研究目的
Investigating the feasibility and performance of directly diode-pumped, Kerr-lens mode-locked Cr:ZnSe oscillators as an alternative to fiber-pumped systems for generating few-cycle pulses in the mid-infrared spectral range.
研究成果
The directly diode-pumped, Kerr-lens mode-locked Cr:ZnSe oscillator demonstrated highly promising low-noise performance and the potential to become a new workhorse among ultrashort laser sources in the 2-3 μm region, offering an affordable alternative to fiber-pumped systems.
研究不足
The study is limited by the current output power of laser diodes and the complexity of controlling the highly-divergent and anisotropic diode output beam characteristics.
1：Experimental Design and Method Selection:
The study utilized an asymmetric X-folded cavity with a Cr:ZnSe gain element, pumped by an InP C-Mount laser diode. Kerr-lens mode-locking was initiated by adjusting the group delay dispersion and third-order dispersion with Brewster-oriented material and dispersive mirrors.
2：Sample Selection and Data Sources:
A 5 mm long polycrystalline Cr:ZnSe gain element was used.
3：List of Experimental Equipment and Materials:
InP C-Mount laser diode (1.65 μm), aspheric and cylindrical lenses, Brewster-oriented material (3 mm YAG, 3 mm Sapphire), third-order dispersive mirror, and a self-built second-harmonic FROG device.
4：65 μm), aspheric and cylindrical lenses, Brewster-oriented material (3 mm YAG, 3 mm Sapphire), third-order dispersive mirror, and a self-built second-harmonic FROG device.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The diode output beam was controlled with lenses to achieve a focal spot in the gain crystal. Mode-locking was achieved by adjusting dispersion, and pulse durations were measured with the FROG device.
5：Data Analysis Methods:
The noise performance and pulse durations were analyzed to evaluate the oscillator's performance.
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