RETRACTED — Studies on the effect of instability of divergence, pointing and amplitude of green and yellow radiation pulses of copper vapour laser in second harmonic and sum frequency conversion

2013 ◽  
Vol 45 ◽  
pp. 428-434
Author(s):  
Om Prakash ◽  
Ramakanta Mahakud ◽  
Shankar V. Nakhe ◽  
Sudhir K. Dixit
Keyword(s):  
Frequency Conversion ◽  
Second Harmonic ◽  
Copper Vapour Laser ◽  
Sum Frequency

scholarly journals Discretely Tunable Multiwavelength Visible Laser Based on Cascaded Frequency Conversion Processes

2020 ◽  
Vol 10 (23) ◽  
pp. 8608
Author(s):  
Xinlin Lv ◽  
Junchi Chen ◽  
Yujie Peng ◽  
Zhiyuan Huang ◽  
Yingbin Long ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Frequency Conversion ◽  
Second Harmonic ◽  
Raman Laser ◽  
Maximum Energy ◽  
Laser Oscillator ◽  
Sum Frequency ◽  
Wide Range ◽  
Visible Laser ◽  
Visible Wavelengths

We demonstrate a discretely tunable multiwavelength visible laser through second harmonic generation (SHG) and sum frequency generation (SFG) of multiorder Stokes lasers generated from an external Raman laser oscillator. The Raman laser oscillator, driven by a 1064 nm laser with an energy of 120 mJ, is based on a cascade of Ba(NO3)2 and two axial orthogonal KGd(WO4)2 crystals. Through adjusting the angle of the SHG/SFG crystal, we obtain 16 visible wavelengths with a wide range from 579.5–658.4 nm. In addition, we investigate the output energy and conversion efficiency of the resulting laser with various phase-matching angles. We show that the maximum energy of the visible laser is 8.87 mJ with five wavelengths, and the corresponding total conversion efficiency is 7.4%. These experimental results demonstrate a practical and effective method of generating a discretely tunable multiwavelength visible laser.

OPTICAL NONLINEARITY VIA PHONONS AS AN INTERMEDIARY

2001 ◽  
Vol 10 (01) ◽  
pp. 65-77 ◽  
Author(s):  
OU FA ◽  
HE MINGGAO ◽  
WU FUGEN
Keyword(s):  
Second Harmonic ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Saturation Phenomenon ◽  
Sum Frequency ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Threshold Phenomenon ◽  
Anti Stokes ◽  
The Given

A new model to describe the origin of optical nonlinearity is presented. In this model, the interaction between light and medium is reduced to the coupling of photons with phonons, which occurs in the crystal lattice vibrating anharmonically. Then the optical nonlinearity originates from the nonlinear photon–phonon coupling or the interaction among phonons themselves. In this paper, more attention is drawn to the latter. By the given model, (1) degenerate and (2) nondegenerate parametric oscillations, (3) Stokes and (4) anti-Stokes Raman scattering, (5) sum-frequency and (6) second harmonic generation and (7) two-photon absorption are dealt with systematically and quantum-mechanically. The results of theoretical analysis show that the effects (1)–(4) are associated with threshold phenomenon, whereas the effects (5)–(7) with the saturation phenomenon.

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