Construction of a femtosecond mode
... chosen so that a sufficiently self-focused beam can pass the aperture without attenuation, due to the smaller beam size, whilst a less focused beam will undergo attenuation due to diffraction losses. Use of a physical aperture, called a 'hard' aperture, can thus create an intensity-dependent loss m ...
... chosen so that a sufficiently self-focused beam can pass the aperture without attenuation, due to the smaller beam size, whilst a less focused beam will undergo attenuation due to diffraction losses. Use of a physical aperture, called a 'hard' aperture, can thus create an intensity-dependent loss m ...
Acousto-Optic Devices - Panasonic Industrial Devices
... A piezoelectric element is bonded to an acousto-optic medium consisting of single crystal such as tellurium dioxide (TeO2) and lead molybdate (PbMoO4) or glass, and when an electrical signal is applied to this piezoelectric element to generate acoustic waves, which are propagated in the medium, a la ...
... A piezoelectric element is bonded to an acousto-optic medium consisting of single crystal such as tellurium dioxide (TeO2) and lead molybdate (PbMoO4) or glass, and when an electrical signal is applied to this piezoelectric element to generate acoustic waves, which are propagated in the medium, a la ...
report - CREATE project
... instead of 75 fs, centered at the same wavelength, we should obtain 2.5 fold higher signal. However reduced pulse duration is associated with increased bandwidth of the laser, thus dealing with the dispersion by the optical elements becomes more difficult. For such a short pulses as 30 fs the higher ...
... instead of 75 fs, centered at the same wavelength, we should obtain 2.5 fold higher signal. However reduced pulse duration is associated with increased bandwidth of the laser, thus dealing with the dispersion by the optical elements becomes more difficult. For such a short pulses as 30 fs the higher ...
Lasers Essay Research Paper The light from
... The light from lasers differs from ordinary light in several important aspects. Ordinary light from a light bulb travels randomly in all directions (unless the bulb is equipped with an integral reflector that directs the light). The light is thus incoherent. Even when incoherent light is directed wi ...
... The light from lasers differs from ordinary light in several important aspects. Ordinary light from a light bulb travels randomly in all directions (unless the bulb is equipped with an integral reflector that directs the light). The light is thus incoherent. Even when incoherent light is directed wi ...
laser1
... Light Amplification by Stimulated Emission of Radiation • A device produces a coherent beam of optical radiation by stimulating electronic, ionic, or molecular transitions to higher energy levels • When they return to lower energy levels by stimulated emission, they emit energy. ...
... Light Amplification by Stimulated Emission of Radiation • A device produces a coherent beam of optical radiation by stimulating electronic, ionic, or molecular transitions to higher energy levels • When they return to lower energy levels by stimulated emission, they emit energy. ...
Tunable External-Cavity High
... The saturation polarization will be proportional to the amount of laser power available in the region of D1 Rb absorption of Rb. Therefore one desires a laser with high power and a very narrow linewidth in the region of absorption. ...
... The saturation polarization will be proportional to the amount of laser power available in the region of D1 Rb absorption of Rb. Therefore one desires a laser with high power and a very narrow linewidth in the region of absorption. ...
Exercice N°1 : Laser à 4 niveaux
... A : Einstein coefficient for spontaneous emission, 1/A=100µs, : probability per second to decay from level 3 to level 2 and from level 1 to level 0 (this rate is very high compared to the other rates), : cross section at 1064 nm, =7,6 10-19 cm2, p : pump cross section (at 808 nm or at 914 nm), ...
... A : Einstein coefficient for spontaneous emission, 1/A=100µs, : probability per second to decay from level 3 to level 2 and from level 1 to level 0 (this rate is very high compared to the other rates), : cross section at 1064 nm, =7,6 10-19 cm2, p : pump cross section (at 808 nm or at 914 nm), ...
Mode-locking
Mode-locking is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration, on the order of picoseconds (10−12 s) or femtoseconds (10−15 s).The basis of the technique is to induce a fixed-phase relationship between the longitudinal modes of the laser's resonant cavity. The laser is then said to be 'phase-locked' or 'mode-locked'. Interference between these modes causes the laser light to be produced as a train of pulses. Depending on the properties of the laser, these pulses may be of extremely brief duration, as short as a few femtoseconds.