Passive intrinsic-linewidth narrowing of ultraviolet extended-cavity diode laser by weak optical feedback.
... the other hand have typical linewidths of a few hundred kHz to a few MHz, with shorterwavelength systems generally on the broader end [2]. Numerous schemes exist for narrowing their linewidth. Optical feedback from a resonator [3] can be used to reduce the linewidth of an ECDL, and recent systems [4 ...
... the other hand have typical linewidths of a few hundred kHz to a few MHz, with shorterwavelength systems generally on the broader end [2]. Numerous schemes exist for narrowing their linewidth. Optical feedback from a resonator [3] can be used to reduce the linewidth of an ECDL, and recent systems [4 ...
Passive intrinsic-linewidth narrowing of ultraviolet extended-cavity diode laser by weak optical feedback
... the other hand have typical linewidths of a few hundred kHz to a few MHz, with shorterwavelength systems generally on the broader end [2]. Numerous schemes exist for narrowing their linewidth. Optical feedback from a resonator [3] can be used to reduce the linewidth of an ECDL, and recent systems [4 ...
... the other hand have typical linewidths of a few hundred kHz to a few MHz, with shorterwavelength systems generally on the broader end [2]. Numerous schemes exist for narrowing their linewidth. Optical feedback from a resonator [3] can be used to reduce the linewidth of an ECDL, and recent systems [4 ...
High spatial resolution performance of a triple Fabry–Pérot filtergraph
... within the channeled spectrum. Several filtergraphs using FPIs have been recently constructed for solar observations (Bonaccini et al. 1989; Bendlin et al. 1992; Cavallini 1998; Kentischer et al. 1998). The spectral passband of an FPI varies with the angle of incidence of a plane wave which transver ...
... within the channeled spectrum. Several filtergraphs using FPIs have been recently constructed for solar observations (Bonaccini et al. 1989; Bendlin et al. 1992; Cavallini 1998; Kentischer et al. 1998). The spectral passband of an FPI varies with the angle of incidence of a plane wave which transver ...
Diffuse optical imaging
... twice the haemoglobin content of healthy tissue, and reduced oxygen content (Leff et al. 2007). The technology used for optical mammography can be split into three main groups: imaging the compressed breast; imaging the uncompressed breast; and using a hand-held scanner. We examine each of these in ...
... twice the haemoglobin content of healthy tissue, and reduced oxygen content (Leff et al. 2007). The technology used for optical mammography can be split into three main groups: imaging the compressed breast; imaging the uncompressed breast; and using a hand-held scanner. We examine each of these in ...
Comparison of the Leukocyte differentiation
... reagents containing detergents and fluorescent stains, by using the 2-parameter flowcytometric method. The scattergrams of the 2 channels have different patterns due to the differences in the reagents used as well as differences in the hardware and software. In particular, the WDF channel differenti ...
... reagents containing detergents and fluorescent stains, by using the 2-parameter flowcytometric method. The scattergrams of the 2 channels have different patterns due to the differences in the reagents used as well as differences in the hardware and software. In particular, the WDF channel differenti ...
Nanowire Grid Polarizers for Mid- and Long-Wavelength
... The wire grid polarizer (WGP) remains one of the most useful optical components in the field and is prevalent in applications ranging from imaging and displays to communications and scientific instrumentation. The WGP typically consists of an array of metallic lines with sub-wavelength pitch support ...
... The wire grid polarizer (WGP) remains one of the most useful optical components in the field and is prevalent in applications ranging from imaging and displays to communications and scientific instrumentation. The WGP typically consists of an array of metallic lines with sub-wavelength pitch support ...
Femtosecond powder diffraction with a laser-driven hard X
... A multilayer X-ray optic focuses the X-rays emitted in forward direction onto the powder sample. The optic collects X-rays in a solid angle of approximately 10−4 , resulting in a X-ray flux of 106 photons per seconds on the sample. The X-ray spot size on the sample is between 30 to 200 μ m (FWHM), d ...
... A multilayer X-ray optic focuses the X-rays emitted in forward direction onto the powder sample. The optic collects X-rays in a solid angle of approximately 10−4 , resulting in a X-ray flux of 106 photons per seconds on the sample. The X-ray spot size on the sample is between 30 to 200 μ m (FWHM), d ...
