Imperial College London

ProfessorPaulFrench

Faculty of Natural SciencesDepartment of Physics

Professor of Physics and Vice Dean (Research) - FoNS
 
 
 
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Contact

 

+44 (0)20 7594 7706paul.french Website

 
 
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Assistant

 

Ms Judith Baylis +44 (0)20 7594 7713

 
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Location

 

609Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

482 results found

FRENCH PMW, WILLIAMS JAR, TAYLOR JR, 1989, FEMTOSECOND PULSE GENERATION FROM A TITANIUM-DOPED SAPPHIRE LASER USING NONLINEAR EXTERNAL CAVITY FEEDBACK, OPTICS LETTERS, Vol: 14, Pages: 686-688, ISSN: 0146-9592

Journal article

FRENCH PMW, OPALINSKA MM, TAYLOR JR, 1989, PASSIVELY MODE-LOCKED CW COUMARIN 6-RING DYE-LASER, OPTICS LETTERS, Vol: 14, Pages: 217-218, ISSN: 0146-9592

Journal article

FRENCH PMW, TAYLOR JR, 1989, CW-PUMPED DYES YIELD ULTRASHORT LASER-PULSES, LASER FOCUS WORLD, Vol: 25, Pages: 59-&, ISSN: 0740-2511

Journal article

Avramopoulos H, French PMW, Williams JAR, New GHC, Taylor JRet al., 1988, Experimental and theoretical studies of pulse evolutions in a femtosecond dye laser.

The performance of a passively mode-locked femtosecond rhodamine 110 dye laser has been investigated as a function of an intracavity glass path. For particular values, periodic modulation occurs in the laser output, and satellite pulses appear in the intensity autocorrelation profile as shown. A detailed numerical model of the laser has been developed that takes into account saturable gain and loss, spectral filtering, linear dispersion, and a nonlinear frequency chirp arising from both the optical Kerr effect in the dye solvents and saturation in the mode-locking dye. The model reproduces all the experimental observations generating multipeaked autocorrelation profiles and periodic pulse evolutions. The excellent qualitative agreement between theory and experiment permits determination of the absolute value of the intracavity group velocity dispersion and predicts many properties of the laser pulses such as asymmetry. The model has also made it possible to identify the mechanism causing periodic behavior at zero group velocity dispersion in the experimental laser, and it has reproduced the N = 3 solitonlike pulse evolutions of F. Salin et al. (1986) after appropriate changes to parameter values.

Conference paper

French PMW, Taylor JR, 1988, Generation of sub-100-fs pulses tunable around 497 nm from a colliding-pulse mode-locked ring dye laser.

A passively mode-locked CW coumarin 102 dye laser has been constructed in a colliding-pulse mode-locked configuration. The laser incorporates a prism sequence to provide adjustable group velocity dispersion and is tuned by an aperture located at the midpoint of the prism sequence. Pulses of <100-fs duration have been obtained at a repetition rate of approx. 200 MHz from 493 to 503 nm with total average output powers of up to 6 mW. A typical autocorrelation trace obtained at 498 nm of pulses of approx. 90-fs duration (assuming sech2pulse profiles) is shown. Assuming the standard compression factor of √2 in the frequency-doubling process, the laser yields pulses of approx. 65-fs duration at 248 nm. The effects of using various saturable absorbers have been investigated.

Conference paper

WILLIAMS JAR, FRENCH PMW, TAYLOR JR, GOLDSMITH Het al., 1988, PASSIVE-MODE LOCKING OF A CW ENERGY-TRANSFER DYE-LASER OPERATING IN THE INFRARED NEAR 800 NM, OPTICS LETTERS, Vol: 13, Pages: 811-813, ISSN: 0146-9592

Journal article

AVRAMOPOULOS H, FRENCH PMW, WILLIAMS JAR, NEW GHC, TAYLOR JRet al., 1988, EXPERIMENTAL AND THEORETICAL-STUDIES OF COMPLEX PULSE EVOLUTIONS IN A PASSIVELY MODE-LOCKED RING DYE-LASER, IEEE JOURNAL OF QUANTUM ELECTRONICS, Vol: 24, Pages: 1884-1892, ISSN: 0018-9197

Journal article

FRENCH PMW, TAYLOR JR, 1988, GENERATION OF SUB-100-FSEC PULSES TUNABLE NEAR 497 NM FROM A COLLIDING-PULSE MODE-LOCKED RING DYE-LASER, OPTICS LETTERS, Vol: 13, Pages: 470-472, ISSN: 0146-9592

Journal article

FRENCH PMW, TAYLOR JR, 1988, THE PASSIVELY MODE-LOCKED COUMARIN 6H RING DYE-LASER, OPTICS COMMUNICATIONS, Vol: 67, Pages: 51-52, ISSN: 0030-4018

Journal article

French P, Taylor R, 1988, MAKING LIGHT WORK., Engineering (London), Vol: 228, Pages: 72-74, ISSN: 0013-7782

Over the past few years, the laser has moved out of the research laboratory to become a well-known industrial tool. This article discusses new developments that seem likely to increase its use by industry, for applications from metal cutting to microelectronics. Applications discussed include plastic model making, laser welding, uranium isotope separation, and others.

