration. The laser generates 1.04 mum optical pulses with a 0.76 GHz repetition rate and a total average output power of 4 mW.
We present a detailed characterization of the semiconductor ring-laser operating regimes with special emphasis on the response to optical injection. Applications to an optical set/reset bistable memory and four-wave-mixing tunable THz signals generation are demonstrated.
We demonstrate adjustable chirp of directly-modulated injection-locked VCSELs at 10-Gbps resulting from a novel data pattern inversion phenomenon, which leads to chromatic dispersion compensation and a 10X distance increase over standard single-mode fiber.
The integration of photonic crystal (PC) resonators into the active region of terahertz quantum cascade lasers emitting around 2.7 THz is presented. The PC acts as frequency selective mirror and allows the tuning of the emission frequency throughout the entire gain region of the active zone. The PC and the gain region are embedded in a double-metal wave guide.
We have developed a cw 5-W 756-nm injection-locked Ti:sapphire laser and generated 1.1-W 378-nm radiation by its frequency-doubling in an external enhancement cavity, which is useful for the selective optical pumping of thalium isotopes.
We study the spectral characteristics of spiral-shaped micro-cylindrical quantum cascade lasers with various spiral geometries. With medium deformations and notch angles, our lasers can achieve single-mode emission with a side-mode suppression ratio over 30 dB.
We demonstrate a scalable approach for the generation of high average power fs pulse trains by optically injection locking an amplification cavity. Initial results generated 4.7 Watts average power and 70 fs pulses.
We present an injection locked single-frequency laser with an asymmetric resonator for transversal mode control. To characterize the laser at the operation point the TEM00 mode content was measured in respect to the pump power.
Excitation mechanisms and requirements on materials, and pump sources for crystalline up-conversion lasers will be discussed. Using suitable pump- and resonator arrangements significant improvement of existing results concerning room temperature up-conversion lasers could be achieved.
Fabry-Perot cavity filtering of broadband optical frequency combs is studied experimentally and theoretically. Effects of dispersion, mirror coatings, and carrier envelope offset frequency are analyzed while highlighting applications to waveform generation and spectroscopic references.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.