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We present a diode laser concept for precision spectroscopy which is based on a novel optical feedback scheme that combines excellent frequency stability (< 35 kHz line width in 290 ms) with good tuneability (45 GHz continuously, 50 nm overall).
The generation of top-hat light fields and lines by micro-optics is reviewed. Customized beam shapes can be generated by free-form micro-optics. Thus, the beam profile can be tuned to achieve best process parameters in laser-based FPD production.
Dicke narrowing dominates over collisional dephasing in gas phase H2 up to 500 Torr, permitting the efficient production of a record 70,000 cm-1 broad Raman sideband spectrum by molecular modulation at room temperature.
Multimode operation of an optical parametric oscillator operating below threshold is calculated. We show that maximal squeezing can be obtained at high frequency even in the presence of seed laser noise and cavity length fluctuations.
A practically tunable multiwavelength Raman fiber laser based on few-mode fiber Bragg gratings with dynamic range of more than 15 nm is investigated. We achieved a high extinction ratio of more than 45 dB.
Design and simulation are presented for a high-temperature intersubband Raman laser based on GaN/AlGaN coupled quantum wells. This laser is tunable over 3.6~5.2 mum by applying an electric field at a fixed pumping wavelength of 2.7 mum.
A synchronously pumped, fs-OPO with automated tuning in combination with an optimized scanner / microscope / detection system is used for MPE- and SHG microscopy on biological samples. The system and first results are presented.
We realized a wavelength-tunable mode-locked fiber laser using intracavity dispersion. Continuous tuning over 100 nm was obtained at a sweep rate of 20 kHz. Discrete tuning was achieved over 39 nm by inserting a FFPI into the cavity.
Tunable few-cycle laser pulses in the visible spectrum are efficiently generated by four wave mixing process during the filamentation in air. The mode quality and energy stability were exceptional.
We demonstrate a muW-level broadly tunable THz source based on parametric down-conversion in orientation-patterned GaAs pumped by femtosecond pulses from a Tm-doped fiber laser. Generated THz powers should be scalable to mW-levels with this approach.
An inhomogenous quantum-cascade structure based on two bound-to-continuum designs was used as gain element in a grating-coupled external cavity laser. This laser was tunable from 8.2 to 10.4 mum in pulsed mode on a thermoelectric cooler.
We demonstrate tunable semiconductor lasers based on three coupled photonic crystal sections, that allows up to 18 nm tuning range with a side-mode suppression ratio greater than 35 dB.
The design and fabrication of quantum cascade photonic crystal surface emitting lasers in the mid infrared for intra-cavity spectroscopy and integration with microfluidic delivery is presented.
A light source using sum-frequency generation is developed for the ytterbium clock transition at 578 nm. Doppler-free spectroscopy of iodine lines near the Yb clock transition and frequency stabilization are demonstrated with the light source.
The development of a high-power diode-pumped continuous-wave Yb:KGW laser is reported. The laser delivered 6 W of average power at 1049 nm and was tunable between 1035 and 1076 nm with more than 1.3 W of output power.
Widely wavelength-tunable ultrashort pulses are generated using passively modelocked Yb-doped fiber laser and photonic crystal fiber. Soliton and anti-stokes pulses are generated in wavelength region of 1.0-1.7 mum and 0.6-0.7 mum, respectively.
Current challenges in CARS microscopy lie in pushing the sensitivity limit, together with designing turnkey set-ups based on high power, broadly tunable lasers. We have moved one step forward in each of these two directions.
The use of the 1.3 line and third harmonic of the diode pumped Nd:YAG laser provides a variety of new methods to address the continued advance towards smaller, lighter more complex microelectronics.
A tunable photonic crystal laser based on two coupled cavities was integrated with a wavelength monitor. The monitor is based on a compact, multimode photonic crystal waveguide together with a photodiode.
Large wavelength tuning of a double ring resonator coupled laser is demonstrated. The 20 different modes spreading in 17 nm range have a maximum output power of 1.2 mW, and a side mode suppression of about 30 dB.
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