摘要:
Die Erfindung betrifft einen Lichtwellenleiter (3) als Lasermedium oder Verstärkermedium für den Hochleistungsbetrieb, wobei der Lichtwellenleiter (3) eine optische Faser ist, deren Licht führender Kern zumindest bereichsweise mit Seltenerdionen dotiert ist. Aufgabe der Erfindung ist, einen Lichtwellenleiter als Laser- oder Verstärkermedium sowie eine damit realisierte Laser/Verstärker- Kombination bereit zu stellen, bei der das Ausgangsignal des Laser- oder Verstärkermediums besser stabilisiert ist. Diese Aufgabe löst die Erfindung dadurch, dass die maximale Kleinsignalverstärkung des Lichtwellenleiters (1) aufgrund der Konzentration der Seltenerdionen und/oder deren Verteilung in dem Licht führenden Kern bis zu 60 d B, vorzugsweise bis zu 50 d B, weiter bevorzugt bis zu 40 d B, besonders bevorzugt bis zu 30 d B beträgt. Des Weiteren betrifft die Erfindung die Verwendung eines solchen Lichtwellenleiters als Verstärkerfaser (3) in einer Laser/Verstärker-Kombination.
摘要:
An optical parametric oscillator (3) is configured to provide first ultrashort output pulses comprising light of a first wavelength and second ultrashort output pulses comprising light of a second wavelength, wherein at least one of the first and second wavelengths is independently controllable. The optical parametric oscillator (3) comprises an optical resonator (10) containing first and second nonlinear optical elements (11, 12) and comprising an output coupler (13), an input system (14) configured to provide first pump pulses to the first nonlinear optical element (11) and second pump pulses to the second nonlinear optical element (12), and a control system (15).
摘要:
High power lasers and high power laser systems that provide high power laser beams having preselected wavelengths and characteristics to optimize or enhance laser beam performance in predetermined environments, conditions and use requirements. In particular, lasers, methods and systems that relate to, among other things, Raman lasers, up conversion lasers, wavelength conversion laser systems, and multi-laser systems that are configured to match and create specific and predetermined wavelengths at specific points along an optical path having varying requirements along that path.
摘要:
The present invention relates to compact, low noise, ultra-short pulse sources based on fiber amplifiers, and various applications thereof. At least one implementation includes an optical amplification system having a fiber laser seed source producing seed pulses at a repetition rate corresponding to the fiber laser cavity round trip time. A nonlinear pulse transformer, comprising a fiber length greater than about 10 m, receives a seed pulse at its input and produces a spectrally broadened output pulse at its output, the output pulse having a spectral bandwidth which is more than 1.5 times a spectral bandwidth of a seed pulse. A fiber power amplifier receives and amplifies spectrally broadened output pulses. A pulse compressor is configured to temporally compress spectrally broadened pulses amplified by said power amplifier. Applications include micro-machining, ophthalmology, molecular desorption or ionization, mass-spectroscopy, and/or laser- based, biological tissue processing.
摘要:
A side pump fiber and a method of making a side pump fiber are provided. A plurality of pump fibers can be joined to a side of a signal fiber, at different locations. The method includes creating a lengthwise, tapered, concave pocket cut in a pump (or side pump) fiber, inserting the signal fiber in the pocket cut, and then coupling the side pump fiber to the center fiber at the pocket cut. Optical amplifiers and lasers, as examples, can be made using the above method and side pump fibers.
摘要:
The present invention relates generally to optical waveguides for the transmission of electromagnetic energy. The present invention relates more particularly to optical fibers, optical fiber devices, and methods that can be used to remove cladding-propagating energy from a system. One embodiment of the invention is a rough-clad optical fiber section having a first end and a second end, the optical fiber section comprising a core a glass cladding disposed about the core, the cladding having an outer surface having an rms surface roughness of at least about 100 nm, the outer surface not being immediately surrounded by polymer layer.
摘要:
A laser illuminator and illumination method for use in an inspection system, such as a semiconductor wafer inspection system or photomask inspection system is provided. The design comprises generating fundamental frequency laser energy at different fundamental wavelengths, such as 998nm, converting a portion of the fundamental frequency laser energy to 2nd harmonic frequency laser energy, further converting the 2" harmonic frequency laser energy to 4th harmonic frequency laser energy, and mixing the 4th harmonic frequency laser energy with a portion of the fundamental frequency laser energy to produce laser energy at a sum frequency. Mixing is accomplished by non-critical phase matching in a crystal of Cesium Lithium Borate (CLBO). Alternately, the design may employ shifting a portion of the fundamental frequency laser energy to laser energy at a Raman line and/or mixing the 2nd harmonic frequency laser energy with a portion of the fundamental frequency laser energy to produce 3rd harmonic frequency laser energy.