38 results about "Ti:sapphire laser" patented technology

The invention discloses a semiconductor laser-pumped kerr lens mode-locked titanium sapphire laser, which comprises first semiconductor lasers, a resonant cavity, an interferometer and a feedback regulation unit, wherein the first semiconductor lasers are used for emitting continuous laser light of blue and green bands to pump titanium sapphire crystal in the resonant cavity; the resonant cavity is used for carrying out oscillating and mode locking on the laser light of near-infrared bands to output femtosecond pulse laser light; the interferometer is used for driving the femtosecond pulse laser light to generate a beat note signal to obtain a carrier-envelope offset frequency; and the feedback regulation unit is used for regulating front and back positions and gradients of end mirrors ofthe resonant cavity and the power of the laser light output by the semiconductor lasers, thereby keeping the stability of a repetition frequency and the carrier-envelope offset frequency. An ultrashort laser light pulse with stable repetition frequency and carrier-envelope offset frequency can be output, and the semiconductor lasers are directly adopted as pumping sources, so that the cost of thelasers is greatly reduced, and the volume of the whole lasers is further reduced.

The invention discloses a multi-mode quantum light source realization device based on a four-wave mixing process in rubidium vapor. Laser emitted by a titanium sapphire laser device sequentially passes through a 1/2 wave plate and a polarization beam splitter and then is divided into a first laser beam and a second laser beam; the first laser beam is sequentially emitted into an acoustic optical modulator and a 1/4 wave plate and then is sequentially reflected back to the acoustic optical modulator, and passes through a single-mode optical fiber to generate probe light; the second laser beam sequentially passes through the single-mode optical fiber, the 1/2 wave plate, the polarization beam splitter, the 1/4 wave plate and a conical prism to generate pumping light; the probe light and the pumping light are subjected to a four-wave mixing reaction in a rubidium tank to generate conjugate light; the pumping light is eliminated by a Glan-Thompson prism and the probe light penetrates through a punching reflection mirror; the conjugate light is reflected by the punching reflection mirror; the probe light and the conjugate light are input into different detectors respectively, and electric signals output by the detectors pass through a subtractor and then are connected to a frequency spectrum analyzer, and then are analyzed to obtain quantum squeezing. With the adoption of the multi-mode quantum light source realization device, an ultra-large-size multi-mode quantum state is realized by using degree of spatial freedom.

The invention provides a femtosecond laser plasma channel length measuring device and method. The device includes a Ti sapphire laser, a focusing lens, a metal Faraday cage, a light beam collecting device, a high voltage power source, an organic glass substrate, an insulation plastic rod, a metal conical electrode and a digital camera. According to the invention, femtosecond laser filamentation is utilized for inducing corona discharge, the inner ionization degree of a femtosecond laser plasma channel is intensified by using an electric field, so that a weak ionization area which is not easy to detect becomes easy to detect under the effect of the electric field. Besides, the digital camera is used for taking fluorescent pictures showing that laser induces corona discharge, so that precise measurement of the femtosecond laser plasma channel is realized. The device is simple and practical and can be used for measuring the length of the femtosecond laser plasma channel directly. The method which is more accurate, simple and convenient is provided for femtosecond laser plasma length measurement.

The invention provides a Nd:YCOB crystal micro-disc self-doubling-frequency green laser, belonging to the element field. The Nd:YCOB crystal has the nonlinear effect and has a general expression of Ndxy(1-x)Ca4o(BO3)3, where x ranges from 0.001 to 0.2. The crystal takes the YCOB as the ground mass and takes an LD or a Ti:sapphire laser as a pump source; the crystal makes Nd ions to generate the laser oscillation with 1.06 mu m and generates green output by the YCOB crystal nonlinear effect. The micro-disc self-doubling-frequency green element made of the crystal has the characteristics of simple and compact structure, small volume, small consumption, good stability, high transfer efficiency, good beam quality, simple operation, low cost, etc. Moreover, the laser can realize the miniaturization, the integration and the practicability and is convenient for the industrialized mass production.

The invention discloses a transmission cavity frequency stabilizing system and method for realizing long-term laser frequency stabilization and belongs to the field of precise laser frequency stabilization. The frequency stabilizing system mainly comprises a plurality of Ti-doped sapphire lasers, reference cavities, control boxes, a reference laser (helium-noon laser) with stable frequency, a polarization beam splitter, a Fabry-Perot transmission cavity, a photoelectric detector, a function signal generator, an adder, a data acquisition card, a computer and the like. The frequency stabilizing method comprises steps as follows: firstly, two Ti-doped sapphire lasers are locked on the respective reference cavities, and then the reference cavities are locked on the reference laser with stable frequency, so that two Ti-doped sapphire lasers with laser line width smaller than 100 kHz and long-term frequency drift smaller than plus/minus 1 MHz are obtained. The system and the method have the advantages that only one reference laser is used for locking the plurality of Ti-doped sapphire lasers with frequency to be stabilized simultaneously and can lock the Ti-doped sapphire lasers at any frequency within the tunable range, and the extensibility and the frequency stability are very high.

