Characterization of non-linear optical materials using bragg coupling

A method of characterizing a non-linear optical material comprising a waveguide layer, wherein the waveguide layer comprises a plurality of periodically poled domains and at least one waveguide region, the method comprising:

• coupling at least one diagnostic laser beam into the at least one waveguide region at one or more input locations positioned on the waveguide layer of the non-linear optical material;
• out-coupling the diagnostic laser beam from the at least one waveguide region by applying an electric field to the periodically poled domains at one or more output locations positioned on the waveguide layer of the non-linear optical material;
• measuring an intensity level of the out-coupled beam;
• adjusting an input angle θI, wherein the input angle θI is the angle of the diagnostic laser beam relative to the non-linear optical material at the input location;
• determining an optimal input angle θOI based at least in part on the measured intensity level of the out-coupled beam;
• and
• determining a center wavelength λcw of the waveguide region based at least in part on the optimal input angle θOI.

A method of characterizing a non-linear optical material comprising a waveguide layer, wherein the waveguide layer comprises a plurality of periodically poled domains and at least one waveguide region, the method comprising:

• coupling at least one diagnostic laser beam into the at least one waveguide region at one or more input locations positioned on the waveguide layer of the non-linear optical material;
• out-coupling the diagnostic laser beam from the at least one waveguide region by applying an electric field to the periodically poled domains at one or more output locations positioned on the waveguide layer of the non-linear optical material;
• measuring an intensity level of the out-coupled beam;
• coupling the diagnostic laser beam into the at least one waveguide region at an input angle θI;
• adjusting an azimuthal input angle φI of the diagnostic laser beam relative to the periodically poled domains by rotating the non-linear optical material;
• determining an optimal azimuthal input angle φI based at least in part on the measured intensity level of the out-coupled beam;
• and
• determining a center wavelength λcw, of the waveguide region based at least in part on the input angle θI and the best azimuth input angle φOI.

A method of characterizing a non-linear optical material comprising a waveguide layer, wherein the waveguide layer comprises a plurality of periodically poled domains and at least one waveguide region, the method comprising:

• coupling at least one diagnostic laser beam into the at least one waveguide region at one or more input locations positioned on the waveguide layer of the non-linear optical material;
• out-coupling the diagnostic laser beam from the at least one waveguide region by applying an electric field to the periodically poled domains at one or more output locations positioned on the waveguide layer of the non-linear optical material;
• measuring an intensity level of the out-coupled beam;
• adjusting the wavelength of the diagnostic laser beam;
• determining an optimal wavelength of the diagnostic laser beam λO based at least in part on the measured intensity level of the out-coupled beam;
• and
• determining a center wavelength λcw of the waveguide region based at least in part on the optimal wavelength λO.

A method of characterizing a non-linear optical material comprising a waveguide layer, wherein the waveguide layer comprises a plurality of periodically poled domains and at least one waveguide region, the method comprising:

• coupling at least one diagnostic laser beam into the at least one waveguide region at one or more input locations positioned on the waveguide layer of the non-linear optical material;
• out-coupling the diagnostic laser beam from the at least one waveguide region by applying an electric field to the periodically poled domains at one or more output locations positioned on the waveguide layer of the non-linear optical material;
• measuring an intensity level of the out-coupled beam;
• coupling the diagnostic laser beam into the at least one waveguide region at an input angle θI;
• adjusting a temperature of the non-linear optical material;
• determining an optimal temperature of the non-linear optical material based at least in part on the measured intensity level of the out-coupled beam;
• and
• determining a center wavelength λcw, of the waveguide region at the optimal temperature.

A method of characterizing a non-linear optical material comprising a waveguide layer, wherein the waveguide layer comprises a plurality of periodically poled domains and at least one waveguide region, the method comprising:

• coupling at least one diagnostic laser beam into the at least one waveguide region at one or more input locations positioned on the waveguide layer of the non-linear optical material;
• out-coupling the diagnostic laser beam from the at least one waveguide region by applying an electric field to the periodically poled domains at one or more output locations positioned on the waveguide layer of the non-linear optical material;
• adjusting the frequency of the diagnostic laser beam;
• measuring a green power intensity level of the out-coupled beam;
• determining an optimal frequency of the diagnostic laser beam based at least in part on the measured green power intensity level of the out-coupled beam;
• and
• determining the conversion efficiency of the waveguide region based at least in part on the optimal frequency of the diagnostic laser beam.