Operating conditions of continuous wave simultaneous dual wavelength laser in neodymium host crystals

Abstract

In consideration of the hole-burning effects, based on the single longitudinal mode rate equation, the operating condition of continuous wave simultaneous dual wavelength laser (SDWL) in neodymium host crystals is studied. The relationship between the operating threshold of SDWL and thresholds of the single wavelength laser for both wavelengths is ascertained. The effect of multilongitudinal modes on the operation result has been discussed qualitatively. Taking Nd:YAlO3 crystal as an example, the experimental results agree well with our theoretical analysis.

Nd:YLF laser at cryogenic temperature with orthogonally polarized simultaneous emission at 1047 nm and 1053 nm

“…Lasers with simultaneous multiple-wavelength emissions have been widely used in holography, medical treatment or double-wavelength lidar, etc [1][2][3][4]. The Nd:YLF crystal is a uniaxial crystal that can generate lasers with emission wavelengths at 1047 nm and 1053 nm corresponding to π polarization and σ polarization, respectively [5,6].…”

High power Nd:YAG lasers operating at 1.3μm wave band

“…[15], the possibilities of simultaneous multiple wavelength lasing in various Nd host crystals have been analyzed first, and the simultaneous multiple wavelength lasing in a CW Nd:YAP laser at both 1.079 lm and 1.341 lm has been achieved for the first time. Further, Shen studied the operating condition of continuous wave simultaneous dual wavelength laser (SDWL) in neodymium host crystal based on the single longitudinal mode rat equation after considering the spatial hole-burning effects, and came to a conclusion that the thresholds of both lasers with different wavelengths are required to satisfy the following inequality in order to realize SDWL operation [16]:…”

“…Shen et al considered the situation of P in = 1.3 P th1 for operating condition of continuous wave SDWL [16], but the pump energy was set to be nearly twice that of the threshold energy in the computational model of Q-switch Nd:YAlO 3 dual wavelength laser in Ref. [17].…”

“…[6], a Nd:YAG rod was pumped by a laser diode-sidepumping module, and as high as 131 W and 109 W CW lasers at 1319 nm single wavelength and 1319 nm and 1338 nm simultaneous dual wavelength, respectively, were achieved at the pumping power of 555 W. Flash-lamppumped or diode-pumped, pulsed or CW multi-wavelength laser operations in Nd 3+ doped materials, such as Nd:YAG [4,[6][7][8], Nd:YLF [9], Nd:YVO 4 [10,11], (Er, Nd):YAG [12], (Ho, Nd):YAG [13], Nd:GdVO 4 [14], and Nd:YAP [15,16], have been previously reported. In this paper, through calculating the simultaneous dual wavelength threshold condition, coating the laser cavity at different wavelengths precisely and increasing Nd 3+ ions doping level and the length of Nd:YAG rod, we successfully developed three types of high power 1.3 lm wave band Nd:YAG quasi continuous wave (QCW) lasers pumped with a Kr-lamp.…”

All-solid-state red and green laser by temperature tuning

“…In comparison with these two lines, another line at 914 nm, corresponding to the 4 F 3/2 -4 F 9/2 transition, is more difficult to obtain because of the oscillation with a rather low gain. The key problem in optimizing the dual-wavelength lasing operation is to set all the parameters of the linear cavity such as the reflectivity values of the output couplers to balance the gain curves for each of the output wavelengths [3,6,9,10]. Henderson [5] has proposed a configuration of a Q-switch simultaneous dualwavelength with a Y-type cavity and an offset of the open times of the Q-switches so that the laser can have a relatively good temporal and spatial overlap for the two different wavelengths.…”