Highly sensitive self-mixing measurement of Brillouin scattering with a laser-diode-pumped microchip LiNdP_4O_12 laser

Abstract

Brillouin scattering has been measured with a high degree of sensitivity by a system built around a laser-diode-pumped microchip LiNdP(4)O(12) laser. An efficient self-mixing modulation effect that is due to the interference between a lasing field and a weak field fed back from an acousto-optic modulator by means of a phase-conjugate reflection was used. Laser-Doppler velocimetry that can discriminate the direction of motion has been demonstrated.

Mixed Alkali Neodymium Orthoborates: K9Li3Nd3(BO3)7 and A2LiNd(BO3)2 (A = Rb, Cs)

“…Nd 3+ ‐doped orthophosphate YPO 4 and fluorite SrF 2 are increasingly appealing since these compounds are found to be suitable for in‐vivo imaging with high contrast in the biological transparent window 6,7. In addition, several neodymium phosphates such as NdP 5 O 14 , LiNdP 4 O 12 , and K 3 Nd(PO 4 ) 2 were developed as microchip laser gain media and applied in data storage and laser displays 8,9…”

Analysis of molecular dynamics of colloidal particles in transported dilute samples by self-mixing laser Doppler velocimetry

“…In one of the LDV techniques, self-mixing LDV, the laser itself is intensity modulated by beat signals generated by the interference between a lasing field and a frequency-shifted scattered field reinjected into the laser [2][3][4]. Thus, the velocity of the target can be obtained from the observation of the intensity-modulated laser light.…”

“…The power spectrum of the modulated wave induced by the motion of colloidal particles in the dilute sample is measured by self-mixing LDV. If information on a dilute sample (for example, the diffusion constant of the particles) can be obtained from the power spectrum, then this system can be applied to the product inspection of medicine and cosmetics in glass bottles on a production line in real time using a self-mixing laser with high optical sensitivity [2][3][4]. We previously conjectured that such a system could be treated as a flowing Brownian motion system in which particles undergoing Brownian motion are transported by uniform flow [8][9][10].…”

Modes competition in a dual modes HeNe laser with optical feedback

“…The optical feedback characteristics have been studied in different kinds of lasers such as the gas lasers [1][2][3][4][5][6], the microchip solid lasers [7][8][9], and the semiconductor lasers [10][11][12][13]. Some applications for velocimeter [1][2][3]7,9,12], ranging, displacement [4][5][6]10,11], or imaging [14] have been developed based on the optical feedback characteristics. Theory models have also been created to explain the optical feedback phenomena [4,5,10,[15][16][17][18].…”