Laser Technology Laboratory The Saskatchewan Structural Sciences Centre’s Laser Technology Laboratory main purpose lies with the application of ultra-fast lasers. These short lasers pulses are a great aid in studying compounds with short fluorescent lifetime and in using non-linear optical phenomenon to optimize imaging of live cells. Disciplines from the life sciences, to chemistry, to electrical engineer make use of the facility for their research programs. Pre-requisites for access to the Laser Technology Laboratory All University of Saskatchewan and SSSC safety rules must be followed while in the Laser Technology Laboratory. Laser safety training is provided by the University of Saskatchewan, Department of Health, Safety and Environment. All users wishing to receive training on equipment housed in this portion of the facility must attend the DHSE laser safety course. All users wishing to be present while a Class 4 laser is in use must attend the DHSE laser safety course. Safety rules Additional rules applicable to the Laser Technology Laboratory. Safety form Users must sign and submit the laser safety access form to gain access the laboratory. Research officer and contact information Sophie M. K. Brunet Thorvaldson Bldg., room 186 966-1719 sophie.brunet@usask.ca photo credit: K. Brown Laser Scanning Confocal Microscopy The LSCM is primarily used for imaging fluorescent samples. Organelles and proteins in cells or tissues are imaged using native fluorescence or by adding fluorescent tags. The LSCM is based on point scanning approach to image formation whereby the information for each pixel is obtained sequentially instead of the broad area excitation approach used for widefield imaging. A laser is used for selective excitation of a fluorophore and an optical bandpass filter limits the light reaching the detector. The LSCM is useful for three-dimensional reconstruction of data. Spatial resolution ~ 300 nanometers is achievable with objectives of numerical aperture of 1.3. The Zeiss LSM 410 was upgraded by LSM Technologies (optics, detectors, and computer). The instrument is on a floating optical table to minimize vibration transfer. “LASER SCANNING CONFOCAL MICROSCOPE: A light microscope that allows imaging of fluorescent structures in thick (tens to hundreds of micrometres) specimens. A series of optical 'slices' are collected using a scanning laser beam and specially designed optics to eliminate out-offocus excited fluorescence. The slices are reconstructed to provide detailed threedimensional representations of the image data. ” From: http://www.nature.com/nrg/journal/v6/n6/glo ssary/nrg1618_glossary.html photo credit: Keith Brown Current capabilities The SSSC’s Zeiss LSM410 inverted microscope is optimized for visible light microscopy and near infrared excitation. - Standard LSCM excitation sources: multi-line argon ion laser (457, 488, 514 nm) and three HeNe lasers (543, 594, 633 nm). - A variety of emission filters for fluorescence selection (bandpass and longpass). - Objectives: 10x/0.3NA, 20x/0.75NA, 40x/1.3NA, 63x/0.9NA (dipping objective), 100x/1.3NA. - Simultaneous detection in two channels. - Optimized for simultaneous excitation at 488nm and 594nm (recommended for co-localization studies). - Time-sequence acquisition. - Differential interference contrast (DIC) with 10x and 100x objectives. - Instrument available for multi-hour and multi-day studies. Additional technical information. Advanced capabilities (contact us) Objective inverter (LSM Technologies) for upright microscopy applications Widefield imaging, CCD camera as detector (broadband excitation and emission) ~405nm excitation (achieved using the ultra-fast laser system and SHG) FCS2 Temperature control chamber (contact Dr. Jim Xiang for use of the FCS2) Two-Photon Excitation Microscopy Fluorescence Lifetime Imaging Microscopy General statement for publications You may use the following as a guideline for publication details. It is your responsibility to meet publisher requirements prior to submitting. The images were acquired using a LSM410 (Zeiss, Thornwood, NY) upgraded by LSM Technologies (Etters, PA). An excitation wavelength of ___ nm from a multiline argon ion laser / HeNe laser was used and a bandpass/longpass emission filter (part # and manufacturer) were used for imaging. The total