Continuous-wave Raman generation in a diode-pumped Nd3+:KGd(WO4)2 laser.

Area of Science:

• Laser physics
• Nonlinear optics
• Solid-state materials

Background:

• Continuous-wave (CW) Raman lasers offer unique spectral properties for various applications.
• Compact solid-state laser systems are desirable for practical implementation.
• Diode laser pumping provides an efficient and scalable energy source.

Purpose of the Study:

• To demonstrate CW Raman generation in a compact solid-state laser.
• To investigate the characteristics of stimulated Raman scattering (SRS) in a Nd3+:KGd(WO4)2 crystal.
• To analyze the Raman threshold and generation dynamics.

Main Methods:

• Utilized a compact solid-state laser cavity containing a Nd3+:KGd(WO4)2 crystal.
• Employed a multimode diode laser for pumping at 1.067 microm.
• Measured the Raman threshold and output power at the Stokes wavelength (1.181 microm).

Main Results:

• Achieved continuous-wave Raman generation with Stokes radiation at 1.181 microm.
• Determined the Raman threshold to be 1.15 W of diode laser power.
• Obtained a maximum output power of 54 mW at the Stokes wavelength.
• Observed an anomalous delay in Raman generation onset and a dependence of the Raman threshold on laser action time.

Conclusions:

• Demonstrated the feasibility of CW Raman generation in a compact diode-pumped solid-state laser system.
• Highlighted the unique dynamics of Raman generation, including delayed onset and complex threshold behavior.
• The results suggest potential for developing compact and efficient solid-state Raman sources.