1. High resolution molecular spectroscopy
High-resolution molecular spectroscopy is closely related to the internal structure of the molecule, and is an effective method to study the molecular structure. It can be used to study the fine and ultra-fine splitting of the spectrum, Zeeman and Stark splitting, optical displacement, collision widening, and collision displacement effect. In the experimental research of high-resolution molecular spectroscopy, the requirements for the light source are very strict, usually requiring higher output power, very narrow line width, wide spectral tuning range, better frequency stability and automatic electronic scanning device.
â‘´Mid-infrared spectrum measurement
Our company's agent SpectroStar of Germany ELS company is a high-power single-frequency mid-infrared (2-5μm) OPO (SpectroStar) pumped with VersaDisk-1030 solid-state laser, which fills the world without high-power single-frequency light source in this spectrum The history has provided a powerful scientific tool for researchers engaged in high-resolution mid-infrared spectroscopy.
SpectroStar features:
l High power: output power can reach several W (nm).
l Narrow line width: single frequency, line width <10-4cm-1.
l Tuning range: 2-5um (tuning the birefringent filter in the VersaDisk-1030 cavity).
l Electronic scanning control: realize wavelength scanning, continuous scanning range is about 5cm-1.
VersaDisk-1030
1000-1060nm cw
35W SF @ 1030nm
Figure 1 SpectroStar's spectrum measurement application
Figure 2 Structure design of SpectroStar
⑵Near infrared and visible spectrum measurement
The titanium-sapphire / dye single-frequency ring cavity laser of German company RadiantDyes, which is represented by our company, is very suitable for the research of high-resolution molecular spectroscopy.
Main parameters of Ti: Sapphire / Dye single frequency ring cavity laser:
l Tuning range (dye): 400-850nm;
l Tuning range (titanium gem): 700-950nm;
l Line width: 1MHz;
l Frequency drift: 100MHz / hour;
l Scanning range: 30GHz;
l Mode: TEM00;
l Polarization: vertical;
Advantages compared to competitors:
l The thin and thick etalons in the laser cavity of the single-frequency Ti: Sapphire / dye ring cavity can be used simultaneously and adjusted separately, which is a necessary condition to obtain excellent beam quality.
l Its digital scan generator can tune to long wave or short wave continuously or manually. Scanning can be stopped at any wavelength, and then continue to tune (continuous or manual).
l During the scanning process, the user can set the scanning time and the scanning speed (1MHz / second).
l The reference cavity will convert any frequency drift into an error signal. The high frequency error signal is fed back to the folding cavity mirror mounted on the PDT, and the low frequency error signal is fed back to the Brewster window to control the cavity length and stability, so the frequency of the entire system is stable Sex is very good.
2. Bose-Einstein Condensation and Optical Tweezers
Fundamental:
When the matter continues to cool down, when it approaches absolute zero (-273.16.c), all bosons are gathered in the same quantum state, and the atoms cannot be distinguished. This state is called Bose-love Einstein Condensed Matter (BEC). Therefore, to achieve the Bose-Einstein condensate, the material must be continuously cooled. The principle of laser cooling is that the atoms facing the laser will absorb the laser. Due to the conservation of momentum, the speed will slow down, while other atoms are not affected. Influence, if irradiated from all directions, the atoms will be quiet as a whole, that is, the atoms are cooled.
Optical tweezers are three-dimensional potential wells formed by a beam of highly condensed laser light. The mechanical effects of light can be used to capture and manipulate tiny particles. In photobiophysics research, the use of laser mechanical effects
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