Abstract
Without exploiting any frequency selective elements, we have realized a highly integrated, single-mode, narrow-linewidth Nd:YAG 1064 nm laser, which is end-pumped by the 808.6 nm diode laser in an integrated invar cavity. It turns out that each 1064 nm laser achieves a most probable linewidth of 8.5 kHz by beating between two identical laser systems. The output power of the 1064 nm laser increases steadily as the 808.6 nm pump power is raised, which can be up to 350 mW. Moreover, the resonant wavelength of cavity grows continuously in a certain crystal temperature range. Such a 1064 nm laser will be frequency stabilized to an ultrastable cavity by using the Pound-Drever-Hall technique and used as the good cavity laser to lock the main cavity length of 1064/1470 nm good-bad cavity dual-wavelength active optical clock.
Highlights
Favourable properties, such as high power, moderate size, and intrinsically high stability,1 make the single-mode 1064 nm Nd:YAG laser a prominent oscillator in optical frequency standards
Combined with the PDH technique, such a 1064 nm good cavity laser will be locked to an ultrastable cavity whose linewidth is narrower than 1 Hz35–37 to stabilize the main cavity length of the dual-wavelength active optical clock
To realize a 1470 nm bad cavity active optical frequency standard with ultra-narrow linewidth, the 1064 nm good cavity laser is servo locked to an ultrastable cavity with the PDH technique to stabilize the main cavity length
Summary
Favourable properties, such as high power, moderate size, and intrinsically high stability, make the single-mode 1064 nm Nd:YAG laser a prominent oscillator in optical frequency standards. By the second harmonics generation (SHG) method, a single-mode 1064 nm laser is used as a laser source to generate the 532 nm laser which is recommended for the realization of metre.2,3 It is an excellent signal for optical parametric amplifiers in quantum optical experiments.. The 1064 nm good cavity laser will be servo locked to an ultrastable cavity with the Pound-Drever-Hall (PDH) technique to stabilize the main cavity length of a dual-wavelength active optical clock. Combined with the PDH technique, such a 1064 nm good cavity laser will be locked to an ultrastable cavity whose linewidth is narrower than 1 Hz35–37 to stabilize the main cavity length of the dual-wavelength active optical clock. Experiments have demonstrated that a laser diode endpumped Nd:YAG crystal placed in the integrated main cavity is the best way to realize the good cavity laser in a dualwavelength active optical clock. Dual-wavelength scheme is feasible since we have achieved the 1064 nm and 1470 nm lasers’ simultaneous output from one cavity, and in this study, we focus on the characteristic and application fields of the 1064 nm good cavity laser
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