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A real-time resonance tracking method is described and experimentally demonstrated in controlling an injection-seeded Q-switched Nd:YAG laser for stable single-axial-mode operation. Noise insensitive single axial mode with 100% recurrence is achieved with mW seeding power.
We propose and experimentally demonstrate new beam solutions in form of azimuthally symmetric higher-order Bessel-Gauss beams. We experimentally observe these beams as higher-order eigenmodes in optical resonators consisting of aspheric mirrors.
We present an Yb:YAG modelocked thin-disk laser with a record-high average output power of 275 W, a pulse duration of 583 fs and a pulse energy of 16.9 μJ. Furthermore, we present first experiments towards higher pulse energies.
A violet multi-mode diode laser and cavity ring-down spectroscopy were used to detect trace amounts of NO2. The laser excites multiple cavity modes, simplifying the detector alignment and making it less susceptible to vibration.
We theoretically incorporate chirality into laser cavities and utilize it to demonstrate circularly-polarized resonant modes. In absence of extrinsic magnetism, these modes may induce a net spin polarization via selection rules when lasing.
The gain-induced mode pulling in terahertz quantum cascade lasers is measured and then modified using an aperiodic photonic lattice, providing a complex multi-band filter response, integrated within the Fabry-Pérot cavity.
We demonstrated a dual-mode external cavity laser biosensor, and developed a self-referencing technique utilizing one of the two lasing modes as reference signal. This system achieves high-Q resonance, high sensitivity label-free detection and eliminates common-mode sources of sensor noise.
The one-dimensional resonant cavity is formed by contacting a curved microfiber to the dual-rail nanobeam. Experimentally we measure the spontaneous emission factor of the nanobeam laser of 0.16 and fiber-coupling efficiency of 30%.
We report room-temperature lasing in a photonic crystal nanobeam cavity. The electrical current pulse is injected through a central post placed underneath the nanobeam. Lasing action is observed at a wavelength of ∼1470 nm with a threshold current of ∼ 9μA.
We propose a novel laser cavity based on imaginary-frequency resonance splitting in coupled resonators. Using different free-spectral ranges (FSRs), a Vernier-like effect where only one longitudinal mode lases allows for ultra-wide tuning of single-frequency lasers.
Two separate contacts are incorporated into the different arms of Quantum Cascade lasers with asymmetric Mach-Zehnder interferometer type cavities. Preliminary results reveal an almost-continuous single mode tuning range of 20 cm−1 at 80K.
We report multi-color visible light generation from photonic crystal nanocavity lasers exhibiting broadband quantum dot gain in the near infrared. The visible emission is produced though self-frequency doubling, which efficiently occurs within the high Q nanocavities.
We describe the development of a widely and continuously tunable, mode-hop-free External Cavity QCL for the detection of medically relevant molecules. Several key issues are implemented to achieve fast detection and high spectral resolution.
A novel technique for beam quality improvement of a broad-area diode array has been demonstrated. For each emitter, the fast-axis mode is imaged back onto the slow axis, improving beam quality while preserving slope efficiency.
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