A thulium holmium co-doped barium lanthanum gallate laser crystal, manufacturing method and application thereof, the chemical formula of the crystal is: Tm, Ho: BaLaGa ₃ o ₇ , belonging to the tetragonal crystal system, the space group is The crystals are based on BaCO ₃ , La ₂ o ₃ , Ga ₂ o ₃ , Tm ₂ o ₃ and Ho ₂ o ₃ The raw material is grown according to the pulling method, and the crystal is used in a solid-state laser as a laser working substance, and a laser diode or a Ti:sapphire laser is used as a pump source to generate continuous, tunable and ultrashort pulse laser output in the 2μm band. Thereby realizing 2μm band laser emission.

The invention relates to a 765nm-780nm pulse laser for Raman spectrum analysis, comprising a 980nm laser diode (101) and an end face pumping laser gain medium (103), a resonant cavity is composed of a reflecting mirror (102) and an output mirror (105), 1520nm-1560nm fundamental frequency light is generated and carries out resonance in the resonant cavity through a frequency doubling crystal (104), pulse laser (109) with 760nm-780nm wavelength is output, and the needed wavelength (110) is output through an pulse laser coupling system (106). In the invention, laser glass is used as laser gain medium, the stability of the laser is improved, the price is low, and the price of the whole system is only one fifth of that of the traditional Ti-sapphire laser, and the laser is mainly used for the low-power portable Raman spectrum analyzers.

The invention provides a broadbandTi:sapphire tunable Raman laser. According to the broadband Ti:sapphire tunable Raman laser, a green laser is composed of a laser total-reflection mirror, an acousto-optic Q switch, a semiconductor laser module, a harmonic wave sheet, a frequency doubling crystal and a green laser output mirror. An LDA pump laser gain material is used for generating 1064mm laser. A 532mm laser is generated through the frequency doubling crystal. Pumping is conducted by the 532mm laser on a Ti:sapphire crystal, so that 1000nm-1100nm wave length is generated. A Raman reflecting mirror and a Raman output mirror constitute a resonance cavity. The laser generates simulated Raman scattering under the feedback action of the resonance cavity after passing through a Raman crystal. Through selection of a prism pair and a reflecting mirror, the wave length continuous tunable function is achieved. After the laser passes through the Raman crystal, due to the Raman effect, the frequency shift function is achieved. Finally, long wave length beyond the spectral line of emission of the Ti:sapphire laser is output. The broadband Ti:sapphire tunable Raman laser expands the output wave length range of the Ti:sapphire laser.

The invention discloses an asymmetric quantum interferometer and method. Coherent light such as a semiconductor laser or a titanium sapphire laser is used as an initial incident light source, and theasymmetric quantum interferometer is realized based on a high-gain raman scattering process between the light and a substance. An experimental device is mainly an action medium and comprises two coherent light sources P, a raman light field W, a batch of optical components and a phase shifter. The whole device is simple in structure and stable in system. According to the asymmetric quantum interferometer in the invention, the high-gain raman scattering process is used as a beam splitter to realize beam splitting and beam combination of light and atoms, the interference output strength is in asymmetric and similar sawtooth wave pattern distribution along with the phase difference of two interference arms, and the signal strength at certain phases is very sensitive to phase change. Comparedwith the traditional all-optical interferometer and the symmetric nonlinear interferometer, the asymmetric quantum interferometer has higher phase sensitivity. The interferometer has an important application prospect in the field of precision measurement and quantum information.

The invention relates to the field of optical phase-locked loops and provides a 10MHz-10GHz optical phase-locked loop device. The device includes a titanium-doped sapphire laser (1), a semiconductor laser (2), a high-bandwidth photoelectric detector (3), a radio frequency power beam splitter (4), a spectrum analyzer (5), a high-frequency signal generator (6), a frequency mixer (7), a radio frequency power amplifier (8), a signal generator (9), an optical phase-locked loop module (10), and an oscilloscope (11). The device can make the frequency difference between the two lasers fixed in the range of 10MHz to10GHz, and the device can stably and continually work and is less affected by the external environment.

