Pub Date : 1900-01-01DOI: 10.1109/QELS.2003.238449
M. Soltani, A. Adibi, Yong Xu, R. Lee
Systematic design of directional couplers in photonic crystals is considered, and three methods to control the coupling length are proposed. Bending of coupled waveguide is considered and optimum frequency of operation to get efficient waveguide coupling and bending is presented.
{"title":"Systematic design of directional couplers in photonic crystal","authors":"M. Soltani, A. Adibi, Yong Xu, R. Lee","doi":"10.1109/QELS.2003.238449","DOIUrl":"https://doi.org/10.1109/QELS.2003.238449","url":null,"abstract":"Systematic design of directional couplers in photonic crystals is considered, and three methods to control the coupling length are proposed. Bending of coupled waveguide is considered and optimum frequency of operation to get efficient waveguide coupling and bending is presented.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116034233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/QELS.2003.238385
R. J. Jones, Jun Ye, E. Potma, X.S. Xie
The coherent superposition of mode-locked pulses stored in a passive optical cavity results in a single amplified pulse when switched out. Theoretical and experimental results demonstrate superior performance when compared with active cavity dumping techniques.
{"title":"Passive optical amplifier for picosecond and fenitosecond pulses","authors":"R. J. Jones, Jun Ye, E. Potma, X.S. Xie","doi":"10.1109/QELS.2003.238385","DOIUrl":"https://doi.org/10.1109/QELS.2003.238385","url":null,"abstract":"The coherent superposition of mode-locked pulses stored in a passive optical cavity results in a single amplified pulse when switched out. Theoretical and experimental results demonstrate superior performance when compared with active cavity dumping techniques.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116228554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/QELS.2003.238326
G. Paulus
We present the first experimental evidence for an effect of the absolute phase. Atoms are ionized by a short laser pulse and the electrons leaving the ion core are registered with two detectors facing each other on opposite sides of the laser beam. Thus, each laser pulse can be characterized by the number of electrons emitted to the left and the right. Accordingly, the laser shots are recorded in a contingency map. Due to the absolute phase, a laser shot that produces a lot of electrons flying to the right has a high probability to produce only a few flying to the left. This anticorrelation becomes visible as a structure perpendicular to the diagonal.
{"title":"Strong-field photoionization and the absolute phase of few-cycle laser pulses","authors":"G. Paulus","doi":"10.1109/QELS.2003.238326","DOIUrl":"https://doi.org/10.1109/QELS.2003.238326","url":null,"abstract":"We present the first experimental evidence for an effect of the absolute phase. Atoms are ionized by a short laser pulse and the electrons leaving the ion core are registered with two detectors facing each other on opposite sides of the laser beam. Thus, each laser pulse can be characterized by the number of electrons emitted to the left and the right. Accordingly, the laser shots are recorded in a contingency map. Due to the absolute phase, a laser shot that produces a lot of electrons flying to the right has a high probability to produce only a few flying to the left. This anticorrelation becomes visible as a structure perpendicular to the diagonal.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"21 47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129096229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/QELS.2003.238384
R. Quintero-Torres, M. Navarro, M. Ackermann, J. Diels
We present a bidirectional pulsed ring laser working as differential spectrometer to measure absolute scattering coefficient. The threshold for locking the beat note is used and a scattering amplitude, R, of 10/sup -12/ was measured.
{"title":"Bidirectional ring laser as a scatterometer","authors":"R. Quintero-Torres, M. Navarro, M. Ackermann, J. Diels","doi":"10.1109/QELS.2003.238384","DOIUrl":"https://doi.org/10.1109/QELS.2003.238384","url":null,"abstract":"We present a bidirectional pulsed ring laser working as differential spectrometer to measure absolute scattering coefficient. The threshold for locking the beat note is used and a scattering amplitude, R, of 10/sup -12/ was measured.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122612152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thermal effects and laser performances are reported for edge-pumped microchip Yb:YAG laser. Astigmatic and spherical thermal lens were measured. 135 W peak power in quasicontinuous operation with 10 Hz and 10% duty factor was obtained.
{"title":"Diode edge-pumped microchip composite Yb:YAG laser: thermal effects and laser performances","authors":"T. Dascălu, T. Taira, N. Pavel, I. Shoji","doi":"10.2184/LSJ.33.228","DOIUrl":"https://doi.org/10.2184/LSJ.33.228","url":null,"abstract":"Thermal effects and laser performances are reported for edge-pumped microchip Yb:YAG laser. Astigmatic and spherical thermal lens were measured. 135 W peak power in quasicontinuous operation with 10 Hz and 10% duty factor was obtained.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115537329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/QELS.2003.238375
A. Bartels, T. Ramond, S. Diddams, L. Hollberg
We phase-lock the repetition rates of two Ti:sapphire femtosecond lasers to an optical reference oscillator at their 456000th harmonic and achieve sub-femtosecond timing jitter. A system that can be continuously stabilized for periods approaching one day is demonstrated.
