Institute for Photonics & Advanced Sensing (IPAS)
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IPAS brings together physicists, chemists and biologists to pursue a new transdisciplinary approach to science. We are developing novel photonic, sensing and measurement technologies that will change the way science is done within traditional discipline areas, stimulating the creation of new industries, and inspiring a new generation of scientists to be engaged in solving real-world problems. IPAS research targets applications in four key market areas:
- Defence and national security
- Environmental monitoring
- Preventative health
- Food and wine
The Institute for Photonics & Advanced Sensing has been founded on the success of the Centre of Excellence Photonics, a joint centre of the University of Adelaide and DSTO and the recognition of the importance that new forms of Advanced Sensing will play in the world.
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Item Metadata only A pulsed laser source using stimulated Raman scattering and difference frequency mixing: Remote sensing of methane in air(Elsevier BV, 1995) Lancaster, D.; Dawes, J.Mid-infrared radiation at 3.43 μm is generated by difference frequency mixing a 1.064 μm Nd:YAG laser with a methane gas Raman shifted Nd:YAG (1.064 μm) laser at 1.54 μm in KTiOAsO₄(KTA). Using this pulsed (7 ns), moderate energy (1 mJ) source we demonstrate the optical detection of methane in air and measure an absorption coefficient of 1.2cm⁻¹ atm⁻¹. Additional source characteristics include an intrinsic wavelength stability defined by the methane Raman vibrational frequency and a moderate linewidth (1.5 cm⁻¹).Item Open Access Methane detection with a narrow-band source at 3.4 µm based on a Nd:YAG pump laser and a combination of stimulated Raman scattering and difference frequency mixing(Optical Society of America, 1996) Lancaster, D.; Dawes, J.Item Metadata only Combined temperature strain discrimination in optical fibre sensors(1997) Murphy, Dominic F.; Flavin, Donal A.; Internet of Things Conference (1997 : Sligo, Ireland); School of Chemistry and PhysicsItem Metadata only Novel gas sensor based on difference frequency mixing using all fiber beam delivery(IEEE, 1998) Lancaster, D.; Curl, R.; Tittel, F.; Goldberg, L.; Koplow, J.; Conference on Lasers and Electro-Optics (CLEO) (1998 : Glasgow, Scotland)Item Metadata only Mid infrared sensors using periodically poled LiNbO3 for trace gas detection(IEEE, 1998) Tittel, F.; Lancaster, D.; Richter, D.; Curl, R.; Conference on Lasers and Electro-Optics (CLEO) (1998 : Glasgow, Scotland)Item Metadata only Tunable mid-infrared laser-based gas sensors: new technologies and applications(IEEE, 1998) Lancaster, D.; Tittel, F.; Richter, D.; Petrov, K.; Curl, R.; Conference on Lasers and Electro-Optics (CLEO) (1998 : San Francisco, CA, USA)This work describes the design and performance characteristics of room-temperature mid-infrared diode-pumped sensors capable of either single or multicomponent real-time trace gas detection in ambient air. The difference-frequency-generation based sensor technology employs periodically poled lithium niobate crystals with multiple grating periods pumped by two single-frequency solid-state lasers and a thermoelectrically cooled HgCdTe infrared detector.Item Metadata only A Fully automated diode laser based difference frequency spectrometer tunable from 12-16 µm(IEEE, 1998) Putnam, R.; Lancaster, D.; Conference on Lasers and Electro-Optics Europe (CLEO) (1998 : Glasgow, Scotland)Item Metadata only Fibre coupled difference frequency generation utilising ytterbium-doped fibre amplifier and periodically poled LiNbO3(1998) Lancaster, D.; Goldberg, L.; Koplow, J.; Curl, R.; Tittel, F.A new mid-infrared tunable spectroscopic source based on fibre coupled difference frequency generation in bulk periodically-poled LiNbO₃for trace gas detection is reported. The source mixes the outputs of a fibre coupled external cavity diode laser and a 1083 nm seeded Yb-doped fibre amplifier. Powers up to 0.8 μW are obtained in the 3.8-4.3 μm rangeItem Metadata only Thermal-lens measurement of a quasi steady-state repetitively flashlamp-pumped Cr, Tm, Ho:YAG laser(Elsevier, 1998) Lancaster, D.; Dawes, J.Item Open Access Mid-infrared difference-frequency generation source pumped by a 1.1-1.5-μm dual-wavelength fiber amplifier for trace-gas detection(Optical Society of America, 1998) Goldberg, L.; Koplow, J.; Lancaster, D.; Curl, R.; Tittel, F.Item Metadata only Compact mid-infrared trace gas sensor based on difference frequency mixing(SPIE, 1999) Tittel, F.; Lancaster, D.; Richter, D.; Goldberg, L.; Koplow, J.; Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Processing Monitoring II (1999 : Denver, CO, USA); Fried, A.Item Metadata only Detection of carbon monoxide from biological tissue using difference frequency generation in periodically-poled lithium niobate near 4.6 µm(Society of Photo-Optical Instrumentation Engineers, 1999) Morimoto, Y.; Klattenhoff, J.; Durante, W.; Lancaster, D.; Curl, R.; Tittel, F.; Cohn, G.E.; Owicki, J.C.Item Metadata only Portable fiber-coupled diode-laser-based sensor for multiple trace gas detection(Springer-Verlag, 1999) Lancaster, D.; Richter, D.; Tittel, F.Tunable narrowband mid-infrared radiation from 3.25 to 4:4 mm is generated by a compact fiber-coupled, difference-frequency-based spectrosopic source. A 20-mW external cavity diode