The invention discloses a Kerr lens self-mode-locked titanium sapphire laser based on novel blue laser diode pumping, Its structural features are: The novel blue laser diode-pumped Kerr lens self-mode-locked titanium sapphire laser comprises a blue laser diode, an aspherical lens, a cylindrical concave lens, a cylindrical convex lens, a 450 nm high-reflector, a plano-convex focusing mirror, a concave mirror, a titanium sapphire crystal, a coupling output mirror, a fused silica triprism and a laser high-reflector. The laser diode has the advantages of small volume, simple structure, high stability, low cost and the like, and is used for replacing the pump source of the traditional titanium sapphire femtosecond oscillator-all-solid-state frequency doubling laser. Therefore, the novel blue laser diode-pumped Kerr lens self-mode-locked Ti: sapphire laser provided by the invention has the advantages of compact, simple structure, stable operation, low cost and the like.

The invention relates to a continuously tunable Ti sapphire laser covering all gain spectral lines and a method thereof. The continuously tunable Ti sapphire laser comprises a pumping source, a telescope system, an optical resonant cavity, a Ti sapphire crystal and a birefringent filter. The laser beams emitted by the pumping source act on a titanium sapphire crystal in the optical resonant cavityafter being focused by the telescope system, fluorescence is generated in the stimulated radiation process of titanium sapphire, laser is generated in the mode selection and amplification process ofthe optical resonant cavity, and the laser is oscillated in the optical resonant cavity and then is transmitted by a second plane mirror to form the laser output. Meanwhile, a motor controller drivesa motor to drive a rotary table to adjust the included angle between the projection of the optical axis of the birefringent filter on the light passing surface and the laser incident surface, scanningis conducted from the starting angle of 18.4 degrees to 36.2 degrees, and therefore the output laser covering all gain spectral lines is obtained. According to the invention, the uniform and continuous 700-1000nm wavelength tuning can be realized under the condition of not changing the interference level, and the operation stability of the laser is not influenced.

The invention discloses a single-beam near-degenerate four-wave mixing microscope device and method, and the method comprises the steps: carrying out the dispersion compensation of a laser pulse transmitted by a Ti sapphire laser through a pair of prisms, cutting off the laser pulse at 781nm through an ultra-steep long-pass filter, reflecting the laser pulse through a dichroscope, and focusing thelaser pulse on a to-be-measured sample through an objective lens; a reflection signal on a to-be-detected sample is collected by the objective lens, sequentially penetrates through the dichroscope and the band-pass filter and then is guided into the first photomultiplier; transmission signals on a sample to be detected are gathered through the condensing lens and then are divided into a transmission light beam and a reflection light beam through the beam splitter, incident laser of the transmission light beam is filtered out through the first ultra-steep short-pass filter, and then the transmission light beam is focused through the lens and guided into the high-resolution integrated spectrograph to record spectral data. And the reflected light beam is reflected by the reflector, then filtered by the second ultra-steep short-pass filter and finally guided into the second photomultiplier for four-wave mixing imaging. The method has the advantages of being simple, cheap and easy to operate.

The present invention relates to an all-solid double-frequency laser light knife for operation to cure ametiopia. Said invention is formed from laser, scanning ascillatory mirror controlled by computer and laser output system, and is characterized by adopting solid baser pump, using titanium jewel laser to make gain and utilizing double-frequency crystal two-stage frequency multiplication to output laser whose wavelength is near 208 nm, and transferring said laser into scanning oscillatory mirror. Said invented product is safe, reliable, and good in therapeutic effect, and its stability is greatly raised, its structure is simple and cost is greatly reduced.

The invention provides a device and method for preparing a two-component continuous variable high-order orbital angular momentum entangled state, and the device comprises a Ti sapphire laser, a reflector, an optical beam splitter, a half-wave plate, an electro-optical modulator, a high-frequency signal generator, a filter, a lens group, a Glan laser prism, a cesium atom pool, a Glan-Thompson prism, a light beam collector, a balanced zero-beat detector, an adder-subtractor and a spectrum analyzer. According to the device, the continuous variable high-order orbital angular momentum entangled state with the maximum entanglement degree of-3.8 dB can be obtained, the device is stable in performance and compact in structure, and commercialized production can be achieved. The cesium atom D1 line transition frequency corresponds to a quantum dot exciton emission region of indium arsenide. The generated two-component continuous variable high-order orbital angular momentum entangled state light source corresponding to the cesium atom D1 line transition frequency can be applied to the fields of coherent interface research based on atoms and a solid-state system, quantum precision measurement and the like.