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

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 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 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.

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.