63 W wing-pumped Tm:YAG single-crystal fiber laser

Abstract

We present a high-power continuous-wave (CW) Tm:YAG single-crystal fiber (SCF) laser wing-pumped by laser diodes at 791 nm. A maximum output power of 63.3 W is achieved at ∼ 2.01 µm, corresponding to a slope efficiency of 34.2%. This is, to the best of our knowledge, the highest power obtained from the SCF laser in the 2 µm spectral range. In addition to the wing pumping scheme, the large surface-to-volume ratio of such fiber-geometry crystalline rod with diffusion-bonded undoped YAG end caps are benefited for the spatial uniform distribution of pump intensity and thermal load, and thus improving the power scalability.

High-efficiency tandem Ho:YAG single-crystal fiber laser delivering more than 100 W output power

“…However, there have been relatively few studies on high-power SCF lasers in the 2-μm spectral range to date. Most recently, we have reported on the wing-pumped Tm:YAG SCF laser delivering 63 W output power at 2.01-μm [37]. In terms of lasers based on Ho:YAG SCFs, the Ho:YAG SCF fabricated by laser heated pedestal growth (LHPG) method was reported for the first time at 2.09-μm, and a quasi-CW output power of 23.5 W was achieved under pulsed pumping (10 Hz repetition rate, 50% duty cycle), while an output power roll-off at 10 W was observed due to thermal issues under CW pumping [38].…”

Computational Imaging Encryption with a Steganographic and Holographic Authentication Strategy

“…[ 18 ] Furthermore, these computational methods have made substantial contributions to optical information security by enhancing system security and increasing the flexibility of optical systems. [ 19–38 ] Among these advancements, computational holography, particularly computer‐generated hologram (CGH), has stood out for its remarkable capability to generate nearly arbitrary wavefronts. [ 19–33 ] The simplicity of CGH's reconstruction process through optical diffraction or Fourier transform offers unique advantages in image encryption.…”

“…[ 19–38 ] Among these advancements, computational holography, particularly computer‐generated hologram (CGH), has stood out for its remarkable capability to generate nearly arbitrary wavefronts. [ 19–33 ] The simplicity of CGH's reconstruction process through optical diffraction or Fourier transform offers unique advantages in image encryption. Researchers have conducted experiments and proposed innovative approaches to utilize CGH for image encryption and authentication.…”