Scott Buchter - Academia.edu (original) (raw)
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A long wavelength infrared laser system is disclosed where radiation from laser sources such as f... more A long wavelength infrared laser system is disclosed where radiation from laser sources such as frequency-doubled Nd:YAG or a Cr:LiSAF is used to resonantly pump a gain medium consisting of a holmium-doped fluoride crystal having a high active ion concentration. The laser pump source has a pulse duration that may be short enough to gain switch a particular transition or long enough to allow end-pumping with high energy densities without damage. The gain material has an absorption approximately resonant with the pump source wavelength, and the dopant concentration is selected to maximize absorption strength for a given excitation. The output radiation from the laser system consists of one or more wavelengths including, in particular 3.9 nm but also other infrared wavelgths such as 1.4 µm, 2.9 µm and 3.4 µm., several of which may be produced simultaneousely from the same laser material through the mechanism of cascade transitions.
In microstructured optical fibers (MOFs) narrow-band light can very efficiently be transformed in... more In microstructured optical fibers (MOFs) narrow-band light can very efficiently be transformed into extremely broadband light by the complex interplay of nonlinear optical phenomena. Thanks to the flexibility in the design of the disp ersion properties and the achievable high nonlinearity offered by MOFs the interest in experimental and theoretical research on supercontinuum generation has boosted in recent years. Independent of the pump laser source employed, the generated supercontinuum light is temporally not constant, but is rather confined in high peak power pulses or s oliton-like structures. This limits their use for applications that require broadband bu t temporally-stable light and that are sensitive to high peak powers. Here, we present a new concept for a simple fiber-based superc ontinuum light source emitting with tailored spectral properties true continuou s-wave light at a power stability of below 1% [1]. The principle of the light source is based on a standard pulse...
Journal of the European Optical Society: Rapid Publications, 2008
We report on a compact UV-laser with a short pulse length of 1.9 ns at 236 nm. A passively Q-swit... more We report on a compact UV-laser with a short pulse length of 1.9 ns at 236 nm. A passively Q-switched quasi-three-level Nd:YAG laser at 946 nm acts as the pump source. UV pulses are produced by two consecutive single-pass frequency doubling events, the first one from IR to blue with a BIBO crystal and the second one from blue to deep-UV with a β-BBO crystal. Conversion efficiency from 946 nm to 473 nm is 28% and from blue to UV 7%. Average power for UV is 7.6 mW with a energy and peak power of 230 nJ, and 120 W respectively.
We demonstrate the feasibility of monolithic crystal assembly (MCA) lasers as excitation sources ... more We demonstrate the feasibility of monolithic crystal assembly (MCA) lasers as excitation sources in an extremely compact microspectroscopy system for material analysis. The diode pumped MCA laser uses Nd:YVO4 and KTP to efficiently generate 532 nm radiation via resonant second harmonic generation. We present Raman spectra of solid state materials and protein solutions with spatial resolution in the micron range
A long wavelength infrared laser system is disclosed where radiation from laser sources such as f... more A long wavelength infrared laser system is disclosed where radiation from laser sources such as frequency-doubled Nd:YAG or a Cr:LiSAF is used to resonantly pump a gain medium consisting of a holmium-doped fluoride crystal having a high active ion concentration. The laser pump source has a pulse duration that may be short enough to gain switch a particular transition or long enough to allow end-pumping with high energy densities without damage. The gain material has an absorption approximately resonant with the pump source wavelength, and the dopant concentration is selected to maximize absorption strength for a given excitation. The output radiation from the laser system consists of one or more wavelengths including, in particular 3.9 nm but also other infrared wavelgths such as 1.4 µm, 2.9 µm and 3.4 µm., several of which may be produced simultaneousely from the same laser material through the mechanism of cascade transitions.
In microstructured optical fibers (MOFs) narrow-band light can very efficiently be transformed in... more In microstructured optical fibers (MOFs) narrow-band light can very efficiently be transformed into extremely broadband light by the complex interplay of nonlinear optical phenomena. Thanks to the flexibility in the design of the disp ersion properties and the achievable high nonlinearity offered by MOFs the interest in experimental and theoretical research on supercontinuum generation has boosted in recent years. Independent of the pump laser source employed, the generated supercontinuum light is temporally not constant, but is rather confined in high peak power pulses or s oliton-like structures. This limits their use for applications that require broadband bu t temporally-stable light and that are sensitive to high peak powers. Here, we present a new concept for a simple fiber-based superc ontinuum light source emitting with tailored spectral properties true continuou s-wave light at a power stability of below 1% [1]. The principle of the light source is based on a standard pulse...
Journal of the European Optical Society: Rapid Publications, 2008
We report on a compact UV-laser with a short pulse length of 1.9 ns at 236 nm. A passively Q-swit... more We report on a compact UV-laser with a short pulse length of 1.9 ns at 236 nm. A passively Q-switched quasi-three-level Nd:YAG laser at 946 nm acts as the pump source. UV pulses are produced by two consecutive single-pass frequency doubling events, the first one from IR to blue with a BIBO crystal and the second one from blue to deep-UV with a β-BBO crystal. Conversion efficiency from 946 nm to 473 nm is 28% and from blue to UV 7%. Average power for UV is 7.6 mW with a energy and peak power of 230 nJ, and 120 W respectively.
We demonstrate the feasibility of monolithic crystal assembly (MCA) lasers as excitation sources ... more We demonstrate the feasibility of monolithic crystal assembly (MCA) lasers as excitation sources in an extremely compact microspectroscopy system for material analysis. The diode pumped MCA laser uses Nd:YVO4 and KTP to efficiently generate 532 nm radiation via resonant second harmonic generation. We present Raman spectra of solid state materials and protein solutions with spatial resolution in the micron range