Single-frequency 620  nm diamond laser at high power, stabilized via harmonic self-suppression and spatial-hole-burning-free gain

Bai²,

et al. 2021

Front. Phys.

Self Cite

Diamond has a broad spectral transmission range (>0.2 μm) and the largest Raman frequency shift (1,332 cm−1) among known Raman crystals. Hence, the diamond Raman laser has the potential to achieve lasing in the long-wave infrared (LWIR) range, which is difficult to reach via other crystalline lasers. Here, we report a new approach to achieve LWIR output using diamond Raman conversion and provide the corresponding analysis model and simulation results. The conversion efficiency is analyzed as function of the pump waist size, output-coupler transmission, and crystal length, at constant pump power. The maximum output power at which a diamond of relatively large size can be operated without damage is predicted. This study paves a way for high-power LWIR lasing in diamond.

Section: Discussionmentioning

confidence: 96%

Numerical Simulation of Long-Wave Infrared Generation Using an External Cavity Diamond Raman Laser

Bai²,

et al. 2021

Front. Phys.

Self Cite

“…Whereas increasing cavity Q is likely to increase stability in the present device, there are fundamental advantages to reduce Q. For example, it was recently shown that stable SLM operation from standing-wave diamond laser can be achieved using multimode pumps [30], which would be incompatible with a pump resonant scheme. This result highlights a potential route to stabilized cavities through a cavity locking mechanism based on the resonant Stokes field (for example, using a reference cavity or by injection locking with a low-power narrowband laser).…”

Section: Analysis and Discussionmentioning

confidence: 99%

Single-longitudinal-mode diamond laser stabilization using polarization-dependent Raman gain

et al. 2019

Self Cite

We report a novel cavity feedback mechanism for stabilizing single-longitudinalmode (SLM) operation of diamond Raman lasers. Polarization-dependent Raman gain and in-grown stress birefringence in diamond were investigated as sources for Hänsch-Couillaud-type locking signals. The power range of SLM operation increased from 2.1 W to 7.2 W, compared to the free-running laser, for a simple standing-wave laser cavity without frequency-selective elements. Methods for further increasing power range and frequency stability are discussed.

“…The mode competition provided by harmonic mixing can greatly improve the mode stability owing to the advantages of having a gain medium without spatial hole burning. In 2019, Yang et al first realized a quasi-CW SLM operation in an external cavity DRL, pumped by a multimode 1064 nm Nd:YAG laser with a linewidth of 3.3 GHz [73] . Without mode competition, SLM operation at 1240 nm was limited to 6.5 W. Including a LiB 3 O 5 (LBO) crystal for second harmonic generation in the cavity increased the maximum SLM power to 11.8 W at 1240 nm and 38 W at 620 nm, and the power instability was less than 10%.…”

Section: Slmmentioning

confidence: 99%

Diamond Raman laser: a promising high-beam-quality and low-thermal-effect laser

Ding

Bai

et al. 2021

High Pow Laser Sci Eng

Self Cite

Stimulated Raman-scattering-based lasers provide an effective way to achieve wavelength conversion. However, thermally induced beam degradation is a notorious obstacle to power scaling and it also limits the applicable range where high output beam quality is needed. Considerable research efforts have been devoted to developing Raman materials, with diamond being a promising candidate to acquire wavelength-versatile, high-power, and high-quality output beam owing to its excellent thermal properties, high Raman gain coefficient, and wide transmission range. The diamond Raman resonator is usually designed as an external-cavity pumped structure, which can easily eliminate the negative thermal effects of intracavity laser crystals. Diamond Raman converters also provide an approach to improve the beam quality owing to the Raman cleanup effect. This review outlines the research status of diamond Raman lasers, including beam quality optimization, Raman conversion, thermal effects, and prospects for future development directions.