Raman spectroscopy is a widely used technique for identifying the molecules. When a photon interacts with a molecule, usually an elastic (Rayleigh) scattering occurs. However, occasionally, the wavelength of the scattered photon shifts by interacting with the vibrational or rotational states of the molecule which provides a fingerprint specific to that molecule. An other technique is pump-probe spectroscopy which is used for observing ultrafast dynamics of molecules. For this application, two successive ultrafast pulses (the shorter the better) with an adjustable delay are needed. The first pulse pumps the molecules to their excited states and the second pulse probes the population in the excited state. By varying the delay, a time-resolved data can be obtained. Fiblas offers wide wavelength range of CW fiber lasers for Raman spectroscopy and ultrafast fiber lasers for pump-probe spectroscopy.
Interferometry is a valuable tool in metrology. By measuring the interference pattern created by two coherent beams following two different paths, it is possible to obtain valuable data about the material or the beam itself. Holographic 3D image generation is an other rapidly developing application based on recording the interference pattern of a ligth field. Single-frequency CW fiber lasers are well suited for these type of applications with their long coherence lengths.
Operating principle of LIDAR is based on transmitting a laser pulse to an object and analysing the reflected light. The distance of the object is proportional to time-of-flight of the pulse. Although shorter pulsed lasers provide more accurate results, cheaper nanosecond lasers are generally adequate and prefered in LIDAR systems. Doppler LIDARs can also detect the velocity of the object by measuring the shift in the wavelength of the reflected light. Fiblas offers nanosecond fiber lasers operating at 1 µm as well as eye-safe 1.5 µm and 2 µm wavelengths.
An optical trap (or optical tweezer) is formed by tightly focusing a laser beam which creates a very strong electric field gradient at the focal region. Dielectric particles are attracted along this gradient to the focal center where the electric field is the strongest. Although the attraction force is very weak (picoNewton level), it is possible to hold and manipulate micron size particles. Linearly polarized single-frequency CW fiber lasers are suitable for this application.
Ultrasonic testing is applicable in many industries, however, it is generally used in aerospace industry where the reliability has vital importance. An ultrasonic wave is generated when a laser pulse hits to surface and boils or ablates the material. After interacting with the material, the resulting ultrasonic wave can be detected by various methods like Fabry-Perot interferometry. Nanosecond or ultrafast fiber lasers can be used to generate such ultrasonic waves.
Pulsed laser deposition is used to grow thin films or coatings on substrates like Silicon wafers. The target material to be deposited is hit by ultrafast pulses. Each ultrafast pulse ablates small amount of material from the surface which then travels at high velocities in vacuum, arrives on the substrate's sufrace and and creates a thin, homogenous layer there. Fiblas offers high-energy ultrafast fiber lasers for this purpose.
Lasers can be pumped only at specific wavelengths and especially for solid-state lasers, the pumping bandwidth can be extremely narrow. Fiblas offers wide range of fiber lasers with customizable output parameters for pumping various types of other lasers including fiber lasers, solid-state lasers, dye lasers, mid-IR OPOs, etc.
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