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    We developed a tunable laser for spectroscopy, achieving 1W output and suppressing amplified stimulated emission. This tunable external cavity tapered amplifier laser (ECTAL) system enables new measurements of iodine molecules and muonic hydrogen.

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    Area of Science:

    • Atomic, Molecular and Chemical Physics
    • Optics and Photonics

    Background:

    • External cavity diode lasers are crucial for precise spectroscopic measurements.
    • Tunable lasers are essential for probing molecular transitions near dissociation limits and for advanced applications like injection seeding.

    Purpose of the Study:

    • To demonstrate a tunable external cavity tapered amplifier laser (ECTAL) with a narrowband interference filter.
    • To investigate the laser's performance in terms of tunability, output power, and amplified stimulated emission suppression.
    • To apply the ECTAL for high-resolution spectroscopy of iodine molecules and for injection seeding of a disk laser for muonic hydrogen studies.

    Main Methods:

    • Utilized a narrowband interference filter as the wavelength discriminator in an external cavity tapered amplifier laser (ECTAL) setup.
    • Performed tunable spectroscopy on the R(39) 57-0 line of iodine molecules near the dissociation limit.
    • Employed the ECTAL for injection seeding of a 1030 nm disk laser and stabilized it using iodine Doppler-free spectroscopy.

    Main Results:

    • Achieved a tunable laser system operating from 1006 to 1031 nm with approximately 1 W output power.
    • Suppressed amplified stimulated emission to below 32 dB.
    • Measured the linewidth of the a1 component of the R(39) 57-0 iodine line at ~2 MHz and determined the pressure-broadening coefficient to be ~156 kHz/Pa.
    • Successfully stabilized the ECTAL to the P(26) 43-0 iodine line for 48 hours for disk laser injection seeding.

    Conclusions:

    • The developed ECTAL offers a versatile and stable platform for high-resolution spectroscopy.
    • This laser system opens new avenues for studying molecular transitions near dissociation limits and advancing precision measurements in atomic physics.
    • The successful stabilization and application in injection seeding highlight the potential of this tunable laser for complex optical experiments.