BaGa2GeSe6 (BGGSe) Crystal: Advanced Nonlinear Optical Material for Ultrafast Mid-IR Pulse Generation
Description
In 2016, for the first time in the world, a new nonlinear crystal of high optical quality BaGa2GeSe6 was obtained, which has nonlinearity coefficients d11 = 23.6, d22 = 18.5, d31 = 18.3 pm/V. Transmission range 0.522–18 microns, band gap width 2.38 eV, resistance to laser radiation 5.35 J/cm2.
BGGSe is a nonlinear material that is attractive for high—frequency mixing and generation of ultrashort pulses due to its relatively low dispersion and high damage threshold. Experimental studies show the ability of the material to generate pulses in the mid-IR range with an octave coverage of up to 18 microns. From the first experiment, it can be seen that a 2.6 mm long BGGSe crystal gives a pulse energy of 21 PJ at a frequency of 100 MHz with a spectral bandwidth from 5.8 to 8.5 microns and a pulse duration of 91 fs, which corresponds to less than four optical octaves and confirms the prospects of using this material to create ultrashort generation pulses.
New unique results on parametric transformations of laser radiation on BGGS are given in several articles [write to us and we will link to them]. Many optical experiments require a wide range of laser frequencies, laser coherence, and high brightness. Desktop lasers and large synchrotron installations cannot meet all these requirements. Currently, a compact light source has been developed that provides simultaneous radiation in seven frequency octaves — from the terahertz to the ultraviolet range. A desktop light source provides five orders of magnitude more brightness than synchrotron sources and can become an important tool for hyperspectral spectroscopy and imaging in medical and environmental research.
In the experimental setup, radiation was generated using ultrashort laser pulses of the mid-IR range fed to an optical parametric amplifier of chirped pulses. The radiation then passed through a photonic crystal fiber with an antiresonance reflection 20 cm long. A hollow fiber with an inner diameter of 92 microns was located inside a chamber filled with argon. A change in gas pressure from 20 to 35 bar changed the generation of solitons and dispersion waves in the system. A pressure of 25 bar provides the most efficient generation of dispersion waves.
Next, the radiation fell on a 2.6 mm thick BaGa2GeSe6 crystal, on which the difference frequency was generated, spreading the radiation spectrum from 340 to 40,000 nm. The BaGa2GeSe6 optical element, developed in the Laboratory of the latest Badikov Technologies, surpassed GaSe and ZnGeP2 in terms of efficiency in this device in terms of the best combined quality factor.
Pressure regulation in the fiber pump allows not only to change the spectral intensity depending on the experimental conditions, but also to obtain peak power in ultraviolet up to 2.5 MW, and power in THz up to 1.8 MW, which opens up completely new prospects for nonlinear and multidimensional spectroscopy.
The coherent radiation spectrum with a width of seven octaves provides continuous restructuring of radiation from ultraviolet to terahertz range and makes it possible to use new multimodal measurement techniques, for example, in molecular spectroscopy, physical chemistry or solid state physics. For the first time, high peak power made it possible to achieve intensity values in the ultraviolet and terahertz spectral ranges, measured in TW/cm2, which makes it possible to study attosecond force fields and study new phenomena such as the visualization of electrons in crystal lattices and their interaction, phase transitions, superconductivity or topological physics. These scientific works are a breakthrough in science and in the creation of new technologies for the development of mankind.
BaGa2GeSe6 (BGGSe) Crystal: Advanced Nonlinear Optical Material for Ultrafast Mid-IR Pulse Generation
Specifications |
|
|---|---|
| Crystal Type: | |
| Phase Mathcing Type: | Not Applicable |
| Mounting: | Unmounted |
| Width: | 10 mm |
| Height: | 10 mm |
| Length: | 15 mm |
| Flatness: | <= Lambda/6 |
| Surface Quality (Scratch-Dig): | Not Available |
| AR Coating: | Not Coated |
For pricing, technical or any other questions please contact the supplier
- No registration required
- No markups, no fees
- Direct contact with supplier
Contact Supplier
How to order?
-
Ships from:
Russia
-
Sold by:
-
On FindLight:
since 2022