Watt-level single-frequency tapered amplifier laser using a narrowband interference filter

Abstract

We demonstrate a tunable external cavity tapered amplifier laser (ECTAL) using a narrowband interference filter as the wavelength discriminator. The laser is tunable over a wavelength range from 1006 to 1031 nm with an output power of ∼1 W. The amplified stimulated emission of the laser system is suppressed to better than 32 dB. The laser is applied to study the saturation spectroscopy on the R(39) 57-0 line of iodine molecule, which, to our best knowledge, is the first measurement of this line close to the dissociation limit. The linewidth of the a component is ∼2 MHz at the iodine vapor pressure of ∼11 Pa, and the pressure-broadening coefficient is ∼156 kHz/Pa. This laser system is also used for the injection seeding of a 1030 nm disk laser to perform hyperfine spectroscopy of muonic hydrogen. To reach a satisfactory condition for disk laser use, the ECTAL is successfully stabilized to the iodine Doppler-free spectroscopy of the P(26) 43-0 line near 515 nm, with continuous locking over 48 h.

Inverted-ladder-type optical excitation of potassium Rydberg states with hot and cold ensembles

“…The inverted scheme is particularly suitable for the future realization of multiqubit gates [1]. The coupling laser system at the wavelength can benefit from the well-developed power amplifier with a power up to watt level in the near-infrared range [26]. Towards the heteronuclear Rydberg atoms interaction applications, such a high-power laser also acts as an optical dipole trap for the ultracold atomic ensembles of K and Rb.…”

Micro-integrated high-power narrow-linewidth external-cavity tapered diode laser at 762 nm for daylight imaging

“…Diffractionlimited high-power diode lasers have been available from the red to the near infrared spectral range since the introduction of tapered diode lasers [5][6][7]. Narrow-linewidth emission of these high power tapered devices have been achieved by either etching a grating in the semiconductor material, such as distributed feedback (DFB)/distributed Bragg reflector (DBR) feedback technique [4,6,8], or using a master-oscillator power amplifier (MOPA) layout [9,10], or with an external cavity feedback with a frequency selective element [11,12]. The DFB/DBR techniques are well developed from 900 to 1200 nm; very recently, this technique has been applied to tapered diode lasers with wavelengths down to 783 nm.…”

“…For laser-based daylight imaging/sensing application, the laser is usually operated in pulsed mode [2][3][4]. Normally, high power narrow-linewidth tapered diode lasers and laser systems are operated in continuous wave (CW) mode [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. However, they are also well operated in pulsed mode, and in most cases, they are operated in quasi-continuous wave (QCW) condition, i.e., the duty cycle is less than a few percent and the thermal effect can be reduced significantly.…”

Micro-integrated high-power narrow-linewidth external-cavity tapered diode laser at 808 nm

“…The second approach is preferred since the additional single-mode master oscillator is not needed. In that approach, different frequency-selective elements are implemented to achieve a narrowlinewidth tapered diode laser system, e.g., bulk diffraction gratings [11,13], fiber Bragg gratings [9,14], narrowband interference filters [15], phase conjugate mirrors [10] and volume Bragg gratings (VBGs) [12,16 ]. VBGs based on photosensitive glasses are key elements for achieving a compact and relatively temperature insensitive wavelength-stabilized narrow-linewidth diode laser [17].…”