Several organic polymers and sol-gel derived porous silica were investigated as cladding material of a fused silica optical fi ber as well as a solid phase microextraction (SPME) material in an eff ort to develop an e...Several organic polymers and sol-gel derived porous silica were investigated as cladding material of a fused silica optical fi ber as well as a solid phase microextraction (SPME) material in an eff ort to develop an evanescent wave optical fi ber chemical sensor (EW-OFCS) for detecting acetylsalicylic acid (ASA) in aqueous sample solutions.A dip-coating method was adopted for coating a polymer on the fi ber core surface of a bent optical fi ber probe (BOFP) as a cladding/SPME membrane.Among the polymers investigated,it was found that cellulose triacetate (CTA) can function as a SPME material for concentrating ASA from aqueous sample solution into CTA membrane coated on BOFP surface.The ASA concentrated into the CTA membrane was detected by passing a light beam through the BOFP and detecting the fi ber optic EW absorption signal at ASA’s intrinsic peak absorption wavelength (310 nm).No chemical reaction was involved in the developed sensor and no chemical reagent is needed in using the sensor for detecting ASA in an aqueous sample solution.The sensor response is reversible because SPME is a reversible process.This SPME-EW-OFCS achieved a detection limit of 0.72μg/mL for detecting ASA in aqueous sample solutions.The sensor has been used for analyzing ASA in pharmaceutical Aspirin products,and obtained analytical results agree well with a conventional UV/Vis absorption spectrometric method.展开更多
Quantum communication is a new technology requiring a stable and reliable laser source for communication security. A new kind of polarization-locked vertical-cavity surface-emitting laser （VCSEL） with polarization m...Quantum communication is a new technology requiring a stable and reliable laser source for communication security. A new kind of polarization-locked vertical-cavity surface-emitting laser （VCSEL） with polarization maintaining （PM） fiber pigtail is fabricated as a decoy state laser source. The VCSEL is packaged in a standard butterfly box integrated with thermoelectric coder （TEC） and thermistor. The optical pulse width of full-width at half-maximum （FWHM） is smaller than 400 ps with a 100-MHz on/off modulation frequency. The results reveal that modulation range is better than 4. Moreover, the polarization is stable, and the power extinction ratio is larger than 25. The center wavelength is 850 nm, and the SMSR is better than 40 dB.展开更多
基金West Texas A&M University Killgore Research Grant。
文摘Several organic polymers and sol-gel derived porous silica were investigated as cladding material of a fused silica optical fi ber as well as a solid phase microextraction (SPME) material in an eff ort to develop an evanescent wave optical fi ber chemical sensor (EW-OFCS) for detecting acetylsalicylic acid (ASA) in aqueous sample solutions.A dip-coating method was adopted for coating a polymer on the fi ber core surface of a bent optical fi ber probe (BOFP) as a cladding/SPME membrane.Among the polymers investigated,it was found that cellulose triacetate (CTA) can function as a SPME material for concentrating ASA from aqueous sample solution into CTA membrane coated on BOFP surface.The ASA concentrated into the CTA membrane was detected by passing a light beam through the BOFP and detecting the fi ber optic EW absorption signal at ASA’s intrinsic peak absorption wavelength (310 nm).No chemical reaction was involved in the developed sensor and no chemical reagent is needed in using the sensor for detecting ASA in an aqueous sample solution.The sensor response is reversible because SPME is a reversible process.This SPME-EW-OFCS achieved a detection limit of 0.72μg/mL for detecting ASA in aqueous sample solutions.The sensor has been used for analyzing ASA in pharmaceutical Aspirin products,and obtained analytical results agree well with a conventional UV/Vis absorption spectrometric method.
文摘Quantum communication is a new technology requiring a stable and reliable laser source for communication security. A new kind of polarization-locked vertical-cavity surface-emitting laser （VCSEL） with polarization maintaining （PM） fiber pigtail is fabricated as a decoy state laser source. The VCSEL is packaged in a standard butterfly box integrated with thermoelectric coder （TEC） and thermistor. The optical pulse width of full-width at half-maximum （FWHM） is smaller than 400 ps with a 100-MHz on/off modulation frequency. The results reveal that modulation range is better than 4. Moreover, the polarization is stable, and the power extinction ratio is larger than 25. The center wavelength is 850 nm, and the SMSR is better than 40 dB.
