Facility: CLAS Ultra Fast Laser Facility

Home > Facilities > CLAS Ultra Fast Laser Facility


Function: Analytical/Synthesis

Department: CLAS Research Technical Services
College/Unit: COLLEGE OF LIBERAL ARTS AND SCIENCES

Description:

This multi-user facility is specialized in the development and application of time-resolved laser spectroscopy to chemical, biological and material research. It provides advanced laser technologies and instruments for spectroscopic and imaging measurements to observe chemical reactions in real time with temporal resolution down to femtosecond time scales and spatial resolution and sensitivity to the point where single molecule signals are detectable. The femtosecond spectroscopy part of the facility consists of several femtosecond Ti:Sapphire lasers coupled with transient absorption and fluorescence spectrometers, providing users with a broad range of excitation and probe wavelength for kinetic measurements. The single molecule microscopy part of the facility consists of both pulsed and CW lasers, confocal microscopes and single photon counting detection systems.

Link to More Details:
http://rts.clas.asu.edu/laser

Facility People

Resources (9)

5W Ti:S laser (5W Ti:S)

This laser, pumped by a 5W Millennia laser, provides 100-fs laser pulses up to 1 W power at 800 nm and 82 MHz repetition rate. The output wavelength can be tuned from 720 - 940 nm. The laser can be coupled to customer designed optics based on research demands.

Femtosecond 10W-pumped Ti:S laser (10W Ti:S)

This laser, pumped by a 10W Millennia laser, provides 100-fs laser pulses up to 1.8 W power at 800 nm, 82 MHz repetition rate. The output wavelength can be tuned from 700 - 980 nm. The laser can be coupled to customer designed optics based on research demands.

Femtosecond Transient Spectrometer (BBPP)

Thumb The femtosecond pump-probe spectrometer is for transient absorbance change measurements. The system contains three pump-probe optical setups, each optimized for specific type of measurements. The shared excitation source consists of a KHz regeneratively-amplified Ti:S laser, two optical parametric amplifiers (Spectra Physics). Together, the system provides excitation between 270 – 1550 nm with 150 fs pulses. The repetition rate between 1 and 1000 Hz. The two broadband pump-probe detection systems are capable of recording complete absorbance change spectra from 400 – 1000 nm. The third optical detecting system has the capability to perform single-wavelength absorbance change measurements with higher signal-to-noise ratio. All systems can measure transient absorbance changes up to 7 ns delay with a 100-fs time resolution.

Nanosecond-Millisecond Transient Spectrometer (EOS)

Thumb The ns-ms pump-probe spectroscopy setup is a commercial system (EOS) by Ultrafast Systems. It measures transient absorbance changes over the wavelength region from 360 – 915 nm and a time resolution of less than 1 ns (typically 600 – 800 ps). This system shares the same excitation source as the femtosecond pump-probe described above. The measuring time window is determined by the laser repetition rate, which can be varied between 1 and 1000 Hz.

Oxford liquid nitrogen cryostat (Oxford)

Thumb The system provides temperature control from 77 – 330 K .

Picosecond Time-Correlated Single Photon Counting I (TCSPC1)

Thumb Two laser sources availabe to provide excitation wavelength from 370 - 940 nm: a femtosecond Ti:S laser (Spectra Physics) with a frequency doubler and a pulse selector to cover excitation wavelength region from 350 – 470 nm and from 700 – 940 nm. The laser can be operated at 0.4, 0.8, and 4 MHz. Additional excitation in the wavelength region from 450 – 750 nm is provided by a supercontinuum white light laser with 6-ps pulses (Fianium, SP450). The Beker-Hickl TCSPC card has a 40 ps instrument response. The detection system consists of a visible and a near IR MCP-PMT capable of recording fluorescence kinetics from 330 - 1100 nm and up to 2 us in time.

Picosecond–microsecond fluorescence Spectrometer (StrCam)

Thumb The time-resolved fluorescence spectrometer system consists of a femtosecond Titanium:Sapphire laser system operated at both MHz and KHz repetition rates (Coherent). The MHz system is a broadband Ti:S oscillator coupled with a pulse selector and a second harmonic generator, covers a wavelength region from 700 – 1000 nm and 350 – 500 nm and a repetition rate from single shot (1 Hz) to 76 MHz. The KHz system uses the MHz oscillator as a seed laser to pump a regenerative amplifier and an OPA operated between 100 – 250 KHz. The output wavelength covers from 250 – 750 nm. The detecting system consists of a spectrograph, a streak camera with fast and a slow time sweep units. The system is designed to record fluorescence signal as a function of time and wavelength with a time resolution of 5 ps and wavelength region from 320 – 950 nm.

Single Molecule Detection System (SM-Ar)

Thumb The single molecule setup uses a confocal microscope for optical characterization of solutions and surfaces down to a single molecule resolution. It consists of a microscope (Nikon) coupled to a continuous-wave (CW) . Excitation is available at multiple wavelengths in the visible region from a CW Argon/Krypton laser. These instruments can monitor a number of fluorescent properties on the surface including fluorescent anisotropy and multiple wavelengths. The fluorescence detection range is 450 - 850 nm. The spatial resolution of this system is less than 500 nm. Fluorescence correlation spectroscopy can be measured using a correlator with 25 ns time resolution.

Time-Resolved Single Molecule Detection System (TR-SM)

Thumb The single molecule setup uses a confocal microscope for optical characterization of solutions and surfaces down to a single molecule resolution. It consists of a microscope (Nikon) coupled to a pulsed laser. Excitation is available from 480 - 750 nm from a supercontinuum white light laser with 6-ps pulses (Fianium). The instruments can monitor a number of fluorescent properties on the surface including fluorescent lifetime via time-correlated single photon counting, anisotropy and multiple wavelengths. The fluorescence detection range is 450 - 850 nm. The spatial resolution of this system is less than 500 nm. Fluorescence correlation spectroscopy can be measured using a correlator with 25 ns time resolution.

View All Facilities