A dyestuff laser which consists of a reservoir for the dyestuff solution and an energy source, coupled thereto, which is capable of exciting the dyestuff solution to produce an emission, the radiation generated lying in the wavelength range of 550 to 680 nm. The dyestuff is a sulforhodamine.

The invention relates to a laser generator. That generator comprises optical resonant cavity of the folded type, limited by two plane mirrors arranged in a same plane, side by side and a corner cube reflector for sending back the radiation coming from one of the said mirrors towards the other mirror. Application to telemeters and to illuminators.

A laser amplifier and/or oscillator comprise a gain medium including rare earth dopant in an host medium. Ions of the rate earth dopant has an energy level structure including a ground level and a pair of laser upper level and laser lower levels between which a stimulated transition is to be produced after production of a population inversion between the pair of laser upper and laser lower levels. A first exciting light source is coupled to the gain medium for introducing first exciting light to...

An improved Q-switched laser and laser rod in which the threshold of double pulsing is significantly raised. In a Q-switched laser, the laser cavity includes a front mirror which is partially transmissive, a rear mirror element and a lasable rod like element positioned between the two mirrors. The rear mirror is controlled in such a manner that it sequentially presents reflective and nonreflective surfaces to the laser rod. This then prevents lasing action from occurring until such time as the r...

Laser telemeter comprising an attenuator a portion of which is placed on the trajectory of the pulses emitted by the laser and partially absorbs the energy of these pulses. This attenuator comprises several zones which are substantially centred on an axis, the absorbed fraction of the energy of a pulse being different for the various zones of the attenuator. That telemeter comprises also means for shifting that portion on the attenuator and means for driving the attenuator in a rotating movement...

A tunable laser is disclosed in which a plurality of laser beams different from one another in wavelength and polarization can be simultaneously oscillated. The tunable laser is advantageous among others in that an atomic absorption spectroscopic analysis can be carried out with very high sensitivity when it is used as, for example, a light source for two-wavelength measurement in the atomic absorption spectroscopic analysis.

A laser mirror resistant to thermal distortions produced by radiative heating and/or heating by other processes associated with high power CW lasers. A plurality of rods connect a flexible face portion to a stiff base portion to define an "elastic" arrangement which permits free lateral expansion but resists if not prevents distortion in the form of bending of the face portion. The face portion may be formed 1. from a block of heat conductive material which has been deeply slotted from its rear ...

A laser amplifier structure with the amplifying medium in the form of one or more, appropriately excited, orientated and fashioned, elongated slab segments. The laser radiation enters and leaves each of the slab segments via respective, adjacent polished faces which are parallel to the longest axis of each slab. A single laser beam or a sequence of laser beams equivalent to such a beam can be amplified.

Laser telemeter comprising a receiving photo-diode polarised in a break-down state and a servo-adjusting device regulating the polarisation voltage of that photo-diode at a level which may cause the triggering of a chronometer device receiving the pulses of that photo-diode. That telemeter comprises, moreover, a device for temporarily lowering that polarisation voltage during the interval of time separating the emission of a laser pulse and the receiving thereof on the photo-diode.

A laser gyroscope is disclosed wherein two pairs of waves propagating in opposite directions in a laser resonator are amplified by the laser medium of such resonator. The frequencies of such waves, which are all different, are maintained symmetrically about the center maximum gain frequency curve associated with the laser medium by operation of a pathlength stabilizer. Means are provided for combining a portion of each one of the waves in at least one of the pair of waves into a single composite...