Journal article

FRENCH PMW, WILLIAMS JAR, TAYLOR JR, 1987, PASSIVELY MODE-LOCKED CW DYE-LASERS OPERATING FROM 490-NM TO 800-NM, REVUE DE PHYSIQUE APPLIQUEE, Vol: 22, Pages: 1651-1655, ISSN: 0035-1687

Journal article

FRENCH PMW, WILLIAMS JAR, TAYLOR JR, 1987, PASSIVE-MODE LOCKING OF A CONTINUOUS-WAVE ENERGY-TRANSFER DYE-LASER OPERATING IN THE NEAR-INFRARED AROUND 750 NM, OPTICS LETTERS, Vol: 12, Pages: 684-686, ISSN: 0146-9592

Journal article

FRENCH PMW, TAYLOR JR, 1987, PASSIVE-MODE LOCKING OF A CONTINUOUS WAVE DYE-LASER OPERATING IN THE BLUE-GREEN SPECTRAL REGION, APPLIED PHYSICS LETTERS, Vol: 50, Pages: 1708-1709, ISSN: 0003-6951

Journal article

GOMES ASL, GOUVEIANETO AS, FRENCH PMW, AVRAMOPOULOS H, NEW GHC, TAYLOR JRet al., 1987, OPTICAL PULSE-COMPRESSION OF RAMAN-DEPLETED PICOSECOND PULSES AND SPECTRALLY WINDOWED SELF-PHASE MODULATED PULSES AT 1.06-MU-M, IEE PROCEEDINGS-J OPTOELECTRONICS, Vol: 134, Pages: 171-179, ISSN: 0267-3932

Journal article

FRENCH PMW, TAYLOR JR, 1987, THE PASSIVELY MODE-LOCKED AND DISPERSION COMPENSATED RHODAMINE-110 DYE-LASER, OPTICS COMMUNICATIONS, Vol: 61, Pages: 224-228, ISSN: 0030-4018

Journal article

French PMW, Taylor JR, 1987, RHODAMINE 110 PASSIVELY MODE-LOCKED CPM RING DYE LASER., Pages: 210-211

Rhodamine 110 was used as the active dye with two saturable absorbers: HlC (1,1,3,3,3 prime ,3 prime -hexamethylindocarbocyanine iodide) and DASBTI left bracket 2-(p-dimethylaminostyryl)-benzthiacarbocyaninelodide right bracket . Various dispersion-optimized linear and ring cavities were examined. The shortest pulses of 80-fs duration were obtained from a simple colliding pulse mechanism (CPM) ring cavity where the laser wavelength and intracavity dispersion were controlled by the dielectric mirrors. Pulses as short as 100 fs were obtained from a CPM ring cavity which contained a set of four prisms to adjust the dispersion. This laser has many features in common with a standard system, but there are important differences. In particular, the usual soliton shaping effect resulting from the interaction of positive self-phase modulation and negative dispersion is not observed to be dominant, but high-order solitons formed by the interaction of negative self-phase modulation and positive dispersion have been observed. The negative self-phase modulation most probably arises in the saturable absorber.

Conference paper

French PMW, Taylor JR, 1987, PASSIVELY MODE-LOCKED CW DYE LASERS IN THE BLUE-GREEN.

The technique used for recently reported passively mode-locked systems operating continuously from 553 to 700 nm**2, yielding pulses as short as 80 fs, is extended to cover the blue-green portion of the spectrum (490-550 nm), where there are currently no available CW mode-locked lasers due to the lack of suitable synchronous pump sources. The dye laser cavity is similar to that previously described for systems in the red and yellow. The active dyes, which have been mode-locked to give subpicosecond pulses, are coumarin derivatives that have been pumped by a UV-enhanced argon-ion laser. Stilbene derivatives that cover the deep blue portion of the spectum have also been investigated.