{"title":"Synthesis of ultrastable femtosecond pulse trains from an optical reference oscillator","authors":"A. Bartels, T. Ramond, S. Diddams, L. Hollberg","doi":"10.1109/QELS.2003.238375","DOIUrl":"https://doi.org/10.1109/QELS.2003.238375","url":null,"abstract":"We phase-lock the repetition rates of two Ti:sapphire femtosecond lasers to an optical reference oscillator at their 456000th harmonic and achieve sub-femtosecond timing jitter. A system that can be continuously stabilized for periods approaching one day is demonstrated.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115226159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/QELS.2003.238383
M. Naruse, H. Mitsu, M. Furuki, I. Iwasa, Y. Sato, S. Tatsuura, M. Tian, F. Kubota
We present a femtosecond timing measurement and control technique for jitter or skew reduction using a squarylium dye J-aggregate film as an ultra-fast two-dimensional optical switch. Jitter reduction is demonstrated.
{"title":"Jitter and skew reduction using an ultra-fast two-dimensional organic optical switch","authors":"M. Naruse, H. Mitsu, M. Furuki, I. Iwasa, Y. Sato, S. Tatsuura, M. Tian, F. Kubota","doi":"10.1109/QELS.2003.238383","DOIUrl":"https://doi.org/10.1109/QELS.2003.238383","url":null,"abstract":"We present a femtosecond timing measurement and control technique for jitter or skew reduction using a squarylium dye J-aggregate film as an ultra-fast two-dimensional optical switch. Jitter reduction is demonstrated.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122385763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/QELS.2003.238382
L. Arissian, J. Diels
The fluorescence and index of refraction of two-photon resonant rubidium are investigated as a function of repetition rate and wavelength of a mode-locked train of pulses.
研究了双光子共振铷的荧光和折射率与锁模脉冲序列的重复频率和波长的关系。
{"title":"Use of Rb transitions to lock both the wavelength and repetition rate of a mode-locked laser","authors":"L. Arissian, J. Diels","doi":"10.1109/QELS.2003.238382","DOIUrl":"https://doi.org/10.1109/QELS.2003.238382","url":null,"abstract":"The fluorescence and index of refraction of two-photon resonant rubidium are investigated as a function of repetition rate and wavelength of a mode-locked train of pulses.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121524326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/QELS.2003.238518
S. Lukishova, A. Schmid, A. McNamara, R. Boyd, C. Stroud
Operation of a single photon source is demonstrated via photon antibunching in the fluorescence of single terrylene molecules embedded in a cholesteric host. The use of a one-dimensional photonic band gap of planar aligned cholesteric layers will allow further increase in the source efficiency.
{"title":"Demonstration of a room temperature single-photon source: laser control of single dye molecule fluorescence in photonic-band-gap cholesteric liquid crystal host","authors":"S. Lukishova, A. Schmid, A. McNamara, R. Boyd, C. Stroud","doi":"10.1109/QELS.2003.238518","DOIUrl":"https://doi.org/10.1109/QELS.2003.238518","url":null,"abstract":"Operation of a single photon source is demonstrated via photon antibunching in the fluorescence of single terrylene molecules embedded in a cholesteric host. The use of a one-dimensional photonic band gap of planar aligned cholesteric layers will allow further increase in the source efficiency.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128139161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/CLEOE.2003.1313497
K. Tillman, D. Reid, D. Artigas, J. Hellstrom, V. Pasiskevicius, F. Laurell
We describe an high-gain optical parametric oscillator incorporating highly chirped pump-pulses and a 20mm aperiodically-poled crystal of potassium titanyl-phosphate. Results include a threshold pump power of 14.4mW and a signal slope efficiency of 37%. 02002 Optical Society of America Ocis Codes: (190.4410) Non-linear optics, parametric oscillators, (190.4970) Parametric oscillators,( 190.71 10) Ultrafast non-linear optics, (320.1 590) Chirping, (320.2250) Femtosecond phenomena, (999.9999) Quasi-phasematching. In femtosecond optical parametric oscillators (OPOs), the finite bandwidth of the pump pulse places an upper limit on the size of crystal that can be used. Under conventional phasematching, bandwidth depends inversely on the crystal length and consequently only short crystals are used in femtosecond OPOs as those of excessive length show strong back-conversion and low overall efficiency. On the other hand, the limited single-pass gain available in short crystals requires high pump threshold powers. Conventional crystals are therefore incapable of simultaneously providing low pump thresholds and high conversion efficiencies due to the conflicting length criteria imposed by the requirement of a broad bandwidth and a high single-pass gain [I]. Theoretical results indicate that by chirping the crystal poling periods [2,3] it should be possible to reduce threshold values while maintaining the crystal phasematching bandwidth, even for