Sample pages 1 PDF
... where h is Planck’s constant (6.625 × 10−34 J s), ν is frequency (c/λ, where c is the velocity of light, i.e., 2.99 × 108 m s−1 , and λ is the wavelength of light in metres) and p is a constant characteristic of the material. In the wave theory, the radiation would be spread over the surface and wou ...
... where h is Planck’s constant (6.625 × 10−34 J s), ν is frequency (c/λ, where c is the velocity of light, i.e., 2.99 × 108 m s−1 , and λ is the wavelength of light in metres) and p is a constant characteristic of the material. In the wave theory, the radiation would be spread over the surface and wou ...
Performance of extended depth of field systems and
... stop combined with a phase function and an amplitude function playing the role of the lenses. It therefore corresponds to an optimistic upper bound of what can be achieved optically (by neglecting production loss, sensor effect, etc...). In a second step, we derive the MTF as a function of the defoc ...
... stop combined with a phase function and an amplitude function playing the role of the lenses. It therefore corresponds to an optimistic upper bound of what can be achieved optically (by neglecting production loss, sensor effect, etc...). In a second step, we derive the MTF as a function of the defoc ...
Laser hazard control checklist
... 1.1.1 Precautions are only required to prevent continuous viewing of the direct beam. For Class 1M, Class 2 and Class 2M, a momentary (0,25 s) exposure to radiation in the wavelength range 400 nm to 700 nm as would happen in accidental viewing situations is not considered hazardous. However, the las ...
... 1.1.1 Precautions are only required to prevent continuous viewing of the direct beam. For Class 1M, Class 2 and Class 2M, a momentary (0,25 s) exposure to radiation in the wavelength range 400 nm to 700 nm as would happen in accidental viewing situations is not considered hazardous. However, the las ...
Focal shift of silicon microlen array in mid
... reference value to account with a focal shift effect in micro-nano optical devices with the critical dimension on the order of the wavelength scale. Moreover, the demonstration of the focal properties measurement also provides ways to characterize the focusing effect experimentally in MIR. Our resul ...
... reference value to account with a focal shift effect in micro-nano optical devices with the critical dimension on the order of the wavelength scale. Moreover, the demonstration of the focal properties measurement also provides ways to characterize the focusing effect experimentally in MIR. Our resul ...
Issues with Telescopes
... The Mount Palomar telescope would not be able to resolve these objects It would not be able to “see” the moon ! ...
... The Mount Palomar telescope would not be able to resolve these objects It would not be able to “see” the moon ! ...
Involvement of antimicrobial peptides in mussel defence
... After incubation with FITC-labelled bacteria, hemocytes were fixed for 30 minutes in 1 volume of ice-cold 8% paraformaldehyde in 0.1 M PBS, 10% saccharose. Cells were centrifuged on slides for 5 minutes at 1,000 rpm in a cytospin. After 1 hour incubation in TBS containing 3% NGS, the cells were incu ...
... After incubation with FITC-labelled bacteria, hemocytes were fixed for 30 minutes in 1 volume of ice-cold 8% paraformaldehyde in 0.1 M PBS, 10% saccharose. Cells were centrifuged on slides for 5 minutes at 1,000 rpm in a cytospin. After 1 hour incubation in TBS containing 3% NGS, the cells were incu ...
Post-print of: J. Mater. Chem. , 2010, 20, 6408
... mesostructured thin films,10,11 clays,12 or macroporous alumina.13 In all cases their ability to optically monitor changes in the surrounding ambient under controlled conditions has been confirmed. For instance, precise adsorption isotherms9,14 or uptake kinetics15 curves based on the analysis of th ...
... mesostructured thin films,10,11 clays,12 or macroporous alumina.13 In all cases their ability to optically monitor changes in the surrounding ambient under controlled conditions has been confirmed. For instance, precise adsorption isotherms9,14 or uptake kinetics15 curves based on the analysis of th ...
recent advances - University of St Andrews
... features are required in DFB lasers. This is a very small length scale – smaller than can be conveniently made by simple photolithography – so holographic techniques are often used. Another option is to use electron beam lithography, but this is slow and requires expensive equipment. Several groups ...
... features are required in DFB lasers. This is a very small length scale – smaller than can be conveniently made by simple photolithography – so holographic techniques are often used. Another option is to use electron beam lithography, but this is slow and requires expensive equipment. Several groups ...
