30results about How to "Improve optical conversion efficiency" patented technology

The invention discloses a Terahertz radiation source based on an optical parameter effect and an optical difference frequency effect. The Terahertz radiation source comprises a pumping source, a telescope beam shrinking system, a first reflecting mirror, a first optical beam scanner, a resonant cavity consisting of two optical glasses, a reflecting mirror group and a second optical beam scanner. A MgO:LiNbO3 crystal is arranged in the resonant cavity, and a silicon prism is arranged on the side face of the MgO:LiNbO3 crystal. The Terahertz radiation source is simple in structure, and the parameter process and the difference frequency process can be achieved at the same time in the low-cost MgO:LiNbO3 crystal. The acquiring mode of two difference frequency beams in the difference frequency process is simple, and the entire system is compact in structure, good in stability and low in cost. The incident angle of pumping light is changed by changing the direction of the optical beam scanners, so that the included angle of the pumping light and the axis of a Stokes optical resonant cavity is changed, and thus frequency tuning output of THz waves can be achieved. The tuning mode is simple, and operation is flexible. The pumping light is recycled, due to the fact that the optical parameter process and the optical difference frequency process are achieved at the same time, the output power of the THz waves can be effectively improved, and the optical conversion efficiency of the THz waves is improved.

The invention discloses a quasi-phase-matching terahertz wave parametric oscillator, which includes a pump source, a first period inversion GaP crystal, a second period inversion GaP crystal, a third period inversion GaP crystal, and a fourth period inversion GaP crystal, and the reflection mirrors arranged around the GaP crystal of the first period inversion, the GaP crystal of the second period inversion, the GaP crystal of the third period inversion and the GaP crystal of the fourth period inversion, the reflection mirror includes the first reflection mirror, A second reflector, a third reflector, a fourth reflector, a fifth reflector, a sixth reflector, a seventh reflector, an eighth reflector, a ninth reflector, and a tenth reflector. The generated Stokes light oscillates back and forth in the ring resonator, which can effectively amplify the THz wave through the optical parametric effect; the collinear interaction between the pump light and the Stokes light effectively increases the interaction volume between the pump light, the Stokes light and the THz wave.

The invention discloses an optical parameter generator for generating multiple beams of terahertz waves, which includes a pump source, a period inversion GaP crystal, a first reflection mirror and a second reflection mirror; The direction of the negative axis at an angle of 45° and the direction of the negative Y axis at an angle of 45° is perpendicular to the period-inverted GaP crystal, and after propagating for a certain distance in the period-inverted GaP crystal, it is on the Y-Z plane of the period-inverted GaP crystal Total reflection, then incident on the X-Z plane of the period inversion GaP crystal for total reflection, and then vertically emerge from the surface of the period inversion GaP crystal, the pump light emitted from the period inversion GaP crystal passes through the first reflector and the second The total reflection of the two mirrors forms the first cycle of the pump light. The terahertz wave is emitted perpendicular to the period inversion GaP crystal, without any coupling output device, which effectively reduces the output loss of the terahertz wave.

The present invention relates to a terahertz radiation source based on inner cavity optical parameters and difference frequency effect, including a pump light source, a first KTP crystal 9 , a second KTP crystal 10 , and a periodically polarized crystal 12 . The pumping light pumps the optical parametric oscillator composed of double KTP crystals to generate two beams of difference frequency light. The two beams of difference frequency light are incident on the periodically polarized crystal 12, and terahertz is generated based on the optical difference frequency effect in the difference frequency optical resonant cavity. Wave. The two beams of difference frequency light can be respectively used as pump light to respectively excite the periodically polarized crystal 12, and a cascaded optical parametric effect occurs in the difference frequency optical resonant cavity to generate terahertz waves. During the entire terahertz wave generation process, the difference frequency light can excite the periodically polarized crystal 12 to generate terahertz waves through the cascaded optical parametric effect, and one pump photon can generate multiple terahertz photons, effectively improving the output energy and Optical conversion efficiency.

The invention discloses a dual-frequency terahertz wave parametric oscillator, comprising a KD*P crystal, a polarizer, a laser pumping module, a GaAs crystal, and a reflector and a paraboloid mirror arranged around the GaAs crystal. A pump source is provided by a first mirror, second mirror, third mirror, Fourth mirror, fifth mirror, a sixth mirror, a seventh mirror, an eighth mirror, a KD*P crystal, a polarizer, and a laser pumping module. The pumping light emitted from the pumping source is resonantly amplified in a resonant cavity composed of a first mirror, a second mirror, a third mirror,a fourth mirror, a fifth mirror, a sixth mirror, a seventh mirror, and an eighth mirror. In the process of optical parameters, Stokes light and pump light in the cavity can be recycled, and the efficiency of pump light can be improved effectively. Four THz waves are emitted perpendicular to GaAs crystal, and no coupling device is needed to reduce the loss of THz wave.

The invention discloses a three-dimensional terahertz wave parametric oscillator, comprising a pump source, a GaAs crystal, a mirror and a paraboloid mirror arranged around the GaAs crystal; The pumpsource is made up of KD*P crystal, Polarizer, Nd: A YAG laser pumping module is composed of a first mirror, a second mirror, a third mirror, a fourth mirror, a fifth mirror and a sixth mirror. The pumping light emitted from the pumping source is resonantly amplified in a resonant cavity composed of a first mirror, a second mirror, a third mirror, a fourth mirror, a fifth mirror and a sixth mirror.In the process of optical parameters, Stokes light and pump light in the cavity can be recycled, and the efficiency of pump light can be improved effectively. Six terahertz waves can be generated byone pump beam, and the optical conversion efficiency is effectively increased.

