Abstract
We have demonstrated a laser in which the frequency shift due to small cavity fluctuations is far less than what would be expected from a conventional laser. The factor of sensitivity suppression is inferred to be equal to the effective group index experienced by the laser, implying that this laser is subluminal. We have observed a suppression factor as high as 663. Such a laser is highly self-stabilized compared to a conventional laser, and is expected to have a far smaller Schawlow-Townes linewidth. As a result, this laser may have potentially significant applications in the fields of high-precision optical metrology and passive frequency stabilization.
Highlights
Recent studies [1,2,3,4,5,6,7,8] have shown that the resonant frequency of a cavity is less sensitive to change in length when a slow light medium is placed inside the cavity
We have demonstrated a laser in which the frequency shift due to small cavity fluctuations is far less than what would be expected from a conventional laser
We have observed a suppression factor as high as 663. Such a laser is highly self-stabilized compared to a conventional laser, and is expected to have a far smaller Schawlow-Townes linewidth
Summary
Recent studies [1,2,3,4,5,6,7,8] have shown that the resonant frequency of a cavity is less sensitive to change in length when a slow light medium is placed inside the cavity. The spectral sensitivity, defined as the shift in resonant frequency as a function of cavity length change, is reduced by a factor of ng, the group index, which is defined as the ratio between the vacuum speed of light and vg. Since very high values of ng can be achieved experimentally, an SLL can be an ultra-stable laser Another interesting and potentially very important aspect of the SLL is that its quantum noise limited linewidth (known as the Schawlow-Townes linewidth, or STL) is expected to be smaller than that of a conventional laser by a factor of ng. Another interesting and potentially very important aspect of the SLL is that its quantum noise limited linewidth (known as the Schawlow-Townes linewidth, or STL) is expected to be smaller than that of a conventional laser by a factor of ng2 This conclusion is based on the argument that the energy flow rate is proportional to vg [9]. Such an SLL may find important applications in precision metrology and laser stabilization
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