Laser Bandwidth Measurements in Fiber Data Delivery for Corning
... If EMB from installed fibers is lower than required, the network will suffer from increased down time, high bit-error rates (i.e. high packet loss), and higher overall system costs. Since field measurements of laser bandwidth are not always practical or recommended, the best way to demonstrate field ...
... If EMB from installed fibers is lower than required, the network will suffer from increased down time, high bit-error rates (i.e. high packet loss), and higher overall system costs. Since field measurements of laser bandwidth are not always practical or recommended, the best way to demonstrate field ...
Phase change phenomena during high power laser
... where sf (t) and sb (t) are, respectively, the shock history at the front and the back face of the transducer. Fig. 4 shows the detailed assembly of the target and PVDF transducer. The target is a 242 mm-thick nickel foil (99.95% purity). Before taking data at a laser fluence, the target surface is ...
... where sf (t) and sb (t) are, respectively, the shock history at the front and the back face of the transducer. Fig. 4 shows the detailed assembly of the target and PVDF transducer. The target is a 242 mm-thick nickel foil (99.95% purity). Before taking data at a laser fluence, the target surface is ...
Basic Physical Optics
... This principle holds for water waves, mechanical waves on strings and on springs (the Slinky!), and for sound waves in gases, liquids and solids. Most important for us, it holds for all electromagnetic waves in free space. So, if we have two light waves passing through some common point P, where Wav ...
... This principle holds for water waves, mechanical waves on strings and on springs (the Slinky!), and for sound waves in gases, liquids and solids. Most important for us, it holds for all electromagnetic waves in free space. So, if we have two light waves passing through some common point P, where Wav ...
PDF
... makes it difficult to precisely measure optical power within and between integrated devices. In addition, as the number and density of devices on a single chip grows, heat dissipation and thermal effects, such as thermal cross-talk and SOA gain reduction, become increasingly important issues that ca ...
... makes it difficult to precisely measure optical power within and between integrated devices. In addition, as the number and density of devices on a single chip grows, heat dissipation and thermal effects, such as thermal cross-talk and SOA gain reduction, become increasingly important issues that ca ...
L. Koechlin Optical principles of diffraction focusing
... No mirror, no lens : just vacuum and opaque material (except near focal plane). broad spectral domain: λ = 90nm (UV) to (IR) 25μm High angular resolution: as a solid aperture the size of the array. High dynamic range: 108 on compact objects, more with coronagraphy & postprocessing. Large tolerance i ...
... No mirror, no lens : just vacuum and opaque material (except near focal plane). broad spectral domain: λ = 90nm (UV) to (IR) 25μm High angular resolution: as a solid aperture the size of the array. High dynamic range: 108 on compact objects, more with coronagraphy & postprocessing. Large tolerance i ...
Bismuth-doped optical fibers: a challenging active medium
... performance of crystals doped with Tl and Pb—bismuth’s neighbors in the sixth period of the Periodic Table, which have similar properties—allow more definite conclusions to be drawn regarding the origin of near-IR Bi luminescence in glass and glass optical fibers.15 The optical properties of Tl-dope ...
... performance of crystals doped with Tl and Pb—bismuth’s neighbors in the sixth period of the Periodic Table, which have similar properties—allow more definite conclusions to be drawn regarding the origin of near-IR Bi luminescence in glass and glass optical fibers.15 The optical properties of Tl-dope ...
Tolerancing Optical Systems
... Striae are thread-like veins or cords which are visual indications of abruptly varying density. Striae can also be considered to be a lack of homogeneity caused by incomplete stirring of the molten glass. Some glasses contain components that evaporate during melting, causing layers of varying densit ...
... Striae are thread-like veins or cords which are visual indications of abruptly varying density. Striae can also be considered to be a lack of homogeneity caused by incomplete stirring of the molten glass. Some glasses contain components that evaporate during melting, causing layers of varying densit ...
Confocal microscopy
Confocal microscopy is an optical imaging technique for increasing optical resolution and contrast of a micrograph by means of adding a spatial pinhole placed at the confocal plane of the lens to eliminate out-of-focus light. It enables the reconstruction of three-dimensional structures from the obtained images. This technique has gained popularity in the scientific and industrial communities and typical applications are in life sciences, semiconductor inspection and materials science.