A high-efficiency teraHertz wave parametric oscillator comprises a pumping source and a periodic reversal GaP crystal and a reflection source. The pumping source performs circulating pumping of the periodic reversal GaP crystal to generate Stokes light and THz waves through adoption of quasi-phase-matching optical parameter effect. The generated multi-beam Stokes light and the pump light to perform collinear spreading, and the generated multi-beam THz waves are perpendicular to the surface of the periodic reversal GaP crystal for emission. In the optical parameter process, the Stokes light andthe pump light are circularly used so as to effectively improve the pump light utilization efficiency. The generated THz waves are perpendicular to the surface of the periodic reversal GaP crystal for emission with no need for any coupled output device so as to effectively reduce the THz output loss. One beam of pump light can generate multiple beams of THz waves to effectively improve the optical conversion efficiency.

The invention discloses a ring cavity terahertz wave parametric oscillator, comprising a pump source, a first reflector, a second reflector, a third reflector, a fourth reflector, a first MgO:LiNbO 3 Crystal, the second MgO:LiNbO 3 Crystal, the third MgO:LiNbO 3 Crystal, the fourth MgO:LiNbO 3 Crystal, fifth MgO:LiNbO 3 Crystal and sixth MgO:LiNbO 3 crystals. The four beams of terahertz waves generated by the optical parametric effect, of which two beams of terahertz waves can be used as seed light to enhance the optical parametric effect, and then can effectively amplify the other two beams of terahertz waves; Stokes light is resonantly amplified in the ring cavity, and can be repeated Use to effectively improve optical conversion efficiency; terahertz waves are perpendicular to MgO:LiNbO 3 The output from the crystal does not require any coupling output device, which effectively reduces the output loss of the terahertz wave; by changing the angle between the pump light and the Stokes light, a frequency-tuned terahertz wave can be obtained. The tuning method is simple and the operation is flexible.

The invention discloses a ring cavity terahertz wave parametric oscillator, which comprises a pump source, a GaP crystal and reflecting mirrors arranged around the GaP crystal, wherein the pump sourceis composed of a KD*P crystal, a polarizer, an Nd:YAG laser pumping module, a first reflecting mirror and a second reflecting mirror; and the pump light oscillating back and forth shoots into the GaPcrystal and generates four beams of Stokes light and four beams of terahertz waves through an optical parametric effect, the four beams of Stokes light are respectively first Stokes light, second Stokes light, third Stokes light and fourth Stokes light, and the four beams of terahertz waves are respectively first terahertz beams, second terahertz beams, third terahertz beams and fourth terahertzbeams. In the optical parametric process, the Stokes light and the pump light in the cavity can be recycled, and thus the utilization efficiency of the pump light is effectively improved.

A multipolarized periodic terahertz wave parametric oscillator includes a pump source, a multipolarized periodic PPLN crystal, and a first parabolic mirror and a second parabolic mirror arranged on both sides of the multipolarized periodic PPLN crystal. Stokes (Stokes) light and terahertz (THz) waves are generated by optical parametric effect in PPLN crystals pumped by reciprocating pump (pump) light. The generated Stokes light oscillates back and forth in the ring resonator and amplifies the THz wave through the optical parametric effect. The generated THz wave emits perpendicularly to the surface of PPLN crystal. In the process of optical parameters, Stokes light and pump light can be recycled to improve the utilization efficiency of pump light. The generated THz wave is emitted perpendicular to the surface of PPLN crystal, and no coupling device is needed to reduce the THz wave output loss.

The invention relates to a cascaded optical frequency converter based on a monolithic phosphate crystal and application of the cascaded optical frequency converter. The optical frequency converter comprises a first beam splitter, a phosphate crystal, a polarization conversion module, a second beam splitter and a third beam splitter which are arranged in the direction of an optical path. The cascaded optical frequency converter takes the phosphate crystal as a nonlinear optical medium, changes the polarization state of frequency doubled light through a quarter-wave plate, performs cascaded frequency converting between frequency doubling and frequency tripling through a turn-back light path, and realizes the direct output from near-infrared laser to ultraviolet laser in one crystal; the phosphate crystal has the advantages of low material cost, high easiness in growth, large size and good quality; as within a 1 micrometer wave band, the phase matching directions of class II frequency doubling and class II frequency tripling of the phosphate crystal are basically the same, the light conversion efficiency is high.

The invention discloses a nested coupling terahertz wave parameter oscillator. The nested coupling terahertz wave parameter oscillator comprises a KD*P crystal, a polarization plate, a Nd: YAG laser pumping module, a GaAs crystal and reflectors arranged around the GaAs crystal; the pumping source is composed of the KD*P crystal, the polarization plate, the Nd: YAG laser pumping module and a firstreflector, a second reflector, a third reflector, a fourth reflector and a fifth reflector; and the pumping light emitted by the pumping source is resonated and amplified in a resonant cavity definedby the first reflector, the second reflector, the third reflector, the third reflector and the fifth reflector. In the optical parameter process, the Stokes light and the pump light in the cavity canbe recycled, so that the pump light utilization efficiency is effectively improved; and four beams of THz waves are perpendicular to the GaAs crystal to emit, so that no coupling output device is needed, and terahertz wave output loss is effectively reduced.