研究目的
Investigating the use of photonic crystal spatial filters to improve the beam spatial quality and increase the brightness of emitted radiation in broad aperture semiconductor lasers.
研究成果
The study successfully demonstrated spatial filtering in broad area semiconductor lasers using PhC spatial filters in an extended cavity configuration, leading to a decrease in the M2 value and an increase in brightness. This proof of principle opens the way for future technological implementation of compact intracavity PhC spatial filtering in high-power emission regimes.
研究不足
The study was limited by the technological challenges of integrating PhC structures directly into the BAS laser cavity in a monolithic configuration. The current demonstration uses an extended-cavity configuration as a proof of principle.
1：Experimental Design and Method Selection:
The study employed an extended-cavity configuration to mimic the action of a more compact cavity, incorporating photonic crystal (PhC) spatial filters inside the laser cavity to test their filtering capabilities.
2：Sample Selection and Data Sources:
A broad aperture semiconductor (BAS) laser of 400 μm transverse width and 1500 μm length, emitting at 970 nm, was used. PhC samples were fabricated via a femtosecond laser writing technique in the bulk of a glass substrate.
3：List of Experimental Equipment and Materials:
The setup included cylindrical lenses for collimation, a BAS laser, PhC filters, and a CCD camera for beam profile recording.
4：Experimental Procedures and Operational Workflow:
The PhC filters were inserted into the laser cavity, and the effect on the beam's far-field distribution was recorded. The spatial quality of the beam was quantified by measuring the beam quality factor (M2) and brightness.
5：Data Analysis Methods:
The beam diameter was determined using the D4σ method, and the M2 factor was calculated from the minimum spot size and divergence angle measurements.
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