研究目的
To observe the gain value of medium glass by optical pumping at 805 nm and to develop an optical pumping system based on an 805 nm laser diode as a photo-pumped source.
研究成果
The optical pumping experiment based on an 808 nm CW laser diode as a pumping source and Nd3+ doped borate glass as a laser medium was successfully demonstrated. The maximum output laser was achieved by the glass with 1.0 mol% Nd3+ concentration, showing the potential of these glasses for near infra-red laser applications. The optical gain consistently increased during and after the optical pumping of 900 mW for the glass with 0.5 mol% Nd3+ concentration.
研究不足
The study is limited to the observation of optical gain in Nd3+ doped borate glasses under specific conditions of optical pumping. The concentration quenching effect beyond 1.0 mol% Nd3+ concentration was noted, which could limit the efficiency of the glass medium at higher concentrations.
1：Experimental Design and Method Selection:
The optical pumping system was designed based on an 805 nm laser diode as the photo-pumped source. A 1064 nm laser was used as a reference source passed through a laser glass medium.
2：Sample Selection and Data Sources:
Laser glass medium was synthesized from chemical compositions of (65-x)B2O3-15Na2O-10PbO-5ZnO-5Li2O-xNd2O3 (with x =
3：05, 1, 5, 0, 0 and 0). List of Experimental Equipment and Materials:
Continuous wave 805 nm LD with a maximum output power of 1 W, mirrors M1 and M2, photodiodes PD1 and PD2, SR-810 lock-in amplifier.
4：Experimental Procedures and Operational Workflow:
The glass medium was placed between two mirrors M1 and M
5：The output signal was connected to a photodiode (PD1) and displayed in SR-810 lock-in amplifier. PD2 was used to detect the 1064 nm laser source as a reference signal. Data Analysis Methods:
The output voltage was converted to optical gain in dB. The emission spectra and luminescence lifetime were analyzed.
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