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Stable and spectrally narrow laser sources referenced to ultrastable passive Fabry-Pérot cavities are invaluable for optical atomic clocks and they find important applications, e.g. in precision tests of relativity or novel radar applications. Ultimately the fractional frequency instability of the laser is limited by Brownian thermal noise of the cavity constituents.
Quantum cascade lasers (QCLs) are unipolar semiconductor devices emitting in the mid-and far-infrared spectral ranges. Due to their relatively narrow linewidths and short gain recovery times, these lasers have been deemed difficult, if not impossible, to passively mode lock (PML) [1, 2]. However, the successful mode locking of QCLs is of utmost importance as it could allow generation of ultrashort...
We experimentally and theoretically examined the mode structure of half-disk lasers fabricated by cleaving whispering gallery mode (WGM)-disk lasers. The WGM lasers with a radii R of 50–150 μm emitting near 2.2 μm were fabricated using the GaSb-based quantum well structure [1]. The cleavage usually passes not through the centre of the disk with the deviation δ/R up to 20 % (Fig. 1a). Recently we have...
Application of active disks reduces thermally induced optical effects in powerful solid-state lasers significantly [1]. The next step to improve the quality of output laser emission together with increasing of the output power may be done while using multi beam pumping and degenerate laser cavity configuration [2]. The resonator should be designed to cover in series of all the pumped areas in the...
Q-switched lasers operating in the nominally eye-safe 2 μm wavelength region are important for applications such as material processing, medicine, LIDAR systems, and pumping of optical parametric oscillators based on ZnGeP2 or periodically poled GaAs. Many of these benefit from wavelengths above 2.05 μm, which are not accessible by the actually widely used Tm-lasers. The long upper laser level lifetime...
In optomechanical systems, co-localizing light and mechanical oscillations at the nanoscale can lead to strong interaction between photons and phonons. Such optomechanical coupling enables sensitive detection of nanoscale motion, as well as control of the motion through optical forces down to the quantum level [1]. In the vast majority of cases, the optomechanical coupling can be regarded as linear...
Strong light-matter coupling has been recently successfully explored in the GHz and THz [1] range with on-chip platforms. New and intriguing quantum optical phenomena have been predicted in the ultrastrong coupling regime [2], when the coupling strength Ω becomes comparable to the unperturbed frequency of the system ω. We recently proposed a new experimental platform where we couple the inter-Landau...
The development of atom interferometry in the last few decades has led to high precision measurements of inertial effects and tests of fundamental physics [1]. New methods for higher sensitivity atom interferometers (AIs) are being explored, in particular the interrogation of atoms with optical cavities. The benefits of optical cavities would be higher optical power allowing large momentum transfer...
Cooling of nanomechanical resonators to their motional ground state [1, 2] triggered recent achievements like non-classical mechanical state preparation [3] or coherent optical to microwave photon conversion [4]. Implementations of such system with optomechanical crystal (OMC) resonators use the co-localization of optical and acoustic modes in a periodically patterned device layer of a silicon-on-insulator...
Monolayer Transition Metal Dichalcogenides (TMDs) have recently attracted great interest in the field of photonics because of their distinctive optical and spin properties. In contrast to bulk TMD materials, which are indirect bandgap semiconductors, monolayer TMDs are highly optically active due to a direct bandgap ranging between 1 and 2 eV [1]. The coupling of TMD excitons to optical fields can...
Over the past decade high-resolution and broadband spectroscopy has received a major boost from the advent of optical frequency combs (OFCs) [1, 2]. Direct frequency comb spectroscopy (DFCS) exploits high-speed multiplexing approaches in order to simultaneously detect a massive set of extremely accurate channels, allowing for ultra-broadband and high speed spectroscopic investigations [3, 4]. Here...
Numerical methods can be useful for the understanding of high-Q resonators, the interpretation of frequency comb formation and the tailoring of nonlinear phenomena. For specific applications like telecommunications or low phase noise microwave generation, a phase locked frequency comb or temporal pulse train is critical. Single intra-cavity dissipative temporal solitons have demonstrated to be attractive...
Cavities utilizing high-finesse optical resonators provide effective pathlength of several kilometers for light-matter interaction[1]. However as compared to near-IR wavelength region, in the mid-IR region absorption measurements lack high sensitivity due to the combination of highly reflective mirrors and lower detectivity of detectors [2]. To enhance sensitivity beyond the optical effective path...
The recently-introduced use of integrated frequency combs (on-chip light sources with a broad spectrum of evenly-spaced frequency modes, generated by four-wave mixing in optically-excited nonlinear microcavities) below optical parametric oscillation threshold for quantum state generation has provided a solution for scalable and multi-mode quantum sources [1, 2]. Pulsed quantum frequency combs, in...
Localized structures (LSs) in optical resonators have attracted much interest in the last twenty years. While LSs are ubiquitous in nature and their investigation conveys an intrinsic fundamental appeal, optical LSs are very attractive also for applications. Because they can be individually addressed and manipulated, LSs can be used as elementary bits of information for all-optical information processing...
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