研究目的
To investigate thermal lensing and the 'population lens' effect in red-diode-pumped Alexandrite lasers and to observe stable self-Q-switching in an Alexandrite laser cavity.
研究成果
The study provides detailed insight into thermal lensing in Alexandrite, attributing differences in lensing power under lasing and non-lasing conditions to the 'population lens' effect. It also observes stable self-Q-switching in an Alexandrite laser cavity, with the highest repetition rate reported for any SQS Alexandrite laser, attributable to the fast dynamics of the population lens effect.
研究不足
The study is limited by the current understanding and management of thermal lensing in Alexandrite lasers. The quadratic rise in thermal lens due to pump excited state absorption is not fully accounted for in the experimental results.
1：Experimental Design and Method Selection:
The study involves experimental and finite element analysis (FEA) to investigate thermal lensing in a red-diode-pumped Alexandrite laser. A probe beam is used to measure thermal lens power and aberrations.
2：Sample Selection and Data Sources:
An Alexandrite rod is end-pumped with a polarised fiber-coupled red-diode laser. Data is collected under non-lasing and lasing conditions.
3：List of Experimental Equipment and Materials:
Alexandrite rod, fiber-coupled red-diode laser, plane dichroic back mirror, output coupler, Shack-Hartmann wavefront sensor.
4：Experimental Procedures and Operational Workflow:
The pump is focused through a back mirror, and a probe beam is directed through the crystal to a wavefront sensor. Measurements are taken under varying conditions.
5：Data Analysis Methods:
FEA modelling is used to determine the fractional heating factor, and analytic solutions are considered for pump excited state absorption.
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