Conference paper

FRENCH PMW, GOMES ASL, GOUVEIANETO AS, TAYLOR JRet al., 1986, SPECTRAL OPTIMIZATION OF A SYNCHRONOUSLY MODE-LOCKED FEMTOSECOND DYE-LASER, OPTICS COMMUNICATIONS, Vol: 60, Pages: 389-392, ISSN: 0030-4018

Journal article

French PMW, Gomes ASL, Gouveia-Neto AS, Taylor JRet al., 1986, RAMAN GENERATION, PUMP PULSE DEPLETION AND COMPRESSION IN SINGLE MODE OPTICAL FIBER., ISSN: 0963-3308

The propagation of picosecond pulses in single mode fibers gives rise to many non-linear effects. Of these, self phase modulation SPM and stimulated Raman scattering SRS are dominant. In the SRS process the Raman exponential gain is proportional to the pump power, the pump pulse should commence a nonlinear depletion at its peak. As the SRS process takes place over the full length of the fiber, total depletion of the center of the pulse should occur. We have examined this depletion mechanism, up to the fourth order Stokes Raman pulse in a cascading process. In addition we have carried out a pulse compression technique on the remaining fragments which exhibit a negative chirp. A Q-switched and mode locked c. w. Nd:YAG laser (a modified Quantronix model 116) was used as the source of fundamental pump pulses.

Conference paper

FRENCH PMW, GOMES ASL, GOUVEIANETO AS, TAYLOR JRet al., 1986, PICOSECOND STIMULATED RAMAN GENERATION, PUMP PULSE FRAGMENTATION, AND FRAGMENT COMPRESSION IN SINGLE-MODE OPTICAL FIBERS, IEEE JOURNAL OF QUANTUM ELECTRONICS, Vol: 22, Pages: 2230-2235, ISSN: 0018-9197

Journal article

FRENCH PMW, GOMES ASL, GOUVEIANETO AS, TAYLOR JRet al., 1986, A FEMTOSECOND HYBRID MODE-LOCKED RHODAMINE-B DYE-LASER, OPTICS COMMUNICATIONS, Vol: 59, Pages: 366-368, ISSN: 0030-4018

Journal article

FRENCH PMW, TAYLOR JR, 1986, PASSIVE-MODE LOCKING OF THE CONTINUOUS WAVE DCM DYE-LASER, APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY, Vol: 41, Pages: 53-55, ISSN: 0721-7269

Journal article

FRENCH PMW, TAYLOR JR, 1986, PASSIVE-MODE LOCKING OF AN ENERGY-TRANSFER CONTINUOUS-WAVE DYE-LASER, IEEE JOURNAL OF QUANTUM ELECTRONICS, Vol: 22, Pages: 1162-1164, ISSN: 0018-9197

Journal article

FRENCH PMW, GOMES ASL, GOUVEIANETO AS, TAYLOR JRet al., 1986, SPECTRAL OPTIMIZATION OF A SYNCHRONOUSLY MODE-LOCKED FEMTOSECOND DYE-LASER, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 3, Pages: P248-P250, ISSN: 0740-3224

Journal article

FRENCH PMW, GOMES ASL, GOUVEIANETO AS, TAYLOR JRet al., 1986, PICOSECOND PULSE-COMPRESSION OF ND-YAG LASER-PULSES DEPLETED THROUGH STIMULATED RAMAN-SCATTERING IN SINGLE-MODE OPTICAL FIBERS, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 3, Pages: P124-&, ISSN: 0740-3224

Journal article

FRENCH PMW, TAYLOR JR, 1986, PASSIVELY MODE-LOCKED CONTINUOUS-WAVE RHODAMINE-110 DYE-LASER, OPTICS LETTERS, Vol: 11, Pages: 297-299, ISSN: 0146-9592

Journal article

FRENCH PMW, GOMES ASL, GOUVEIANETO AS, TAYLOR JRet al., 1986, TEMPORAL COMPRESSION OF ND-YAG PULSES USING CHIRP COMPENSATION, OPTICAL AND QUANTUM ELECTRONICS, Vol: 18, Pages: 171-174, ISSN: 0306-8919

Journal article

FRENCH PMW, TAYLOR JR, 1986, THE PASSIVE MODELOCKING OF THE CONTINUOUS WAVE RHODAMINE-B DYE-LASER, OPTICS COMMUNICATIONS, Vol: 58, Pages: 53-55, ISSN: 0030-4018

Journal article

GOMES ASL, FRENCH PMW, GOUVEIANETO AS, TAYLOR JRet al., 1986, APPLICATION OF OPTICALLY COMPRESSED ND-YAG LASER-PULSES IN SYNCHRONOUSLY PUMPED HIGH-POWER DYE-LASERS AND THE OPTICALLY BIASED DYE-LASER, OPTICA ACTA, Vol: 33, Pages: 437-444, ISSN: 0030-3909

Journal article

FRENCH PMW, CHEN GF, SIBBETT W, 1986, TUNABLE GROUP-VELOCITY DISPERSION INTERFEROMETER FOR INTRACAVITY AND EXTRACAVITY APPLICATIONS, OPTICS COMMUNICATIONS, Vol: 57, Pages: 263-268, ISSN: 0030-4018

Journal article

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