A frequency-doubled Nd:YAG/KTP laser at 561 nm with diode side-pumping

Abstract

An intracavity KTiOPO 4 (KTP) frequency doubling laser emitting at 561 nm is achieved within a diode side-pumped acousto-optically Q-switched Nd:YAG laser. A compact convex-flat straight cavity is employed to achieve the compact configuration, where coatings are specially designed to suppress unwanted lines. At the pump power of 147 W and the pulse repetition rate of 10 kHz, the output power of 8.1 W was obtained at 561 nm. The corresponding optical-to-optical conversion efficiency is 5.5%. The pulse width of a 561 nm wave is 210 ns. The M 2 factors are measured to be 15.5 and 17.5 in the horizontal and vertical directions respectively.

High stability and low noise laser-diode end-pumped Nd: YAG ceramic passively Q-switched laser at 1123 nm based on a Ti3C2T x -PVA saturable absorber

“…[4][5][6] Additionally, the 561 nm yellow-green laser generated by the frequency doubling 1123 nm is an ideal laser source for dermatology, bioluminescence detection, and holographic storage. [7][8][9] However, the absence of active frequency selection and filtering results in significant output noise in the 1123 nm pulsed laser. This is due to the fact that the Nd: YAG crystal or Nd: YAG ceramic generates three spectral lights at 1112 nm, 1116 nm and 1123 nm through stimulated emission.…”

Diode pumped Nd:YVO4/LBO/Ba(NO3)2 Raman laser at 563 nm

“…Laser radiation in the yellow-green spectral range can be obtained from tunable solid-state dye lasers [3,4] or using nonlinear conversion, namely, second harmonic (SH) generation [5][6][7][8][9] and stimulated Raman scattering followed by sum frequency (SF) generation [10][11][12][13][14]. In spite of high output powers, solid-state dye lasers remain impractical due to degradation of the dye [4].…”

“…In 2009, Yao et al [5] obtained laser radiation with a wavelength of 561 nm using a diode-pumped cw Nd:YAG laser operating at the laser transition to a higher Stark level with a wavelength of 1123 nm and intra-cavity SH generation in an LBO crystal. The low value of the effective laser emission cross section of this transition required specially designed dichroic mirrors or complex cavities [5][6][7][8]. Hofmann et al [9] proposed to use a specially designed distributed Bragg reflector for this purpose.…”

Efficient yellow-green light generation at 561 nm by frequency-doubling of a QD-FBG laser diode in a PPLN waveguide

“…Second harmonic generation (SHG) at 561 nm using an Nd:YAG laser and a KTA crystal with output power of 55 mW [13] and 2.6 W [14], and corresponding conversion efficiency of 23% and 8.7%, has also been reported. Output power of 0.5 W [7] and 8.1 W [15], and optical-to optical efficiency of 17.9% and 5.5%, respectively, from frequency doubled Nd:YAG/KTP lasers at 561 nm has been recently obtained. Up to 570 mW of output power at 561 nm with an optical-to-optical conversion efficiency of 3.3% has also been achieved from an Nd:KGdWO 4 2 self-Raman laser by intracavity sum-frequency mixing of fundamental and first-Stokes wavelengths in an LBO crystal [16].…”