image acquisition time was ___ seconds and the pinhole was set to _____ airy units. The step size for three-dimension reconstruction was ____ micrometers and a total of ___ images were acquired. Software for data analysis LSM410 software ImageJ LSM Image Browser (Zeiss) SOPs Base Techniques One Photon Guide* Supplement to One Photon Guide Advanced Techniques Bioptechs FCS2 chamber Objective Inverter SHG for 405nm work – requires additional training Training Information Basic training includes instructions on the use of the LSM410 with the Argon Ion laser and three HeNe lasers as excitation source according to the One Photon Guide. Operators will learn optimization of settings for proper imaging, sequential multi-colour imaging, and z-sectioning over three sessions totaling 12 hours. Don’t forget to bring a hardcopy of the documents with a * to the first training session. Detailed Training Information (what needs to be done to receive and complete training) Training Session #3* Training ‘Costs’: Users are required to pre-purchase 18 hours of use on the instrument. These hours must be used within three months of completing the training. Requests for training are processed through the Evolution system. Recommended Reading Conn, P. Michael, ed. Confocal Microscopy. San Diego: Academic Press, 1999. Diaspro, Alberto, ed. Confocal and Two-Photon Microscopy, Foundations, Applications, and Advances. New York: Wiley-Liss, 2002. Paddock, Stephen ed. Confocal Microscopy (Methods in Molecular Biology Volume 122). Totowa, NJ: Humana Press, 1998. Pawley, James B., ed. Handbook of Biological Confocal Microscopy, 2nd edition. New York: Plenum Press, 1995. Periasamy, Ammasi and Richard N. Day, eds. Molecular Imaging: FRET Microscopy and Spectroscopy. New York: Oxford UP, 2005. Yuste, Rafael, et al., eds. Imaging Neurons: A Laboratory Manual. Cold Spring Harbor, NY: Cold Spring Harbor Lab Press, 1999. Links LSM Technologies Carl Zeiss Canada Ltd., Know How - Laser Scanning Systems Other resources (some with further links): Confocal Microscopy List Molecular Expressions Nikon's MicroscopyU Olympus Microscopy Resource Center University of Arizona, Cellular Imaging Shared Service Interdisciplinary Center for Biotechnology Research, University of Florida Invitrogen, Tutorials AMU, HI, University of Helsinki, Confocal Microscopy tutorial Columbia University Medical Centre, Optical Microscopy Facility The Wellcome Trust Centre for Human Genetics, Molecular Cytogenetics and Microscopy Core Note: The Saskatchewan Structural Sciences Centre is not responsible for the content on these websites. Widefield imaging: Silver Berry Scaly Hair, Fluorescence Mammal pancreas, Fluorescence Mammal pancreas, Light transmission Muntjac skin fibroblast cells (FluoCells® prepared slide #6, Invitrogen), Fluorescence Drosophila wing, Light transmission, 10x/0.3NA versus 20x/ 0.75NA Dinosaur tooth, Fluorescence and uneven white light illumination Two-Photon Excitation Microscopy Two-photon excitation microscopy is best at reducing out-of-focus excitation thereby reducing the risk of bleaching a volume of the sample which has yet to be imaged. The two-photon process requires high photon density which is achievable at the focus point of the objective with ultra-short light pulses. In some cases two-photon excitation can reduce photo-toxicity, improving live cell imaging. The longer wavelength range required for the technique can make it possible to image thicker sample compared to excitation in the ultraviolet and visible ranges. Current capabilities The two-photon excitation microscope is an upgraded feature of the LSM410. It requires the use of the ultra-fast Mira laser in femtosecond mode as a light source. - Excitation wavelength from 700 to 100 nm. - Motorized optical correction for parfocality with one-photon excitation. - Objective 63X/0.9NA, 2.2 mm working distance (efficient for infrared transmittance). - Descanned (2 detectors with emission filter wheel) or non-descanned detection ports. Advanced capabilities (contact us) Objective inverter (LSM Technologies) for upright microscopy applications FCS2 Temperature control chamber (contact Dr. Jim Xiang for use of the FCS2) General statement for publications You may use the following as a guideline for publication details. It is your responsibility to meet