1. RECENT DEVELOPMENT IN SUM FREQUENCY GENERATION SPECTROSCOPY SYSTEMS
Michael Patterson, Lucian Hand
Altos Photonics, Bozeman, MT
Zenonas Kuprionis
EKSPLA UAB, Vilnius, Lithuania

2. Outline 50 Hz SFG spectrometer Double resonance SFG
SFG imaging microscope
USB-CAN data acquisition system

3. 50 Hz Sum Frequency Generation Spectrometer
PL2241 series – new generation of picosecond lasers
Features:
Robust, reliable diode pumped oscillator
Folded, more stable regenerative amplifier
Frequencies up to 250 Hz
Wide range of output energies
Disadvantages of our standard SFG spectrometer:
Long spectra acquisition time
Complicated maintenance
New 50 Hz system:
Up to five time faster data acquisition
More easy maintenance
PL2241/50 + PG501
Compromise of high repetition rate and high enough output energy
Efficient pump source for SFG set-up

4. 50 Hz Sum Frequency Generation Spectrometer: Spectra samples

5. Double resonance SFG option
Doubly resonant SFG spectrum selectively enhances the vibrational modes through their electron-vibration coupling
Features
Two parametrical generators pumped by single powerful laser
Wide tunability of VIS wavelength 210 – 680 nm
Triple monochromator for tunable VIS rejection
Automatic compensation of tunable VIS delay
Special design for high UV throughput
Doubly resonant enhancement of Rhodamine SFG spectra

6. SFG imaging microscope (joint project with Steven Baldelli group, HU)
ICCD
Tube lens
Notch filters
Objective
Diffraction grating
Sample
1064 nm beam
IR beam
1064 nm Filter
532 nm Filter
Design
Far field imaging
Detection via an intermediate image on the surface of a blazed grating
Upgradeable option of standard EKSPLA SFG spectrometer
An image of ODT covered etched gold sample. The first lines are spaced, in order left -right  20, 5, 2, and 8 micrometers. Image taken at ωIR=2875 cm-1 and acquired for 5000 laser shots.

7. Information transfer USB-CAN bus
What is “Controller Area Network” ?
CAN is a serial bus system especially suited for networking “intelligent” devices as well as sensors and actuators within a system or sub-system
What can Ekspla offer for this type of system?
Si, Ge, GaAs ... photodiode-based photodetectors
PMT-based photodetectors
Motion controller
Laser diode power supply
HV power supply
TEC cooler controller

8. Take advantage of our 10 years experience in SFG
We offer:
Highly qualified consultations and assistance
Picosecond lasers with outstanding stability
Picosecond OPG/OPA/DFG
Laser accessories and components
Photonics components, beam delivery optics