Lastek Principals

Ekspla Laser Spectroscopy

  • Ekspla T-SPEC Series Real-time Terahertz Spectrometer

    Ekspla T-SPEC Series Real-time Terahertz Spectrometer

    The T-SPEC Real-time Terahertz Spectrometer offered by Eksplais a powerful tool for investigative applications of pulsed terahertz waves. With simple and robust design, it is easy-to-use and adaptable to individual requirements. The unique design of microstrip photoconductive antenna fabricated on low-temperature grown GaAs substrate ensures broadband spectral coverage and high dynamic range. The system is designed with two delay lines: fast and slow. Fast scan line allows real time data acquisition with 10 spectra/s speed and 110 ps time window. Average of collected spectra can increase dynamic range to 70 dB at pulse maximum and extend spectral range up to 4.5 THz. Additional slow delay line allows combination of multiple time windows; thus spectrometer obtains excellent spectral resolution < 2.5 GHz. The fast scan line is designed without bearings and uses a magnetically coupled drive which makes it extremely reliable and significantly extends the lifetime. T-SPEC spectrometer has hermetic housing with mounted gas inlets. Read more. 

  • Ekspla T-Fiber Series Fiber Coupled Terahertz Spectrometer

    Ekspla T-Fiber Series Fiber Coupled Terahertz Spectrometer

    The Fiber-coupled Terahertz Spectrometer T-FIBER, offered by Ekspla, features flexible and robust design. It has integrated femtosecond fiber laser with two fiber output ports. Comparing to common Ti:S oscillators, fiber lasers are smaller, cheaper, more reliable and feature parameters that are perfect for terahertz generation. Femtosecond laser, delay line and signal registration electronics are integrated in a single compact housing with footprint only 40×40 cm. Minimal set of free space optics used in spectrometer allows stable long time operation. Special “no bearing” design of fast delay line makes its lifetime practically unlimited. Delay line allows real time data acquisition with 10 spectra/s speed and 110 ps time window. Read more.

  • Ekspla CARS Microspectrometer

    Ekspla CARS Microspectrometer

    Coherent anti-Stokes Raman scattering (CARS) spectroscopy primarily was used in chemistry, physics and related fields. It is sensitive to the same vibrational signatures of molecules as seen in Raman spectroscopy, typically the nuclear vibrations of chemical bonds. Unlike Raman spectroscopy, CARS employs multiple photons to address the molecular vibrations, and produces a signal in which the emitted waves are coherent with one another. As a result, CARS is orders of magnitude stronger than spontaneous Raman emission. CARS is a third-order nonlinear optical process involving three laser beams: a pump beam of frequency ω pump , a Stokes beam of frequency ω Stokes and a probe beam at frequency ω probe. Read more. 

  • Ekspla SFG Spectrometer Sum Frequency Generation (SFG) Vibrational Spectrometer

    Ekspla SFG Spectrometer Sum Frequency Generation (SFG) Vibrational Spectrometer

    The Ekspla Sum frequency generation (SFG) spectrometer is based on picosecond pump laser and optical parametric generator (OPG) with difference frequency generation (DFG) extension. Solid state mode-locked Nd:YAG laser featuring high pulse duration and energy stability is used in the system. Fundamental laser radiation splits into several channels in multichannel beams delivery unit. Two of these beams are used for pumping OPG and DFG. Small part of laser output beam, usually with doubled frequency (532 nm), is directed to VIS channel of SFG spectrometer. IR channel of spectrometer is pumped by DFG output beam. All system components are designed to operate in tandem. The sizes of individual compartments, positions of apertures and beams heights are fitted. As a result SFG spectrometer takes less space in laboratory. Standard versions usually fit on 1000×2400 mm optical table. No laser beams are passing across optical table. For example beam dedicated for VIS channel passes through OPG compartment only to minimize the risk of accident with dangerous high intensity laser radiation. It makes Ekspla spectrometer substantially safer comparing to home-made SFG-VS setups. Also optical parameters, like beam diameter, pulse energy, delays between channels are perfectly matched. We designed our spectrometer thinking about user friendly operation. Read more. 

Lasers & other Sources

Principals: Lasers