Method and Device for Frequency Conversion and Amplification of Laser Radiation by Means of Nonlinear Media in Optical Resonators

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This invention provides a method and device for generating and amplifying laser light using a temperature-controlled solid-state optical setup that utilizes nonlinear media (such as specific crystals) placed in optical resonators. By setting different temperatures in specific sections of the nonlinear medium, the phase matching required for efficient nonlinear conversion and the resonator's optical length (which affects resonance conditions for various wavelengths) can be independently optimized, without the need for piezoelectric actuators. This enables precise and efficient frequency conversion (such as frequency doubling or parametric generation) and amplification of laser light, all within a compact and stable design.

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• Generation of laser light at wavelengths not directly accessible with standard lasers, such as ultraviolet (UV) or mid-infrared (mid-IR), by frequency conversion.
• Highly efficient optical parametric oscillators (OPOs) for research, metrology, and quantum optics.
• Compact and stable laser modules for biomedical imaging, spectroscopy, or materials processing.
• Generation of frequency-mixed light for telecommunications, LIDAR, or scientific instrumentation.
• Production of squeezed or entangled light for quantum information and quantum sensing.

BenefitsContent extracted from patent full text and abstract with AI.

• Enables independent control of phase matching and cavity resonance via temperature, leading to improved efficiency and flexibility.
• Eliminates the need for noisy and bulky piezoelectric actuators, resulting in more compact, robust, and low-noise laser setups.
• Supports compact, monolithic designs, simplifying manufacturing and improving mechanical stability.
• Allows simultaneous resonance of multiple laser wavelengths, boosting frequency conversion rates and output power.
• Adaptable control (static or dynamic) accommodates shifting laser frequencies, maintaining optimal performance during operation.

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Patent Abstract

An apparatus and a method for generating laser radiation by means of a temperature-controlled optical setup, comprising an optical nonlinear solid-state medium, arranged in a resonator, with an active region, wherein, with the assistance of constructive interference, pump radiation introduced into the solid-state medium generates emanated laser radiation, characterized by adapting the phases of the generated wavelengths, which are involved in the generation of the laser radiation, by setting a first temperature within a first portion of the active region and adapting the resonator length by setting a second temperature within a second portion of the active region.