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Many trivalent rare earth ions, such as praseodymium (Pr), samarium (Sm), terbium (Tb) and dysprosium (Dy), have radiative transitions in the visible wavelength region, and those visible lasers have been reported [1]. Especially, Pr3+-doped lasers are successful so far as one of the most efficient approaches for visible lasing thanks to the development of indium gallium nitride (InGaN) diode lasers.
Pulsed operation characteristics of a high-power 1550 nm tapered distributed Bragg Reflector (DBR) laser diode are described. The development targets applications such as LIDAR and range finding, which require eye-safe, coherent light sources with a high peak-power. In particular, we employ a regrowth-free technique and AlGaInAs/InP gain structure, and demonstrate a peak power of about 1.6 W (drive-current...
GaAs diode laser-based hybrid micro-integration technology meets the demand for precision spectroscopy applications in space for compact, robust, and energy-efficient laser modules. It supports applications at wavelengths ranging from 630 nm to 1200 nm and is already used for quantum optics experiments in space [1].
Kerr optical frequency combs in high-Q microresonators [1] are attracting growing interest [23], especially after mode-locking via dissipative Kerr solitons (DKS) has been demonstrated on a variety of platforms [3, 4]. Such combs are a promising source for compact applications due to its potential advantages of low power consumption and possibility of chip integration. A traditional approach to obtaining...
High power diode lasers in the 9xx nm wavelength range are required for application in material processing, such as metal cutting and welding, either directly or as pump sources for solid state or fiber lasers. For example, continuous wave (CW) 1-cm diode laser bars are used for economic pumping of disk lasers [1] and continually improved optical output powers P, power conversion efficiency ηΕ = P/IV...
Titanium-doped AI2O3 (Ti:sapphire) laser can be directly pumped by recently developed green and blue indium gallium nitride (InGaN) laser diodes (LDs), and mode-locking operations of the laser with these pump sources have already been reported from several groups. Rohrbacher et al. achieved an average output power of 460 mW using two 2.9-W LDs at 450 nm, and a pulse width of 82 fs was obtained by...
Chemical bonds like H2O, CO, NH3, CO2 show characteristic fingerprints in the wavelength range between 1.9μm and 2.5μm. Sensor and monitoring technologies today especially for the internet of things require on the one hand light sources with low cost, low weight, low power consumption but on the other hand they should have a high brightness performance. The brightness of a diode laser is a measurement...
Diode lasers generating optical pulses with high peak power and pulse lengths in the pico- and nanosecond ranges are key components for a broad range of applications such as free-space communication, metrology, material processing, spectroscopy and LiDAR (Light Detection, and Ranging), e.g., for automotive systems (autonomous driving) and object detection [1, 2, 3, 4]. For automotive systems short...
Simulation and experimental investigation of the linewidth-power product of high power distributed feedback (DFB) diode lasers are presented. The reduction of linewidth-power product to 4.4 MHz.mW was observed for 780 nm DFB lasers.
Compact, cost and energy efficient diode lasers which generate short infrared pulses in the picosecond (ps) and sub-ps ranges are ideal pulse sources for many applications like e.g. THz-TDS scanning systems [1]. Using a passively driven diode laser with a colliding-pulse mode-locking (CPM) contact layout pulses below 10 ps can be generated [2]. This design contains a cavity centred saturable absorber...
Alexandrite, or chromium-doped chrysoberyl (Cr3+·. BeAl2O4), is known to be the first tunable laser crystal directly diode-pumped at room temperature (1979 Wallin et al [1]). Such lasers are used for medical application (especially dermatology), material processing and Lidar systems. Large absorption coefficients around 410 nm and 590 nm and long room temperature fluorescence lifetime (260 μs) enable...
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