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Método no invasivo y dispositivo para determinar la fluencia de saturación y sección transversal de absorción eficaz de un conmutador Q

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TORO20160203001
Publicado:
08/03/2017
Caducidad:
06/09/2017
Resumen:
Un instituto de investigación rumano ha desarrollado un dispositivo y método no invasivo para la medición directa de la fluencia de saturación de un conmutador óptico pasivo y la sección transversal de absorción eficaz de sus centros saturables. Este método permite caracterizar un componente esencial de un láser de estado sólido, el conmutador óptico pasivo, para diseñar un láser de mayor rendimiento. El láser puede emplearse en las industrias de medicina (cirugía láser) y mecánica (soldadura, corte y perforación). El instituto busca socios industriales interesados en financiar y continuar con el desarrollo del prototipo.





Details

Tittle:
Non-invasive method and device for determining saturation fluency and effective absorption cross section of a Q-switch
Summary:
A Romanian research institute has developed a device and non-invasive method for the direct measurement of saturation fluency of a passive optical switch as well as the absorption effective cross section of their saturable centers. The device can be used in the mechanical and medical sector. Industrial partners are sought for, in order to finance and further develop a prototype.
Description:
A research institute from Romania has developed a device and non-invasive method with possible applications in the mechanical and medical sectors.
The patent relates to a method to characterize an essential component of a solid state laser - passive optical switch, in order to design / achieve a laser with improved performance.
Such a laser can be used in medicine (laser surgery) and mechanical industry (welding, cutting, drilling).
Until now, there have not been developed other similar solutions.
The method consists in the use of a laser device to illuminate with laser pulses the Q-switch. The laser pulses have uniform transversal intensity distributions, with controlled variable intensity and full width at half- amplitude smaller than the lifetime of the excited level of the measured Q-switch.
The aim is to measure the transmittance of the analyzed Q-switch as a function of the laser pulse intensity, being expressed as the ratio between the data registered by an energymeter, in the presence and in the absence of the analyzed Q-switch.
The passive optical switch transmittance is measured as a function of the laser pulses intensity, by the ratio between the values recorded with a laser power monitor in the presence and the absence of the passive optical switch. It checks that the Q-switch transmittance measured at very low laser pulse intensities, approximately equals to the value previously measured by a spectrophotometer. The Q-switch transmittance is measured at very high laser pulse intensities and it approximately equals the value measured before the formation of saturable absorption color centers inside it, i.e. the product of the transmittances of the losses by Fresnel reflection on the active optical surfaces and those due to the usual parasite losses.
Thus achieves a measurement of the transmittance variation of the passive optical switch as a function incident fluency at laser´s wavelength.
The method allows the direct evaluation of the saturation fluency of a Q-switch and of the effective absorption cross section by a single measurement, by experimentally measuring the variation of transmittance at laser operating wavelength of a Q-switch illuminated by laser pulses. It also has full width at half amplitude smaller than the lifetime on absorber centers electronic level of the Q-switch. These pulses are expanded by a Galileo telescope, afterwards there is selected the central part of the laser beam. Subsequently, after applying a controlled attenuation, the laser beam is transmitted through the passive optical switch to be analyzed, the energy thereof being measured by a laser energy monitor with silicon photodiode.
The device consists of a solid state laser operated in passive optical commutation regime. The laser comprises: a total reflecting mirror, a polarizer, the tested Q-switch, an active laser medium, a diaphragm and an extraction mirror that outputs laser pulses, then a Galileo telescope that expands the beam, a circular diaphragm for obtaining a constant cross distribution of the beam intensity, a calibrated attenuator in order to vary, in a controlled way, the fluency of the laser pulses, a laser energy monitor, a system for data acquisition and a PC.
The Romanian research team is looking for industrial partners that are willing to finance and develop a prototype.
Advantages and Innovations:
- Non-invasive, highly reliable method, not requiring any penetration of Q- switch to be tested;
- Allows assessment of the saturation fluency incident value on the Q-switch as well as the absorption effective cross section of the saturable optical centers of the Q-switch at laser wavelength in the range 0.5 ... 5 -Y-micro;m;
- Requires low costs of production and use.
Stage of Development:
Concept stage
IPs:
Patents granted,Exclusive Rights
CommeR Statunts Regarding IPR Status:
Patent granted by the Romanian State Office for Inventions and Trademarks (IP rights on national level - Romania).

Partner sought

Type and Role of Partner Sought:
Partner sought: industrial partner
Tasks to be performed by partner: financing the development of a prototype

Client

Type and Size of Client:
R&D Institution
Already Engaged in Trans-National Cooperation:
No
Languages Spoken:
English

Keywords

Technology Keywords:
01002003 Electronic engineering
01002008 Optical Networks and Systems
06001013 Tecnología médica / ingeniería biomédica