publisher requirements prior to submitting. The images were acquired using a LSM410 (Zeiss, Thornwood, NY) upgraded by LSM Technologies (Etters, PA) for two-photon excitation. The excitation wavelength was ___ nm from a femtosecond pulsed Mira 900-D laser system (Coherent, Santa Clara, CA) and a ____ nm bandpass/longpass emission filter (part # and manufacturer) were used for imaging. The image was acquired using a descanned/non-descanned light path. The total image acquisition time was ___ seconds and the pinhole was set to _______ airy units. The step size for three-dimension reconstruction was ____ micrometers and a total of ___ images were acquired. Note: Emission filter in non-descanned path: E700SP-2P, Chroma, Rockingham, VT Software for data analysis Please refer to the software for LSCM. Publications Senanayake, V.; Juurlink, B.H.; Zhang, C.; Zhan, E.; Wilson, L.D.; Kwon, J.; Yang, J.; Lim, Z.L.; Brunet, S.M.K.; Schatte, G.; Maley, J.M.; Hoffmeyer, R.E.; Sammynaiken, R. “Do Surface Defects and Modification Determine the Observed Toxicity of Carbon Nanotubes?” Journal of Biomedical Nanotechnology 4.4 (2008): 515-523 SOPs Base Techniques (LSCM) One Photon Guide* Supplement to One Photon Guide Two-Photon Excitation Two-Photon Imaging* Mira, Imaging Users* Advanced Techniques Bioptechs FCS2 chamber Objective Inverter Training Information Pre-requisite: basic training on the LSM410. Minimum recommended experience: 6-8 hours using the LSM410 for one-photon excitation over two work days. Training includes turning the Verdi/Mira laser system on and off, determining the modelock status of the Mira, using the automated IR-correction optics (beam expander), laser attenuation, and using the non-descanned port. Don’t forget to bring a hardcopy of the documents with a * to the training session. Training ‘Costs’: Users are required to pre-purchase 6 hours of use on the instrument. These hours must be used within three months of completing the training. Requests for training are processed through the Evolution system. Recommended Reading Diaspro, Alberto, ed. Confocal and Two-Photon Microscopy, Foundations, Applications, and Advances. New York: Wiley-Liss, 2002. Links Many links listed for laser scanning confocal microscopy include information on two-photon excitation. LSM Technologies Note: The Saskatchewan Structural Sciences Centre is not responsible for the content on these websites. Fluorescence Lifetime Imaging Microscopy FLIM is the measurement of the lifetime of a fluorophore in an excited electronic state as a function of position on an image. This gives a picture of environment of the fluorophore. The lifetime of a fluorophore can change with chemical composition (pH, calcium concentration) or because of quenching (FRET, oxygen). At the SSSC, FLIM is based on the time domain acquisition of information in conjunction with the laser scanning confocal microscope. The pulsed laser system can used in pico- or femtosecond mode with a variety of repetition rates, and it can be used in the visible or infrared regions. Current capabilities - Excitation wavelength: Visible from 400-490 nm or two-photon excitation 700-1000 nm. - Descanned detection port for visible light excitation (selected emission filters available). - Descanned or non-descanned detection port for two-photon excitation. - Data acquisition board: SPC-830 (Becker and Hickl) - Standard detector: PMC-100-4 (Becker and Hickl) with FHWM 190 picoseconds. Advanced capabilities (contact us) Objective inverter (LSM Technologies) for upright microscopy applications FCS2 Temperature control chamber (contact Dr. Jim Xiang for use of the FCS2) Detector: Cooled MCP-PMT R3809U-51 (Hamamatsu) with FWHM ~ 35 picosecond General statements for publications You may use the following as a guideline for publication details. It is your responsibility to meet publisher requirements prior to submitting. One-photon excitation and descanned detector (RFL2 filter wheel): The FLIM time domain data was acquired using a laser scanning confocal microscope, a pulsed laser system set at ____ nm, and a SPC-830 (Becker and Hickl, Berlin, Germany) FLIM data acquisition board. The LSCM was a LSM410 (Zeiss, Thornwood, NY) upgraded by LSM Technologies (Etters, PA), the bandpass/longpass emission filter in the confocal path was a ___-___ nm (part # and manufacturer) and the pinhole was set to _____ airy units. The light path was redirected to a single photon counting photomultiplier tube, a PMC-100-4 (Becker and Hickl, Berlin, Germany), whose signal became the CFD input to the SPC-830. The laser was a Mira 900-D laser system (Coherent, Santa Clara, CA) in femto/picosecond mode, with a repetition rate modified to ______ Hz using a pulse picker PP9200, and a harmonic generator, HG 9300, changed the wavelength to ___ nm. A pick off optic was used to trigger the fast photodiode, a PHD-400 (Becker and Hickl, Berlin, Germany), to send a time decay synchronization pulse to the SPC-830. The SPC-830 was set for a total acquisition time of ____ seconds/minutes, ___ time channels, and receiving scanning synchronization information from the LSM410 for image construction of ___ pixels by ___ pixels. The scan rate of the LSM410 was carefully chosen for timing of excitation of each pixel based on the repetition rate of the laser. Two-photon excitation and non-descanned detector: The FLIM time domain data was acquired using a laser scanning confocal microscope, a pulsed laser system set at ____ nm, and a SPC-830 (Becker and Hickl, Berlin, Germany) FLIM data acquisition board. The LSCM was a LSM410 (Zeiss, Thornwood, NY) upgraded by LSM Technologies (Etters, PA) for two-photon excitation and a non-descanned emission path with a 700 nm short pass filter (E700SP-2P, Chroma, Rockingham, VT). The single photon counting photomultiplier tube detector was a PMC-100-4 (Becker and Hickl, Berlin, Germany) and its signal became the CFD input to the SPC-830. The laser was a Mira 900-D laser system (Coherent, Santa Clara, CA) in femto/picosecond mode and set to ___ nm, with a repetition rate modified to ______ Hz using a pulse picker PP9200. A pick off optic was used to trigger the fast photodiode, a PHD-400 (Becker and Hickl, Berlin, Germany), to send a time decay synchronization pulse to the SPC-830. The SPC830 was set for a total acquisition time of ____ seconds/minutes, ___ time channels, and receiving scanning synchronization information from the LSM410 for image construction of ___ pixels by ___ pixels. The scan rate of the LSM410 was carefully chosen for timing of excitation of each pixel based on the repetition rate of the laser. Software for data analysis SPC-Image (Becker and Hickl) SOPs Base Techniques (LSCM) One Photon Guide*/** Supplement to One Photon Guide FLIM FLIM SOP, SHG* SHG for LSM410 * Mira, Imaging Users* FLIM SOP, TPE** Two-Photon Imaging** Mira, Imaging Users** Advanced Techniques Bioptechs FCS2 chamber Objective Inverter Training Information Pre-requisite: basic training on the LSM410. Minimum recommended experience: 8-10 hours using the LSM410 for one-photon excitation over three work days. Training includes turning the Verdi/Mira laser system on and off, determining the modelock status of the Mira, laser attenuation, use of the FLIM data acquisition module. The user must specify the type of excitation desired (one-photon via SHG of the Mira or two-photon excitation). Don’t forget to bring a hardcopy of the documents with a * or ** (depending on the type of excitation desired) to the training session. Training ‘Costs’: Users are required to pre-purchase 8 hours of use on the instrument. These hours must be used within three months of completing the training. Requests for training are processed through the Evolution system. Recommended Reading Becker, Wolfgang. Advanced Time-Correlated Single Photon Counting Techniques. Berlin: Springer, 2005. Links Becker and Hickl Note: The Saskatchewan Structural Sciences Centre is not responsible for the content on these websites. Time-Correlated Single Photon Counting TCSPC is used to measure the fluorescence lifetime of compounds in specific environments. An ultra-fast laser pulse excites the sample and the light emitted from the sample is tagged for arrival time. A decay trace of the fluorescence as a function of time is used to determine the number of lifetime components present and their respective value. Lifetime measurements from 50 picoseconds to hundreds of nanoseconds can be measured. Current capabilities - The TCSPC data acquisition module a SPC-830 or SPC-630 (Becker and Hickl) - Time range: 3.3 nanoseconds to 2 microseconds - Choice of 1 to 4096 time channels - Cuvette holder with temperature control and magnetic stirring (FLASH 200, Quantum Northwest): -25 to +80 °C - Excitation wavelength range: 240-330 nm and 360-500 nm - Excitation pulse repetition rate: 9.5 kHz to 4.75 MHz (variable) or 76 MHz - Emission wavelength range: 400 – 910 nm (monochromator + MCP-PMT) - Detector: cooled MCP-PMT, R3809U-51 (Hamamatsu); FWHM ~ 35 picoseconds; detection wavelength range from 160 – 910nm - Motorized double subtractive monochromator (CM112, Spectral Products; gratings: 600gr/mm for visible range and 1200gr/mm for infrared region) Advanced capabilities (contact us) Detection below 400 nm (optical filter for wavelength selection) Detector: PMC-100-4 (Becker and Hickl) detector (185-820 nm and FWHM ~ 190 ps) Detection in ultra-violet and visible with CM110 monochromator (gratings AG1800-00450H or AG0600-00500) and PMC-100-4 detector Dual detectors: MCP-PMT and PMC-100-4 with CM110 (individual data acquisition boards) General statement for publications You may use the following as a guideline for publication details. It is your responsibility to meet publisher requirements prior to submitting. The time correlated single photon counting data was acquired using a pulsed laser system as an excitation source and processed via the TCSPC data acquisition board SPC-630/SPC-830 (Becker and Hickl, Berlin, Germany). The laser was a Mira 900-D laser system (Coherent, Santa Clara, CA) in femto/picosecond mode, with a repetition rate modified to ______ Hz using a pulse picker PP9200, and a harmonic generator, HG 9300, provided the wavelength of ___ nm. A pick off optic was used to trigger the fast photodiode, a PHD-400 (Becker and Hickl, Berlin, Germany), to send a time decay synchronization pulse to the SPC-630/SPC-830. The fluorescence emission was collected at Magic angle (54.7°degrees) relative to excitation beam polarization. The emission light intensity was controlled using absorbance neutral density filters to maintain a photon counting ratio of ____% relative to the excitation beam repetition rate. The emission wavelength was selected using a monochromator (CM112, Spectral Products, Putnam, CT) outfitted with a AG0600- 00500/AG1200-00750 grating and ____ mm slits. The resulting light was detected using a MCPPMT R3809U-51 (Hamamatsu, Japan), its signal was amplified using a HFAC-26 (Becker and Hickl, Berlin, Germany), and then sent to the CFD input of the SPC-630/SPC-830 which was set for a total acquisition time of ____ seconds/minutes, overflow correction on/off/stop, and ___ time channels. Software for data analysis psDecay 2000 SPC-Image TRFA Global Analysis Publications Kowalska, D., and R.P. Steer, “Quenching of MgTPP and ZnTPP fluorescence by molecular oxygen.” Journal of Photochemistry and Photobiology, A, 195, 223-227 (2008). Lu, Yin and Matthew F. Paige “An Ensemble and Single-molecule Fluorescence Spectroscopy Investigation of Calcium Green 1, a Calcium-ion Sensor” Journal of Fluorescence 17.6 (2007): 739748. SOPs Mira, General Users PP9200 HG9300- SHG HG9300- THG TCSPC, SSSC Scheduling time on the TCSPC Training Information Training on the operation of the Mira laser system is included in training for using the TCSPC. Users will learn tuning of the Mira laser (changing wavelength) and achieving modelocking (pulsing). All new users will be trained on the SSSC TCSPC detection system. Training on the HG9300 for Second Harmonic Generation (SHG) is automatic while Third Harmonic Generation (THG) is by special request. Training ‘Costs’: Users are required to pre-purchase 60 hours of use on the instrument. These hours must be used within three months of completing the training. Requests for training are processed through the Evolution system. Recommended Reading Phillips, David, and Desmond V. O’Connor. Time-Correlated Single Photon Counting. London: Academic Press, 1984. Becker, Wolfgang. Advanced Time-Correlated Single Photon Counting Techniques. Berlin: Springer, 2005. Links Becker and Hickl Boston Electronics Note: The Saskatchewan Structural Sciences Centre is not responsible for the content on these websites. Fluorescence Up-Conversion The SSSC fluorescence up-conversion system is used to measure the lifetime of short-lived fluorescent molecules in solution. The sample solution is exposed to an ultra-short laser pulse (400 