very long crystals. The ability to reduce operational thresholds in femtosecond OPOs is of particular interest as one practical consequence would be the possible use of low-power diode-based femtosecond oscillators such as Cr3':LiSAF as pump sources. This report describes an experimental validation of our earlier work in which an OPO containing a 20mm crystal of aperiodically-poled potassium titanyl-phosphate (APPKTP) [4] is pumped by chirped pulses derived from a femtosecond Tksapphire laser oscillator. In order to achieve parametric conversion using an aperiodically-poled crystal, the pre-chirped pump pulses must be matched to the chirp of the quasi-phasematched grating. Fig. I illustrates the situation adopted in our experiment where an unchirped signal pulse walks through a chirped pump-pulse as the two pulses co-propagate through the aperiodically-poled crystal. The chirped pump-pulse entering the crystal sees its longer wavelengths, present in the trailing edge of the pulse, being converted to signal pulses by the larger local grating period at the entrance of the crystal. The progressively longer wavelengths seen across the pump-pulses are converted to signal pulses by the progressively shorter local gratings within the crystal until the shorter wavelengths present on the leading edge of the pump-pulses are converted to signal pulses by the shortest local grating period seen at the exit of the crystal. The wavelength and bandwidth of the pump-pulse automatically define the mean crystal period and aperiodicit
{"title":"Low-threshold femtosecond optical parametric oscillators based on chirped-pulse frequency conversion in long aperiodically-poled crystals","authors":"K. Tillman, D. Reid, D. Artigas, J. Hellstrom, V. Pasiskevicius, F. Laurell","doi":"10.1109/CLEOE.2003.1313497","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1313497","url":null,"abstract":"We describe an high-gain optical parametric oscillator incorporating highly chirped pump-pulses and a 20mm aperiodically-poled crystal of potassium titanyl-phosphate. Results include a threshold pump power of 14.4mW and a signal slope efficiency of 37%. 02002 Optical Society of America Ocis Codes: (190.4410) Non-linear optics, parametric oscillators, (190.4970) Parametric oscillators,( 190.71 10) Ultrafast non-linear optics, (320.1 590) Chirping, (320.2250) Femtosecond phenomena, (999.9999) Quasi-phasematching. In femtosecond optical parametric oscillators (OPOs), the finite bandwidth of the pump pulse places an upper limit on the size of crystal that can be used. Under conventional phasematching, bandwidth depends inversely on the crystal length and consequently only short crystals are used in femtosecond OPOs as those of excessive length show strong back-conversion and low overall efficiency. On the other hand, the limited single-pass gain available in short crystals requires high pump threshold powers. Conventional crystals are therefore incapable of simultaneously providing low pump thresholds and high conversion efficiencies due to the conflicting length criteria imposed by the requirement of a broad bandwidth and a high single-pass gain [I]. Theoretical results indicate that by chirping the crystal poling periods [2,3] it should be possible to reduce threshold values while maintaining the crystal phasematching bandwidth, even for very long crystals. The ability to reduce operational thresholds in femtosecond OPOs is of particular interest as one practical consequence would be the possible use of low-power diode-based femtosecond oscillators such as Cr3':LiSAF as pump sources. This report describes an experimental validation of our earlier work in which an OPO containing a 20mm crystal of aperiodically-poled potassium titanyl-phosphate (APPKTP) [4] is pumped by chirped pulses derived from a femtosecond Tksapphire laser oscillator. In order to achieve parametric conversion using an aperiodically-poled crystal, the pre-chirped pump pulses must be matched to the chirp of the quasi-phasematched grating. Fig. I illustrates the situation adopted in our experiment where an unchirped signal pulse walks through a chirped pump-pulse as the two pulses co-propagate through the aperiodically-poled crystal. The chirped pump-pulse entering the crystal sees its longer wavelengths, present in the trailing edge of the pulse, being converted to signal pulses by the larger local grating period at the entrance of the crystal. The progressively longer wavelengths seen across the pump-pulses are converted to signal pulses by the progressively shorter local gratings within the crystal until the shorter wavelengths present on the leading edge of the pump-pulses are converted to signal pulses by the shortest local grating period seen at the exit of the crystal. The wavelength and bandwidth of the pump-pulse automatically define the mean crystal period and aperiodicit","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124636871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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