Chalcone Laser Gain Media for Tunable ASE Without a Resonator
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Solution Overview
Problem
Current laser media are limited in their ability to function in both liquid and solid states and lack tunability across various wavelength ranges, particularly below 570 nm, and are not capable of operating in both pulsed and continuous wave modes.
Innovation Solution
A laser device utilizing a gain medium with a chalcone compound derivative dissolved in solvents such as ethylene glycol and acetone, which emits lasers via amplified spontaneous emission (ASE) without an optical resonator, allowing for tunability across 525-580 nm and operation in both pulsed and continuous wave modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional laser media (rhodamine 6G, rhodamine B) are used, then continuous wave operation is achieved, but the operating range is limited to 550-630 nm and solid state function is poor
Solution Approach 1:
The patent modifies the molecular structure of chalcone compounds by introducing N,N-dimethylamino groups at the para position of ring B, which changes the photophysical parameters to achieve broader wavelength operation (525-580 nm) while maintaining stable performance in both liquid and solid states
Solution Approach 2:
The patent creates composite laser media by combining chalcone derivatives with various solvents (ethylene glycol, acetone, ethanol, dimethylformamide) to achieve optimal performance characteristics for different operating conditions, enabling both continuous wave and pulsed modes across expanded wavelength ranges
2Reliability
If N,N-dimethylamino chalcone derivatives are used, then photophysical properties are improved, but manufacturing complexity increases
Solution Approach 1:
The synthesis process is divided into separate steps: first preparing the chalcone base structure, then introducing the N,N-dimethylamino group at the para position of ring B. This segmentation allows for better control over the synthesis process and simplifies the overall manufacturing complexity while maintaining the desired photophysical properties
3Ease of operation
If optical resonator is used in laser device, then laser oscillation is achieved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the optical resonator component from the laser device, relying instead on the high optical gain properties of the chalcone derivative gain medium to achieve laser oscillation through amplified spontaneous emission alone, thereby simplifying the overall device structure while maintaining operational effectiveness
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
The solution provides a high optical gain and tunable laser emission across a range of 525-580 nm, enabling efficient and versatile laser operation in both liquid and solid states, with the compound 1-(2H-1,3-benzodioxol-5-yl)-3-[4-(dimethylamino)phenyl]-(2E)-propen-1-one (BDP) demonstrating significant optical gain and stability in pulsed and continuous-wave modes.
Implementation Method 1
The gain medium is configured to receive energy to emit a laser via amplified spontaneous emission (ASE)
Implementation Method 2
Through intramolecular charge transfer (ICT), the N,N-dimethyl amino group linked to the para-position of ring B in chalcones improves its photophysical properties
Implementation Method 3
a pump source is configured to provide actinic energy to the gain medium so that the gain medium is excited to emit the laser
Data Source
AI summary
A laser device includes a medium container, a gain medium contained in the medium container and optics configured to direct the laser to a sample. The optics preferably include no optical resonator around the gain medium. The gain medium is configured to receive energy to emit a laser and includes a first solvent and a compound dissolved therein. The compound conforms to formula (1):where R1, R2, R3, R4, R5 and R6 are each independently hydrogen or an alkyl group. The laser media can function in both liquid as well as solid state and has shown a high optical gain of the order of 3.2 cm−1 in pulsed and continuous wave modes.