Harmonic generator having cascaded crystals

Claim 2

A harmonic generator comprising a plurality of dielectric crystals each having an incidence plane and an exit plane which are parallel with each other, and control means coupled to at least one of said crystals to match the phase of an electromagnetic wave inciding perpendicularly upon the incidence plane of each crystal with the phases of the harmonics of said electromagnetic wave, characterized in that said crystals are disposed in cascade such that: the normal lines upon said incidence planes and said exit planes of said respective crystals are parallel with each other; and that the optical axes of adjacent ones of said crystals, as projected on the plane of incidence, intersect each other at right angles.

Claim 3

A harmonic generator comprising a plurality of dielectric crystals, each one of said crystals having an incidence plane and an exit plane which are parallel with each other and being cut such that normal lines upon said incidence planes and said exit planes intersect the optical axis of said crystal at a phase matching angle characterized in that, said crystals are disposed in cascade such that the normal lines upon said incidence planes And said exit planes of respective crystals are parallel with each other and that the optical axes of adjacent ones of said crystals, as projected on the plane of incidence, intersect each other at right angles.

Claim 4

A harmonic generator comprising a plurality of dielectric crystals, each one of said crystals having an incidence plane and an exit plane which are parallel with each other and being cut such that normal lines upon said incidence planes and said exit planes intersect the optical axis of said crystal at a phase matching angle characterized in that, said crystals are disposed in cascade such that the normal lines upon said incidence planes And said exit planes of respective crystals are parallel with each other and that the optical axes of adjacent ones of said crystals, as projected on the plane of incidence, intersect each other at right angles.

Claim 5

The harmonic generator according to claim 1 wherein said control means comprises means to apply a voltage across said crystals and means to control said voltage.

Claim 6

The harmonic generator according to claim 1 wherein said control means comprises means to heat said crystals and means to control the temperature of said crystals.

Claim 7

The harmonic generator according to claim 1 wherein said control means comprises means to heat said crystals, means to control the temperature of said crystals, means to apply a voltage across said crystals and means to control said voltage.

Claim 8

The harmonic generator according to claim 3 wherein said voltage control means comprises a variable resistor.

Claim 9

The harmonic generator according to claim 4 wherein said means to heat said crystals comprises an electric heater.

Claim 10

The harmonic generator according to claim 4 wherein said temperature control means comprises a thermistor.

Claim 11

The harmonic generator according to claim 5 wherein the phase matching of said crystals is effected by at least one of said means to apply and control the voltage and said means to heat and control the temperature of said crystals.

Claim 12

A harmonic generator comprising: at least a first nonlinear dielectric crystal, said first crystal being cut such that the incidence plane and the exit plane thereof are parallel with each other, and that a normal line upon said incidence plane and said exit plane intersects the optical axis of said crystal at a phase matching angle; at least a second nonlinear dielectric crystal having an incidence plane and an exit plane which are parallel with each other; and means coupled to the second crystal to control the second crystal such that the phase of the electromagnetic wave inciding perpendicularly upon the incidence plane of said second crystal matches with the phases of the harmonics of said electromagnetic wave; said crystals being disposed in cascade such that normal lines upon the incidence planes and exit planes of respective crystals extend parallel with each other and that the projections of the optical axes of adjacent ones of said crystals on their respective incidence planes intersect each other at right angles with respect to each other.

Claim 13

A harmonic generator comprising: at least a first nonlinear dielectric crystal, said first crystal being cut such that the incidence plane and the exit plane thereof are parallel with each other, and that a normal line upon said incidence plane and said exit plane intersects the optical axis of said crystal at a phase matching angle; at least a second nonlinear dielectric crystal having an incidence plane and an exit plane which are parallel with each other; and means coupled to the second crystal to control the second crystal such that the phase of the electromagnetic wave inciding perpendicularly upon the incidence plane of said second crystal matches with the phases of the harmonics of said electromagnetic wave; said crystals being disposed in cascade such that normal lines upon the incidence planes and exit planes of respective crystals extend parallel with each other and that the projections of the optical axes of adjacent ones of said crystals on their respective incidence planes intersect each other at right angles with respect to each other.

Claim 14

The harmonic generator according to claim 10 wherein at least one of said crystals is controlled by at least one of a means to apply heat and control the temperature of a crystal and means to apply voltage across the crystal and control said voltage.