laser (with a tuning range from 814 to 870 nm) and a 50-mW distributed-Bragg-reflector diode-laser- seeded ytterbium-doped fiber amplifier operating at 1083 nm are difference-frequency mixed in a multi-grating, temperature-controlled periodically poled LiNbO3 crystal. A conversion efficiency of 0:44mW/(W₂cm) (corresponding to a power of ≈3 μW at 3:3 μm) represents the highest conversion efficiency reported for a portable device. Performance characteristics of such a sensor and its application to spectroscopic detection of CO2, N2O, H2CO, HCl, NO2, and CH4 will be reported in this work.Item Open Access Continuous-wave laser spectrometer automatically aligned and continuously tuned from 11.8 to 16.1 μm by use of diode-laser-pumped difference-frequency generation in GaSe(Optical Society of America, 1999) Putnam, R.; Lancaster, D.Item Metadata only High-power continuous-wave mid-infrared radiation generated by difference frequency mixing of diode-laser-seeded fiber amplifiers and its application to dual-beam spectroscopy(Optica Publishing Group, 1999) Lancaster, D.; Richter, D.; Curl, R.; Tittel, F.; Goldberg, L.; Koplow, J.Item Metadata only Quantum projection noise in an atomic fountain: a high stability cesium frequency standard(American Physical Society, 1999) Santarelli, G.; Laurent, P.; Lemonde, P.; Clairon, A.; Mann, A.G.; Chang, S.; Luiten, A.N.; Salomon, C.We describe the operation of a laser cooled cesium fountain clock in the quantum limited regime. An ultrastable cryogenic sapphire oscillator is used to measure the short-term frequency stability of the fountain as a function of the number of detected atoms Nat. For Nat varying from 4 × 104 to 6 × 105 the Allan standard deviation of the frequency fluctuations is in excellent agreement with the Nat-1/2 law of atomic projection noise. With 6 × 105 atoms, the relative frequency stability is 4 × 10-14τ-1/2where Τ is the integration time in seconds. This is the best short-term stability ever reported for primary frequency standards, a factor of 5 improvement over previous results. © 1999 The American Physical Society.Item Metadata only Dispersion in holey optical fibers(Optical Society of America, 1999) Monro, T.; Richardson, D.; Broderick, N.; Bennett, P.; Wavelength Division Multiplexing Components (1999 : USA)Holey fibers are described using an efficient new technique based on decompositions of the electric field and fiber profile. Unique and interesting dispersion properties are predicted, including dispersion flattening and anomalous dispersion below 1:3μm.Item Metadata only Sub-ppb detection of trace gas species with a high-power diode-pumped cw difference-frequency sensor(IEEE, 2000) Lancaster, D.; Rehle, D.; Leleux, D.; Tittel, F.; Conference on Lasers and Electro-Optics (CLEO) (2000 : San Francisco, CA , USA)Summary form only given. To increase the difference-frequency power produced in an optical trace gas sensor we have developed an architecture based on two frequency-stable diode lasers at 1.1 and 1.5 μm, which are amplified by high-power Yb and Er-doped fiber amplifiers, respectively. To date we have generated up to 0.7 mW of narrow-band (<60 MHz) mid-infrared radiation.Item Metadata only Field intercomparison of a novel optical sensor for formaldehyde quantification(American Geophysical Union (AGU), 2000) Friedfeld, S.; Fraser, M.; Lancaster, D.; Leleux, D.; Rehle, D.; Tittel, F.A one‐week in situ intercomparison campaign was completed on the Rice University campus for measuring HCHO using three different techniques, including a novel optical sensor based on difference frequency generation (DFG) operating at room temperature. Two chemical derivatization methods, 2,4‐dinitrophenylhydrazine (DNPH) and o‐(2,3,4,5,6‐pentafluorobenzyl) hydroxylamine (PFBHA), were deployed during the daylight hours for three‐ to four‐hour time‐integrated samples. A real‐time optical sensor based on laser absorption spectroscopy was operated simultaneously, including nighttime hours. This tunable spectroscopic source based on difference frequency mixing of two fiber‐amplified diode lasers in periodically poled LiNbO3 (PPLN) was operated at 3.5315 µm (2831.64 cm−1) to access a strong HCHO ro‐vibrational transition free of interferences from other species. The results showed a bias of −1.7 and −1.2 ppbv and a gross error of 2.6 and 1.5 ppbv for DNPH and PFBHA measurements, respectively, compared with DFG measurements. These results validate the DFG sensor for time‐resolved measurements of HCHO in urban areas.Item Metadata only Laser absorption spectroscopy of atmospheric formaldehyde(IEEE, 2000) Tittel, F.; Richter, D.; Rehle, D.; Leleux, D.; Lancaster, D.; Fraser, M.; Fried, A.; Conference on Lasers and Electro-Optics Europe (CLEO) (2000 : Nice, France)Summary form only given. For the real time detection of atmospheric CH2O with ultra high sensitivity and excellent selectivity, a cw tunable mid-IR spectroscopic source based on difference frequency generation (DFG) has been developed. The motivation for such a laser source is the acquisition of high quality CH2O concentration measurements. Formaldehyde is an important intermediate present in all regions of the atmosphere and in testing the current understanding of hydrocarbon photochemistry. CH2O plays also a critically important role in the chemistry of the urban atmosphere because of health effects associated with CH2O, as well as its role in ground-level ozone formation.