Spatiotemporal Mode-Locked Laser for High Peak Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mode-locked lasers primarily lock different longitudinal modes in a single transverse mode, limiting the participation of higher transverse modes and resulting in lower laser pulse energy and power, as well as restricted management of optical nonlinearities.
Innovation Solution
The technology enables mode locking of both selected longitudinal and transverse modes in a spatiotemporal mode-locked laser, utilizing an optical resonator with an optical gain medium, attenuation device, spectral filter, and spatial filter to achieve comparable dispersion in both modes, allowing for higher peak power and unique management of optical nonlinearities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional mode-locked lasers lock only different longitudinal modes in a single transverse mode, then the laser structure is simpler and easier to control, but the laser pulse energy and power are limited
Solution Approach 1:
The patent transitions from conventional single-transverse-mode mode-locking to spatiotemporal mode-locking that simultaneously controls both longitudinal and transverse modes. This adds a spatial dimension (transverse mode control) to the traditional temporal mode-locking approach, enabling higher pulse powers by utilizing multiple transverse modes while maintaining controllable laser operation through integrated spatiotemporal cavity design
2Power
If higher transverse modes are excluded from mode locking, then the optical resonator is easier to manage, but the laser pulse energy is reduced
Solution Approach 1:
The optical resonator is designed to simultaneously support and control multiple functions: it accommodates both longitudinal and transverse mode propagation while integrating dispersion management for both mode types. The cavity structure enables universal operation across multiple mode families, allowing higher pulse energies by harvesting energy from different transverse modes while maintaining unified control mechanisms
3Shape
If only longitudinal modes are locked in phase, then the phase control mechanism is simpler, but the electromagnetic field profile is limited to 2-dimensional characteristics
Solution Approach 1:
The patent extends phase locking from only longitudinal modes to include both longitudinal and transverse modes, creating a three-dimensional electromagnetic field profile. This spatiotemporal phase control locks modes in both spatial (transverse) and temporal (longitudinal) dimensions, producing complex 3D field structures while integrating dispersion management for both longitudinal and transverse mode dispersions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach generates laser pulses with higher peak power and unique 3-dimensional electromagnetic field profiles, enabling the participation of multiple modes and advanced management of optical nonlinearities, suitable for applications requiring high peak power and the study of nonlinear optical processes.
Implementation Method 1
an optical gain medium in the optical resonator to produce optical gain for light at a wavelength within a gain spectral range covering different laser wavelengths
Implementation Method 2
an optical attenuation device located in the optical resonator and structured to attenuate light in the longitudinal and transverse optical modes and structured to exhibit a saturation in optical attenuation as an optical intensity increases
Implementation Method 3
an optical spectral filter located in the optical resonator to select light in certain optical modes within a bandpass spectral range to transmit and to circulate in the optical resonator while filtering out light in other optical modes
Implementation Method 4
an optical spatial filter located in the optical resonator to select certain transverse optical modes to transmit and to circulate in the optical resonator while spatially blocking other transverse optical modes from being present in the optical resonator
Implementation Method 5
an optical resonator structured to support longitudinal optical modes and transverse optical modes and to provide optical feedback for light to circulate in the optical resonator
Data Source
AI summary
The technology disclosed in this patent document allows mode locking of both selected longitudinal and transverse modes to produce laser pulses. The laser light produced based on such mode locking exhibits a 3-dimensional mode profile based on the locked longitudinal and transverse modes.