nm) and the fluorescence emitted is monitored for intensity my mixing (up-conversion) it in a nonlinear crystal with another ultra-short laser pulse (800 nm), the probe. By delaying the time at which the probe pulse reaches the non-linear crystal, and mixes with the fluorescence, the intensity of the up-conversion can be monitored as a function of decay time. The up-conversion process is the sum frequency generated in the non-linear crystal by the combination of the fluorescence and the 800 nm probe light resulting in a wavelength shorter than that of the fluorescence. Lifetimes in the subnanosecond range can be measured using this technique. Current capabilities - Sample excitation wavelength: 400nm - Decay lifetime measurement - Rise-time measurement - Cross-correlation FHWM: ~ 200 femtoseconds photo credit: Keith Brown Experimental Details Fluorescence up-conversion Publications Liu, X., U. Tripathy, S.V. Bhosale, S.J. Langford and R.P. Steer, “Photophysics of tetrapyrroles in solution. II. Effects of perdeuteration, substituent nature and position and macrocycle structure and conformation in zinc(II) porphyrins” Journal of Physical Chemistry A, 112, 8986-8998 (2008). Liu, X., U. Tripathy, A. Mahammed, Z. Gross and R.P. Steer, “Photophysics of Soret-excited tetrapyrroles in solution. III. Al and Ga metallocorroles.” Chemical Physics Letters, 459, 113-118 (2008). Tripathy, U., X. Liu, D. Kowalska, S. Velate, and R.P. Steer, “Photophysics of Soret-excited tetrapyrroles in solution. I. MTPP, M = Mg, Zn, Cd.” Journal of Physical Chemistry A, 112, 58245833 (2008). X. Yao, H.-B. Kraatz and R.P. Steer, Photophysics of pyrene-labelled compounds of biophysical interest. Photochem. Photobiol. Sci., 4, 191-199 (2005). SOPs Fluorescence Up-Conversion Training Information Requests for training are processed through the Evolution system. Ultra-Fast Laser Suites Current capabilities Two class 4 ultra-fast lasers suites from Coherent Inc. are available. 1- Verdi / Mira / Pulse Picker / Harmonic Generator Description: This laser system includes a tunable Ti:Sapphire laser capable of picosecond or femtosecond pulse from 700 to 1000 nm with a repetition rate of 76 MHz. The pulse picker is used to change the repetition rate up to 4.75 MHz. The Harmonic Generator can change the near infrared beam of the Mira to the ultra-violet and visible regions of the spectrum (240-330 nm and 360-500 nm). Current applications: This system is used as a light source for the TCSPC and LSCM. It is used for two-photon excitation imaging and fluorescence lifetime measurements (FLIM and TCSPC). photo credit: Keith Brown 2- Vitesse / RegA / OPA Description: This ultra-fast pulsed laser system includes a Regenerative Amplifier (800 nm) with its pump source (Vitesse Duo) and an Optical Parametric Amplifier for visible light use (480-700 nm). Current applications: This system is used as a light source for the Up-Conversion Fluorescence Lifetime instrument. photo credit: Keith Brown Advanced capabilities Most ready for use applications of these laser suites are already mentioned elsewhere in this site. If you wish to use these lasers as light sources only, contact us for help with adapting to your project. General statements for publications You may use the following as a guideline for publication details. It is your responsibility to meet publisher requirements prior to submitting. Verdi / Mira / Pulse Picker / Harmonic Generator The laser system (Coherent, Santa Clara, CA) was a Verdi V-10 pumped Mira 900-D tunable Ti:Sapphire laser set in the pico/femtosecond mode at ___ nm. The repetition rate of the laser beam was set to ___ Hz using a pulse picker, PP9200. The wavelength was modified to ___ nm using a harmonic generator, HG9300. The average output power was ____ mW. Vitesse / RegA / OPA The laser system (Coherent, Santa Clara, CA) was a Vitesse Duo pumped RegA 9000 producing 800 nm light at a rate of ____ kHz for an average power of ____ mW. The RegA pumped the OPA9400 to produce ____ nm (____ mW power). Training Information Training on these lasers is typically done in conjunction with their current application. Requests for training are processed through the Evolution system. Links Coherent Inc. Note: The Saskatchewan Structural Sciences Centre is not responsible for the content on these websites.